Updated on 2024/09/20

写真a

 
NISHIKAWARA Masahito
 
Organization
Graduate School of Engineering Energy Engineering 3 Associate professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Energy Science and Engineering
Title
Associate professor
Contact information
メールアドレス
External link

Research Interests 7

  1. Advanced thermal energy transport

  2. Spacecraft thermal control engineering

  3. Electrohydrodynamics

  4. Heat Pipe

  5. Two-phase flow in porous media

  6. dielectrophoresis

  7. Loop Heat Pipe

Research Areas 3

  1. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

  2. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

  3. Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Aerospace engineering

Research History 8

  1. Nagoya University   Department of Energy Engineering   Associate professor

    2024.4

      More details

    Country:Japan

    researchmap

  2. 名古屋大学高等研究院   客員研究員(T-GExアソシエート)

    2022.6 - 2024.3

      More details

    Country:Japan

    researchmap

  3. Worcester Polytechnic Institute   Mechanical engineering department   Visiting researcher

    2019.6

      More details

    Country:United States

    researchmap

  4. JSPS Overseas Research Fellow

    2019.6 - 2021.9

      More details

    Country:Japan

    researchmap

  5. Toyohashi University of Technology   Graduate School of Engineering, Department of Mechanical Engineering   Assistant Professor

    2015.4 - 2024.3

      More details

    Country:Japan

    researchmap

  6. JSPS research fellowship   DC2

    2013.4 - 2015.3

      More details

    Country:Japan

    researchmap

  7. Visiting researcher in Institut de Mécanique des Fluides de Toulouse (IMFT)   Visiting researcher

    2013.1 - 2014.3

      More details

    Country:France

    researchmap

  8. 公益財団法人旭硝子奨学会 奨学生

    2012.4 - 2013.3

      More details

    Country:Japan

    researchmap

▼display all

Education 2

  1. Nagoya University   Graduate School of Engineering   Aerospace Engineering

    2010.4 - 2015.3

      More details

    Country: Japan

    researchmap

  2. Nagoya University   School of Engineering   Mechanical and Aerospace Engineering

    2006.4 - 2010.3

      More details

    Country: Japan

    researchmap

Professional Memberships 5

  1. 日本ヒートパイプ協会

      More details

  2. THE JAPAN FLUID POWER SYSTEM SOCIETY

      More details

  3. THE HEAT TRANSFER SOCIETY OF JAPAN

      More details

  4. THE JAPAN SOCIETY OF MECHANICAL ENGINEERS

      More details

  5. 静電気学会

      More details

Committee Memberships 11

  1. 21st International Conference on Flow Dynamics (ICFD2024)   Co-organizer, Two-Phase Thermal Control Technology (OS10)  

    2024.5 - 2024.11   

      More details

    Committee type:Academic society

    researchmap

  2. 日本伝熱学会   東海支部第3回若手研究会幹事  

    2024.3   

      More details

    Committee type:Academic society

    researchmap

  3. Thermal Science and Engineering Progress, Elsevier   Co-Guest Editor  

    2023.11   

      More details

    Committee type:Other

    Special Issue (Additive Manufacturing of Heat Transfer Materials and Applications)

    researchmap

  4. 日本伝熱学会   東海支部第2回若手研究会幹事  

    2023.3   

      More details

    Committee type:Academic society

    researchmap

  5. Joint 21st International Heat Pipe Conference and 15th International Heat Pipe Symposium @Melbourne   Session chair  

    2023.2   

      More details

    Committee type:Academic society

    researchmap

  6. 日本伝熱学会   第59回日本伝熱シンポジウム実行委員  

    2022.5   

      More details

    Committee type:Academic society

    researchmap

  7. 日本フルードパワーシステム学会   機能性流体FPSのフロンティア展開に関する研究委員会 委員  

    2022.4   

      More details

    Committee type:Academic society

    researchmap

  8. 日本伝熱学会   日本伝熱学会東海支部 幹事  

    2021.4   

      More details

    Committee type:Academic society

    researchmap

  9. 日本伝熱学会東海支部   幹事  

    2018.4 - 2019.3   

      More details

    Committee type:Academic society

    researchmap

  10. 第27回東海伝熱セミナー   セッション座長  

    2017.9   

      More details

    Committee type:Academic society

    researchmap

  11. 日本機械学会第22回 動力・エネルギー技術シンポジウム   実行委員  

    2017.6   

      More details

    Committee type:Academic society

    researchmap

▼display all

Awards 6

  1. George Grover Medal

    2023.2   International Heat Pipe Conference  

    Masahito Nishikawara

     More details

  2. 2022年度若手研究奨励賞

    2022.12   日本ヒートパイプ協会  

    西川原理仁

     More details

  3. Best Paper Award

    2021.10   11th JFPS International Symposium on Fluid Power  

    K. Okada, M. Nishikawara, H. Yokoyama, H. Yanada

     More details

  4. 奨励賞(研究)

    2017.4   日本機械学会  

    西川原 理仁

     More details

  5. マツダ研究助成奨励賞

    2015.10   公益財団法人マツダ財団  

    西川原 理仁

     More details

  6. 若手優秀講演フェロー賞

    2014.7   日本機械学会  

    西川原 理仁

     More details

▼display all

 

Papers 40

  1. Demonstration of heat switch function of loop heat pipe controlled by electrohydrodynamic conduction pump Reviewed

    Nishikawara M., Miyakita T., Seshimo G., Yokoyama H., Yanada H.

    Applied Thermal Engineering   Vol. 249   2024.7

     More details

    Language:English   Publisher:Applied Thermal Engineering  

    Loop heat pipes (LHPs) are attractive devices to cool electronic devices in spacecraft. The LHP operation must be shut down in some cases to avoid considerable reductions in the temperature of such electric devices. A new active technology capable of heat switching is developed for LHPs using an electrohydrodynamic (EHD) conduction pump that operates to facilitate liquid flow in the reverse direction against the normal LHP flow. To demonstrate our proposed approach, an EHD conduction pump with rod–ring electrodes was developed and evaluated to obtain generated pressure with varying applied voltages. The LHP with R134a as a working fluid was shut down successfully when a sufficiently high voltage was applied. The LHP shutdown continued until the EHD conduction pump was turned off. A comparison with a test in which a manually controlled mechanical valve caused the capillary limit showed that the EHD pump worked differently from the valve: the shutdown by the EHD pump involved a reverse flow. The consumed electric power for the EHD pump was 10–30 mW for 6–8 kV of applied voltage during the LHP shutdown. Furthermore, pressure loss through the EHD pump during normal LHP operation was approximately 0.5 % of the capillary pressure.

    DOI: 10.1016/j.applthermaleng.2024.123428

    Scopus

  2. Relationship between phase distribution and heat-transfer coefficient of loop heat pipe evaporator investigated by lateral observation of porous media Reviewed International journal

    Masahito Nishikawara, Shohei Tomita, Hiroshi Yokoyama, Hideki Yanada

    Applied Thermal Engineering   Vol. 236   page: 121524 - 121524   2024.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.applthermaleng.2023.121524

    Web of Science

    researchmap

  3. Pore network simulation of loop heat pipe evaporator with different pore size distribution Reviewed International journal

    Masahito Nishikawara

    International Journal of Heat and Mass Transfer   Vol. 218   page: 124739 - 124739   2024.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.ijheatmasstransfer.2023.124739

    Web of Science

    researchmap

  4. Numerical Study of Dielectric Fluid Bubble Behavior in Microchannel Evaporator in Presence of Diverging Electric Field Reviewed International coauthorship International journal

    Nishikawara, M; O'connor, NJ; Yagoobi, JS

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   Vol. 59 ( 2 ) page: 2413 - 2420   2023.3

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TIA.2022.3233558

    Web of Science

  5. Optimization of wick shape in a loop heat pipe for high heat transfer Reviewed International journal

    M. Nishikawara, H. Nagano

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   Vol. 104   page: 1083 - 1089   2017.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    This paper presents a method to optimize wick shape in the capillary evaporator of loop heat pipes and capillary pumped loops. The evaporator heat-transfer coefficient is maximized using only the length of a three-phase contact line (TPCL) within the case, wick, and grooves as a variable wick dimension. The heat-transfer coefficient is formulated taking the following two particular aspects into account. The heat-transfer coefficient initially increases with TPCL length. However, when TPCL becomes too long, the heat-transfer coefficient decreases because of a large pressure loss in the grooves. The proposed model is validated experimentally. Both the model and experiment show the heat-transfer coefficient reached a local maximum in terms of the TPCL length. It is concluded that wick shape can be optimized by just using the TPCL length. The effects of the material of an evaporator's case, wick, and working fluid are also discussed. (C) 2016 The Authors. Published by Elsevier Ltd.

    DOI: 10.1016/j.ijheatmasstransfer.2016.09.027

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0003-0090-6112

  6. Formation of unsaturated regions in the porous wick of a capillary evaporator Reviewed International coauthorship International journal

    M. Nishikawara, H. Nagano, L. Mottet, M. Prat

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   Vol. 89   page: 588 - 595   2015.10

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    The heat and mass transfer in a porous wick within a capillary evaporator were analyzed in three dimensions, using a pore network model to simulate immiscible liquid-vapor flow and phase changes in the capillary structure. Characteristics of the porous structure, such as pore radius distribution, permeability and porosity were obtained from measurements of an actual wick and were included in the calculations. Scenarios involving both a fully liquid-saturated and an unsaturated wick containing liquid and vapor were examined under steady state conditions. The location at which the initial vapor phase was generated was identified based on classical nucleation theory. The transition from a saturated to an unsaturated wick was assessed by modeling the distribution of the liquid-vapor interface, and the wicks were compared based on color 3D renderings of temperature and pressure distributions and meniscus curvatures. The maximum temperature of the unsaturated wick exceeded that of the saturated wick although the area of the liquid-vapor interface in the unsaturated wick was five times that in the saturated wick. Since a distribution of pore radii was considered in these calculations, the interface within the wick was not smooth but exhibited asperity. The distribution of meniscus curvatures in the unsaturated wick was much wider compared with the saturated wick. The results obtained in the case of an unsaturated wick demonstrated the occurrence of the heat pipe effect, induced by a distribution of capillary pressures. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2015.05.054

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0003-0090-6112

  7. Promotion of carbon dioxide adsorption using a zeolite-coated monolith with acoustic excitation Reviewed International journal

    YOKOYAMA Hiroshi, MOCHIZUKI Kenta, NISHIKAWARA Masahito

    Journal of Fluid Science and Technology   Vol. 19 ( 3 ) page: JFST0029 - JFST0029   2024.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>CO<sub>2</sub>-separation technology is required in various industrial plants to reduce CO<sub>2</sub> emissions. A method for promoting adsorption via acoustic excitation is proposed, and the effects of acoustic excitation on CO<sub>2</sub> physisorption are investigated using a monolith coated with zeolite. The monolith is placed in a flow duct, where a CO<sub>2</sub> + N<sub>2</sub> gas mixture is flowed and acoustic resonance occurs due to acoustic excitation by speakers. Observations show that the time required to achieve a certain amount of adsorption can be reduced. Moreover, the mass transfer coefficient estimated based on a linear driving-force model increases as acoustic excitation is intensified, which indicates the promotion of adsorption. In particular, the promotion is intensified when the monolith is placed at the anti-node of the velocity fluctuations of the acoustic resonance. The measured velocity field in the wake of a monolith cell shows flat and high velocity profiles occurring periodically under acoustic excitation, which indicates that high-velocity CO<sub>2</sub> gas flows near the cell wall in the monolith. Moreover, the effects of acoustic excitation on the CO<sub>2</sub> concentration field in a planar jet comprising a CO<sub>2</sub> + N<sub>2</sub> gas mixture are investigated using a background-oriented Schlieren method. The result shows varying distributions of CO<sub>2</sub> concentration with time under acoustic excitation, where the CO<sub>2</sub> concentration around the jet exit is indicated to become periodically larger compared with the baseline case without sound. This indicates the possibility of enhanced CO<sub>2</sub> concentration in the monolith with acoustic excitation, which can contribute to promotion of CO<sub>2</sub> adsorption.</p>

    DOI: 10.1299/jfst.2024jfst0029

    CiNii Research

  8. Effects of bubble content on the rotor behavior and characteristics of hydraulic pumps used for automatic transmissions Reviewed

    Hideki Yanada, Ryo Kojima, Haruka Terashima, Hiroshi Yokoyama, Masahito Nishikawara

    Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science     2024.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SAGE Publications  

    In automatic transmissions, hydraulic oil in the oil sump is strongly agitated by gears during operation; thus, the oil is mixed with great amounts of air. Air-mixed oil is sucked and discharged by a hydraulic pump to shift the gears. Although air bubbles mixed in the oil may affect the behavior of the rotors, driving torque, and discharge flow rate, they have hardly been measured. In this study, we measure them using a balanced vane pump and a gerotor pump used for automatic transmissions under varying air bubble contents and operating conditions. The experimental results revealed that the inclusion of air bubbles in the oil somewhat influenced the rotor behavior of both test pumps but it did not seem to increase the contact between the rotor and the surrounding stationary parts. Furthermore, as the bubble content increased, friction torque decreased to some degree, while discharge flow rate decreased to a great degree. This work proposed a new friction torque model, in which bubble content is included as a parameter, and the proposed model demonstrated relatively good agreement with the measured friction torque characteristics. The results also revealed that the rotor behavior and friction torque characteristic were mainly affected by bubble content and less so by bubble size.

    DOI: 10.1177/09544062241236086

    researchmap

    Other Link: http://journals.sagepub.com/doi/full-xml/10.1177/09544062241236086

  9. Fluid–acoustic interactions around an expanding pipe with orifice plates Reviewed

    Akitomo Fukuma, Manato Kawai, Nini Furukawa, Kenji Kawasaki, Ichiro Yamagiwa, Masahito Nishikawara, Hiroshi Yokoyama

    Physics of Fluids   Vol. 36 ( 3 )   2024.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/5.0193029

    Web of Science

    researchmap

  10. Visualization study of liquid-vapor phase displacement between wall and porous media in drainage process of two-phase loop Reviewed International journal

    M. Nishikawara, J. Matsuda, H. Yokoyama, H. Yanada

    International Journal of Thermal Sciences   Vol. 195   page: 108652 - 108652   2024.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.ijthermalsci.2023.108652

    researchmap

  11. Simulation of acoustic oscillatory flows around a curvature controlled by a plasma actuator Reviewed International journal

    Hiroshi Yokoyama, Katsuaki Yoza, Masahito Nishikawara, Hideki Yanada

    Applied Acoustics   Vol. 205   2023.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    In this study, simulations based on the three-dimensional compressible Navier–Stokes equations were conducted to clarify a control method with a plasma actuator to reduce the acoustic power loss in the oscillatory flow under acoustic excitation (acoustic oscillatory flow) in a curved duct. The acoustic power loss for the curved duct exceeds that for the straight duct, particularly at a high acoustic Reynolds number based on the amplitude of the velocity fluctuations in the duct. Flow control by a plasma actuator, which was installed near the curvature in the straight section, was applied to suppress the periodically occurring flow separation around the curvature, which leads to energy loss in the baseline flow. The plasma actuator was intermittently driven at the same frequency as the acoustic oscillatory flow. It was thus demonstrated in the present numerical simulations that the acoustic power loss around the curvature was reduced by the flow control with the plasma actuator. Furthermore, efficient control conditions for the number of plasma actuators and the driving voltage are discussed considering the power consumption of the plasma actuator, although the power efficiency of the control needs to be improved for actual application. Moreover, the relatively effective intermittent control conditions of the phase and duty ratio for the reduction of acoustic power loss are presented with the predicted flow fields around the curvature.

    DOI: 10.1016/j.apacoust.2023.109274

    Web of Science

    Scopus

    researchmap

  12. Wicking characteristics of porous media using short copper micro/nanofibers Reviewed International journal

    Masahito Nishikawara, Toshihiro Sako, Hiroshi Yokoyama, Hideki Yanada

    International Journal of Heat and Mass Transfer   Vol. 195   page: 123137 - 123137   2022.10

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.ijheatmasstransfer.2022.123137

    Web of Science

    researchmap

  13. Flow fields around an axial fan with acoustic resonance in a duct Reviewed

    Tomoaki KANEKO, Hiroshi YOKOYAMA, Mitsuru SATO, Masahito NISHIKAWARA, Hideki YANADA

    Transactions of the JSME   Vol. 88 ( 910 ) page: 22-00044-1 - 22-00044-12   2022.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    For a small axial fan in a duct, the effects of acoustic resonance occurring in the duct on the flow around the fan are focused on. To clarify the condition for the intense acoustic resonance, the effects of the rotational speed and duct width on the flow and acoustic fields around the fan were investigated by compressible flow simulations with a volume penalization method. The computational methods were validated by comparing the predicted static pressure rise and aerodynamic sound by the fan with those measured. The sound pressure level became most intense for a specific rotational speed, where the acoustic resonance occurs at the blade passing frequency in the upstream duct. Although the overall tendency of the increase in the static pressure coefficient was found for a higher rotational speed with the thinner momentum thickness around the blade surface, the static pressure coefficient drops at the rotational speed for the acoustic resonance. Moreover, the acoustic resonance became more intense for a narrower duct width. In this condition, flow disturbances occur near the wall of the bell-mouthed inlet of upstream duct due to the acoustic resonance, which prompts the inflow turbulence to the fan. To clarify the effects of the acoustic resonance on the flow around the fan, the computation with the artificially suppressed acoustic resonance was also performed and the predicted flow fields were compared with those with intense acoustic resonance for the same rotational speed and duct width. The incoming flow to the fan is confirmed to become more turbulent when the acoustic resonance occurs, which promotes the spreading of the tip vortices between rotor blades. As a result, the blade loading decreases and the turbulence in the blade wake leading to mixing loss becomes intense, causing the static pressure rise by the fan to decrease.

    DOI: 10.1299/transjsme.22-00044

    researchmap

  14. Simulation of thermoacoustic heat pump effects driven by acoustic radiation in a cavity flow Reviewed

    Hiroshi Yokoyama, Yasuaki Omori, Masashi Kume, Masahito Nishikawara, Hideki Yanada

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   Vol. 185   2022.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Computations of coupled phenomena between the fluid and acoustic interactions in the cavity flow and heat conduction in the flat plates (stack) installed in the cavity were performed to investigate the flow conditions for an effective thermoacoustic heat pump driven by acoustic radiation in cavity flows. This research presents the first computational approach for an aeroacoustically excited thermoacoustic heat pump. The effects of the freestream Mach number on the thermoacoustic heat pump were investigated by conducting computations with Mach numbers 0.087 and 0.26, where intense self-sustained oscillations occurred. Sound pressure levels of the cavity tone and power of the related velocity fluctuations in the shear layer were reduced by the installation of the stack compared with the cavity flow without a stack, particularly at a lower Mach number. A steeper temperature gradient along the stack was acquired at a higher Mach number, and thermoacoustic heat pump effects were confirmed in the predicted acoustic oscillatory flow between the stack plates. The computational results present that the interaction between the recirculation flows in the cavity and the stack cause the heating of the flow around the cold top end of the stack. The thermoacoustic heat pump effects are reduced due to the interaction. The present computational method is expected to be useful for investigating the utilization of aerodynamical sound energy through conversion to heat energy. (c) 2021 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2021.122424

    Web of Science

    researchmap

  15. Influence of Casing Slit Shapes on Aerodynamic Characteristics and Generated Sound for an Axial-Flow Fan Reviewed

    ターボ機械 = Turbomachinery   Vol. 49 ( 6 ) page: 361 - 370   2021.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ターボ機械協会 ; 1973-  

    CiNii Books

    researchmap

  16. Control of cavity flow with acoustic radiation by an intermittently driven plasma actuator Reviewed

    Hiroshi Yokoyama, Keisuke Otsuka, Katsuya Otake, Masahito Nishikawara, Hideki Yanada

    PHYSICS OF FLUIDS   Vol. 32 ( 10 ) page: 106104   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    In a cavity flow with acoustic radiation, self-sustained oscillations are controlled by a continuously or intermittently driven plasma actuator with elongated electrodes in the streamwise direction, which induces spanwise non-uniformity of the incoming boundary layer. To evaluate the control effects, wind tunnel experiments and compressible flow simulations were conducted. As indicated by sound pressure measurements at the fundamental frequency, the sound reduction level afforded by the intermittent control may be higher than that provided by the continuous control, although both have the same power consumption. In particular, the sound reduction was highest at a certain intermittent frequency (i.e., effective frequency) under a constant driving voltage and duty ratio. To clarify the mechanism for the influence of the intermittent frequency on the control effects, the time variation of the incoming boundary layer and cavity flow during the intermittent period was investigated. The oscillations remained weak under the control of the effective intermittent frequency, while the attenuation and amplification of the oscillations were repeated in the actuator-on and actuator-off durations, respectively, under the control of intermittent frequencies lower than the effective frequency. The amplification rate of the oscillations was found to be correlated with the quality factor of the radiated sound without control. The relationship between the effective frequency and characteristic time for this amplification is also discussed in this paper.

    DOI: 10.1063/5.0017658

    Web of Science

    researchmap

  17. Compressible Simulation of Flow and Sound Around a Small Axial-Flow Fan With Flow Through Casing Slits Reviewed International journal

    Hiroshi Yokoyama, Katsutake Minowa, Kohei Orito, Masahito Nishikawara, Hideki Yanada

    Journal of Fluids Engineering   Vol. 142 ( 10 )   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ASME International  

    <title>Abstract</title>
    Small axial fans are used for cooling electronic equipment and are often installed in a casing with various slits. Direct aeroacoustic simulations and experiments were performed with different casing opening ratios to clarify the effects of the flow through the casing slits on the flow field and acoustic radiation around a small axial fan. Both the predicted and measured results show that aerodynamic performance deteriorates at and near the design flow rate and is higher at low flow rates by completely closing the casing slits compared with the fan in the casing with slits. The predicted flow field shows that the vortical structures in the tip vortices are spread by the suppression of flow through the slits at the design flow rate, leading to the intensification of turbulence in the blade wake. Moreover, the pressure fluctuations on the blade surface are intensified, which increases the aerodynamic sound pressure level. The suppression of the outflow of pressurized air through the downstream part of the slits enhances the aerodynamic performance at low flow rates. Also, the predicted surface streamline at the design flow rate shows that air flows along the blade tip for the fan with slits, whereas the flow toward the blade tip appears for the fan without slits. As a result, the pressure distributions on the blade and the torque exerted on the fan blade are affected by the opening ratio of slits.

    DOI: 10.1115/1.4047807

    Web of Science

    researchmap

  18. Temperature Dependence of the Characteristics of an Electrohydrodynamic Pump With Plate–Bar Electrodes Reviewed International journal

    Masahito Nishikawara, Ryo Yoneda, Yuji Shinagawa, Hideki Yanada, Takeshi Miyakita, Kenichiro Sawada

    IEEE Transactions on Industry Applications   Vol. 56 ( 1 ) page: 704 - 710   2020.1

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers ({IEEE})  

    DOI: 10.1109/TIA.2019.2951119

    Web of Science

    researchmap

  19. Numerical exploration of optimal microgroove shape in loop-heat-pipe evaporator Reviewed International journal

    Yuya Yamada, Masahito Nishikawara, Hideki Yanada

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   Vol. 15 ( 3 ) page: JTST0034   2020

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    The heat and mass transfer in a loop heat pipe evaporator with microgrooves are investigated in a three-dimensional numerical model. The design of the microgroove wick must consider the pressure loss of the vapor. The simulation obtains the detailed pressure distribution of the vapor flow in the grooves. The simulated heat flux distribution in the evaporator revealed that the applied heat flux concentrates along the three-phase contact line (TPCL) within the casing, wick, and grooves. The effect of TPCL length was investigated in three microgroove wicks with circumferential and axial grooves and a classical wick with only axial grooves. The heat-transfer coefficient initially increased with TPCL length increasing, but thereafter decreased because when the TPCL becomes too long, a large pressure loss occurs in the grooves. The developed model was validated experimentally. In both the model and experiment, the heat-transfer coefficient was locally maximized at a certain TPCL length. The proposed method is expected to provide a simple approach for wick design; especially, the wick shape can be optimized merely by varying the TPCL length. The effect of thermal conductivity of the wick material is also discussed.

    DOI: 10.1299/jtst.2020jtst0034

    Web of Science

    researchmap

  20. Experimental study of Electrohydrodynamic Conduction Pumping Embedded in Micro-Scale Evaporator Reviewed International coauthorship International journal

    Nishikawara, M; Yagoobi, J

    2020 IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING     2020

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/IAS44978.2020.9334813

    Web of Science

  21. Heat Transfer Enhancement of Loop-Heat-Pipe Evaporator using Copper Porous Media Reviewed

    M. Nishikawara, A. Shikano, H. Yanada

    Transactions of Society of Automotive Engineers of Japan   Vol. 50 ( 4 ) page: 1164 - 1169   2019.7

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  22. Predicting the performance of a loop heat pipe considering evaporation from the meniscus at the three-phase contact line Reviewed International journal

    Yuya Yamada, Masahito Nishikawara, Hideki Yanada, Yosuke Ueda

    Thermal Science and Engineering Progress   Vol. 11   page: 125 - 132   2019.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.tsep.2019.03.022

    Web of Science

    researchmap

  23. Static and dynamic liquid-vapor phase distribution in the capillary evaporator of a loop heat pipe Reviewed International journal

    M. Nishikawara, Y. Ueda, H. Yanada

    Microgravity Science and Technology   Vol. 31 ( 1 ) page: 61 - 71   2019.2

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Nature  

    DOI: 10.1007/s12217-018-9668-8

    Web of Science

    researchmap

  24. Liquid–vapor phase behavior and operating characteristics of the capillary evaporator of a loop heat pipe at start-up Reviewed International journal

    M. Nishikawara, K. Otani, Y. Ueda, H. Yanada

    International Journal of Thermal Sciences   Vol. 129   page: 426 - 433   2018.7

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier Masson SAS  

    The liquid–vapor phase distribution and displacement in the capillary evaporator of a loop heat pipe (LHP) are key phenomena affecting the steady-state and transient operating behavior. This study conducts optical observation of liquid–vapor phase behavior in the evaporator using a transparent glass tube heated by far-infrared radiation during start-up of the LHP. A quartz wick-acetone LHP system is designed, fabricated, and operated successfully with a heat flux of 1 W/cm2 transported by the cylindrical evaporator. To investigate effect of the liquid–vapor phase distribution in the evaporator at the initial state, start-up experiments with eight phase patterns—which are either liquid-saturated or two-phase in each of the inlet of the vapor line, grooves, and compensation chamber (CC)—are performed. The phase distribution affects the temperature profile although it has no effect upon the steady-state characteristics, and nucleate boiling occurs in the wick or groove simultaneously with evaporator-temperature drop when both the grooves and the inlet of the vapor line are completely filled with liquid. Liquid–vapor displacements from start-up to the steady-state are classified into four transient behaviors, which include boiling in the CC and meniscus oscillation at the three phase contact line within the case, wick, and groove.

    DOI: 10.1016/j.ijthermalsci.2018.03.023

    Web of Science

    Scopus

    researchmap

  25. Synergy between injection and dissociation mechanisms in electrohydrodynamic pumps modeled numerically Reviewed International journal

    Masahito Nishikawara, Hideki Yanada, Kota Shomura

    Journal of Electrostatics   Vol. 93   page: 137 - 145   2018.6

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    This paper reports a numerical investigation into the effects of interactions between two mechanisms of charge injection and dissociation on overall Electrohydrodynamic (EHD) pump characteristics. The following three types of electrode configurations are modeled: a plate and a bar, two plates on a channel wall, and embedded two-plate electrodes. The simulation results show that when the both mechanisms act in concert, the total developed pressure is augmented to be larger than the sum of the pressures developed by each mechanism separately. The degree to which the pressure is synergistically augmented depends on the configuration of electrodes.

    DOI: 10.1016/j.elstat.2018.04.009

    Web of Science

    Scopus

    researchmap

  26. Liquid-vapor phase displacement in the evaporator of a loop heat pipe at the start-up involving nucleate boiling Reviewed International journal

    西川原理仁, 上田洋佑, 柳田秀記

    日本機械学会論文集(Web)   Vol. 84 ( 860 ) page: ROMBUNNO.17‐00576(J‐STAGE) - 00576-17-00576   2018

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    &lt;p&gt;Liquid-vapor phase distribution and displacement in the capillary evaporator of loop heat pipes (LHP) is a key phenomenon to understand the steady state and transient behavior. However, the phenomenon has not been investigated sufficiently thus far. In this study, the liquid-vapor phase behavior on the contact surface between the wick and evaporator case at start-up is observed with a transparent evaporator case coated with an ITO heater. Visualization experiments are conducted during the LHP operation at 0.59 - 5.6 W/cm&lt;sup&gt;2&lt;/sup&gt; of heat flux applied to the evaporator. Nucleate boiling and temperature drop on the evaporator wall by superheating are observed when the grooves and vapor line inlet are initially saturated with liquid. Right after nucleate boiling, the whole surface of the wick is dried instantaneously, then liquid in the compensation chamber (CC) wets the wick. In the imbibition, two regimes where the liquid filling rate into the wick is different are found. At a high heat flux, vapor pockets are observed at the contact surface between the wick and evaporator case even in a steady state. Thermo-fluid simulations which take into account disordered porous media and effective thermal conductivity of the wick obtained from directly solving a heat conduction equation in reconstructed porous media using X-ray computed tomography are conducted. The simulation results of evaporator wall temperature and saturation at the contact surface agree with the observation at 5.6 W/cm&lt;sup&gt;2&lt;/sup&gt; of heat flux. Both simulation and observation results show residual liquid phase along the three-phase contact lines within the case, wick, and grooves.&lt;/p&gt;

    DOI: 10.1299/TRANSJSME.17-00576

    researchmap

  27. Numerical study on heat-transfer characteristics of loop heat pipe evaporator using three-dimensional pore network model Reviewed International coauthorship International journal

    Masahito Nishikawara, Hosei Nagano, Marc Prat

    APPLIED THERMAL ENGINEERING   Vol. 126   page: 1098 - 1106   2017.11

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    An important consideration while designing the shape of a capillary evaporator is the phase distribution in the wick. However, the distribution depends on the working fluids and porous materials. This study investigates the heat-transfer characteristics of a loop heat pipe (LHP) evaporator by using a threedimensional pore network model with a dispersed pore size wick. The simulation considers saturated and unsaturated wicks. A stainless steel (SS)-ammonia, polytetrafluoroethylene (PTFE)-ammonia, and copper-water LHP are simulated. The copper-water LHP has the highest transition heat flux to the unsaturated wick. When the optimum evaporator shape of the copper-water LHP is designed, it is reasonable to assume that the phase state is saturated. On the other hand, for the ammonia LHP design, the state is assumed to be unsaturated. Simulation results sliuw the heal-Liatisfer strut:Lute in the evaporator and indicate that the applied heat flux concentrates on the three-phase contact line (TPCL) within the case, wick, and grooves. An evaporator configuration with circumferential and axial grooves is simulated to investigate the effect of the TPCL length. Results indicate that the optimum shape can be realized by varying the TPCL length. The proposed method is expected to serve as a simple approach to design an evaporator. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.applthermaleng.2017.02.050

    Web of Science

    Scopus

    researchmap

  28. Microscale infrared observation of liquid-vapor interface behavior on the surface of porous media for loop heat pipes Reviewed

    Kimihide Odagiri, Masahito Nishikawara, Hosei Nagano

    APPLIED THERMAL ENGINEERING   Vol. 126   page: 1083 - 1090   2017.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    This paper reports on a visualization study investigating the characteristics of the liquid vapor interface behavior on the surface of a wick in the capillary evaporator of loop heat pipes. Observations were conducted with a microscopic infrared camera and a microscope. Nine different samples simulate a part of a wick were made by two different materials: polytetrafluoroethylene (PTFE); and stainless steel (SS). First, three types of liquid vapor interface behavior are reported. They are (a) evaporation at the menisci that formed at the boundary line between the heating plate, wick, and groove, (b) evaporation at the surface of small liquid bridges through nucleate boiling at the contact surface between the heating plate and wick, and (c) evaporation at the menisci in the wick. Secondly, the effect of the groove width on the maximum heat flux and the depth of a vapor pocket in the wick are reported. It was found that, as the groove width reduced, a higher heat transfer capacity was observed in both of the materials, except in the wick that had the smallest groove width. Additionally, it was found that the wick with the smallest fin width had the greatest potential for preventing vapor pockets formation in the wick. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.applthermaleng.2017.03.113

    Web of Science

    Scopus

    researchmap

  29. Numerical simulation of particle trajectories in the charge-injection type of electrostatic oil filter Reviewed

    H. Yanada, S. Matsuura, T. Yokoyama, M. Nishikawara

    Transactions of the Japan Fluid Power System Society   Vol. 48 ( 6 ) page: 39 - 46   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Fluid Power System Society  

    <p>This paper reports the trajectories of contaminant particles in the charge-injection type of electrostatic oil filter, and the effects of the supply flow velocity, the oil viscosity, and the filter element shape on the particle collection efficiency are investigated. The flow and electric fields in the filter are numerically simulated based on an assumption about the charge injected by the emitter electrode. Then, the particles' trajectories are calculated by numerically solving their equations of motion with different initial positions at the inlet of the filter. The simulated particle collection efficiency is compared with its measured value. The numerical results agree qualitatively with the experimental results. This particle trajectory analysis will be useful for improving the structure of the charge injection type of electrostatic oil filter.</p>

    DOI: 10.5739/jfps.48.39

    researchmap

  30. Numerical investigation of the characteristics of an ion drag pump Reviewed International journal

    Masahito Nishikawara, Mitsuhiro Shimada, Mizuki Saigo, Hideki Yanada

    JOURNAL OF ELECTROSTATICS   Vol. 84   page: 23 - 31   2016.12

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Simple, lightweight electrohydrodynamic pumps having no moving parts and producing no mechanical vibration or noise can enhance heat transfer, control fluid flows, and increase drying. This paper reports a numerical investigation of electrohydrodynamic (EHD) pumps having one centrally located emitter and two collector electrodes. Results show that optimum sizes exist in the length of and spacing between the collectors. Collector electrodes with triangular cross-sections can yield better performance than those having rectangular cross-sections. The magnitude and distribution of the charge density significantly influence pump performance. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elstat.2016.08.001

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0003-0090-6112

  31. Thermofluid Characteristics in Microporous Structure With Different Flow Channels for Loop Heat Pipe Reviewed

    Hosei Nagano, Masakazu Kuroi, Masahito Nishikawara

    HEAT TRANSFER ENGINEERING   Vol. 37 ( 11 ) page: 947 - 955   2016.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS INC  

    The use of two-phase heat transfer devices using capillary action in a microscale porous structure such as a loop heat pipe (LHP) is a promising heat transport technology. This is because they have characteristics of higher heat transfer power and longer heat transport distances with no electrical power compared with conventional heat pipes. The thermal performance of an LHP is governed by the thermofluid behavior in a microscale porous structure called the wick. In this research, high-performance wicks made of polymer have been developed, and their pore distribution and permeability were evaluated. The effects of the vapor channel's shape on the loop's thermal performance have been investigated by calculation and experiment to enhance evaporator performance. A mathematical model of the evaporator considering super heat in the channel, pressure drop across the wick, and two-phase pressure loss on the boundary face between the wick and the evaporator case was newly developed. The experiment was also conducted as a function of the groove shapes. From calculations and test results, it was found that in order to increase the maximum heat transport capability and decrease the operating temperature, the groove should be well distributed.

    DOI: 10.1080/01457632.2015.1098176

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0003-0090-6112

  32. Numerical simulation of capillary evaporator with microgap in a loop heat pipe Reviewed International journal

    Masahito Nishikawara, Hosei Nagano

    INTERNATIONAL JOURNAL OF THERMAL SCIENCES   Vol. 102   page: 39 - 46   2016.4

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER  

    A mathematical model to investigate the heat transfer characteristics of a capillary evaporator in a loop heat pipe with a microgap between the case and the wick was developed, and the gap effect on the evaporator heat-transfer coefficient is discussed. The model was validated by comparison with experimental results obtained for a polytetrafluoroethylene ethanol loop heat pipe. Calculated and experimental results agreed well below a 100 mu m gap distance, with both approaches indicating the existence of an optimal gap between 0 and 50 mu m. We clarify why the heat-transfer coefficient had a local maximum against the gap distance. The effect of the gap is determined for a change in heat flux to the evaporator, wick shape, working fluid, and thermal conductivity of the wick. The simulation showed that an optimal gap exists on the evaporator, except for the stainless steel wick. The microgap evaporator was workable for a wick made from a low thermal conductivity material. When a microgap is introduced in the loop heat pipe, the evaporator heat-transfer coefficient can be enhanced, hysteresis of the liquid vapor interface in a porous structure can be prevented, and the evaporator thermal performance can be predicted easily. Therefore, the microgap is an effective approach for thermal performance enhancement. (C) 2015 Elsevier Masson SAS. All rights reserved.

    DOI: 10.1016/j.ijthermalsci.2015.11.008

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0003-0090-6112

  33. Microscale Infrared Observation of Liquid–Vapor Phase Change Process on the Surface of Porous Media for Loop Heat Pipe Reviewed International journal

    K. Odagiri, M. Nishikawara, H. Nagano

    Journal of Electronics Cooling and Thermal Control   Vol. 6   page: 33 - 41   2016

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.4236/JECTC.2016.62003

    researchmap

  34. Numerical Analysis of Liquid-Vapor Thermo-Fluid Behavior in a Loop Heat Pipe Evaporator with Pore Network Model (Liquid-vapor phase distribution in a porous structure and heat-transfer characteristics) Reviewed

    NISHIKAWARA Masahito, NAGANO Hosei

    Thermal Science and Engineering   Vol. 23 ( 4 ) page: 71 - 80   2015

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Heat Transfer Society of Japan  

    Heat and mass transfer of an evaporator of a loop heat pipe (LHP), which had a liquid-vapor interface inside a porous wick, was analyzed by a three-dimensional model. Pore network model (PNM) was used to simulate the two-phase flow in the porous structure with a distribution of pore radius. The calculation includes two behaviors of phase distribution in a wick: the wick saturated with liquid fully and unsaturated with liquid and vapor. The evaporator heat-transfer coefficient as a function of heat flux had local maximum. The relation between the heat-transfer coefficient and liquid-vapor phase distribution in the wick were discussed.

    DOI: 10.11368/tse.23.71

    CiNii Research

    researchmap

  35. Parametric experiments on a miniature loop heat pipe with PTFE wicks Reviewed International journal

    Masahito Nishikawara, Hosei Nagano

    INTERNATIONAL JOURNAL OF THERMAL SCIENCES   Vol. 85   page: 29 - 39   2014.11

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER  

    A miniature loop heat pipe (LHP) with polytetrafluoroethylene (PTFE) wicks was fabricated and its evaporator thermal performance was investigated with parametric experiments. The variables considered were the clearance between the cylindrical evaporator casing and the wick, the working fluid inventory, the properties of the working fluids, and the sink temperature. Micro-gaps between the outer surface of the wick and inner surface of the evaporator casing were included in the experiments with variables of clearance to investigate their effect on the evaporator heat-transfer coefficient. Ethanol, acetone, and R134a were charged in the LHP to evaluate the effect of the properties of the working fluids. The LHP tests were conducted with several W/cm(2) of applied heat flux to the evaporator under controlled sink temperature. The clearance seriously affected the evaporator heat-transfer coefficient, with a gap of 20 mu m between the wick and casing having the best effect on the evaporator heat-transfer across a range of tested heat fluxes. The effects of the working fluid inventory and fluid properties on the evaporator heat-transfer were also clarified. Finally, the developed LHP was tested using ethanol as a working fluid under a stepwise heat load and sink temperature. (C) 2014 Elsevier Masson SAS. All rights reserved.

    DOI: 10.1016/j.ijthermalsci.2014.05.016

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0003-0090-6112

  36. Numerical study of thermal performance of a capillary evaporator in a loop heat pipe with liquid-saturated wick Reviewed International coauthorship International journal

    M. Nishikawara, H. Nagano, L. Mottet, M. Prat

    Journal of Electronics Cooling and Thermal Control   Vol. 27   page: 118 - 127   2014

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.4236/JECTC.2014.44013

    researchmap

  37. Evaporator heat-transfer analysis of a loop heat pipe with low thermal conductivity wicks Reviewed International coauthorship International journal

    M. Nishikawara, H. Nagano, M. Prat

    Heat Pipe Science and Technology, An International Journal   Vol. 5   page: 295 - 302   2014

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1615/HEATPIPESCIETECH.V5.I1-4.320

    researchmap

  38. Transient Thermo-Fluid Modeling of Loop Heat Pipes and Experimental Validation Reviewed International coauthorship International journal

    Masahito Nishikawara, Hosei Nagano, Tarik Kaya

    JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER   Vol. 27 ( 4 ) page: 641 - 647   2013.10

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST AERONAUTICS ASTRONAUTICS  

    A transient mathematical model is developed to study the transient response and analyze the distribution of heat load in a loop heat pipe. The model is based on the one-dimensional and time-dependent conservation equations for heat and fluid flow. The momentum and energy conservation equations for each of the loop heat pipe components are solved. The model results are compared against the data obtained from two miniature loop heat pipes using polytetrafluoroethylene wicks, ethanol, and acetone as working fluids. The mathematical model satisfactorily predicts the dynamic behavior of the loop heat pipe unit. It is shown that the percentage of heat leak across the wick decreases and the ratio of latent heat increases with increasing heat load. Some temperature overshoots observed in the calculation results are not observed in the experimental data. When a new power is applied, no time lag is observed in the loop heat pipe response between the simulation and experimental results.

    DOI: 10.2514/1.T3888

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0003-0090-6112

  39. Thermal Vacuum Testing of a Small Loop Heat Pipe with a PTFE Wick for Spacecraft Thermal Control Reviewed International journal

    NAGANO Hosei, NISHIKAWARA Masahito, FUKUYOSHI Fuyuko, NAGAI Hiroki, OGAWA Hiroyuki

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN   Vol. 10 ( ists28 ) page: Pc_27 - Pc_33   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES  

    A loop heat pipe (LHP) is a two-phase heat transfer device that utilizes the evaporation and condensation of a working fluid to transfer heat, and the capillary forces developed in fine porous wicks to circulate the fluid. LHPs have been gaining increased acceptance for spacecraft missions, and recently, small LHPs on the order of a few hundred watts have been investigated for this purpose. In this study, a 100W class small LHP with a polytetrafluoroethylene wick as the primary wick was designed and fabricated for thermal vacuum testing. The LHP has a thermoelectric converter (TEC) to control the loop operating temperature. The thermal vacuum test was conducted to evaluate the LHP's thermal performance under a space-simulated environment such as ultra-high-vacuum, and black body radiation, except for a gravitational effect. The loop showed large thermal hysteresis before and after the large and small head loads. The TEC was able to control the loop operating temperature with a small amount of electrical power.

    DOI: 10.2322/tastj.10.pc_27

    CiNii Research

    researchmap

  40. Small Loop Heat Pipe with Plastic Wick for Electronics Cooling Reviewed International journal

    Hosei Nagano, Masahito Nishigawara

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 50 ( 11 ) page: 11RF02-1 - 6   2011.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    In this paper, fabrication and test results of a small loop heat pipe (LHP) for electric cooling over a distance of 1100mm are discussed. Poly(tetrafluoroethylene) porous material with 1.2 mu m pore radius was used as a wick material for a primary pump of the loop to satisfy in both high thermal performance and low cost. High-grade ethanol was selected as a working fluid inside the loop. The small LHP with an outer diameter of 12mm and length of 77mm of an evaporator was made of stainless steel. The vapor and liquid transport lines are 1.8mm in inner diameter and 1100mm in length respectively in order to demonstrate the long-distance heat transport in a small tube, against the frictional resistance in the loop. The start-up process was monitored with an infrared camera, and quick start-up and its stable operation after the start-up were visually demonstrated. The loop could operate up to 50W heat load with the operating temperature of around 70 degrees C in the evaporator. The thermal resistance between the evaporator and the condenser of the loop was 0.58K/W at 50 W. (C) 2011 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.50.11RF02

    Web of Science

    researchmap

▼display all

Books 6

  1. 次世代パワーデバイスに向けた 高耐熱・高放熱材料の開発と熱対策 ~基板・接合・封止・冷却技術~

    西川原理仁( Role: Contributor ,  第6章、第5節)

    技術情報協会  2024.8  ( ISBN:9784867980309

     More details

    Language:Japanese Book type:Scholarly book

    researchmap

  2. 車載テクノロジー2023年2月号

    西川原理仁( Role: Contributor ,  ループヒートパイプ高性能化に向けた蒸発器内の熱輸送機構の解明)

    技術情報協会  2023.2 

     More details

    Language:Japanese

    researchmap

  3. 機能性流体フルードパワーシステムに関する研究委員会研究成果報告書

    西川原 理仁( Role: Contributor ,  5.7電気流体力学コンダクションポンプにおける寸法効果)

    一般社団法人日本フルードパワ-システム学会  2022.9 

     More details

    Language:Japanese

    researchmap

  4. 電子機器の放熱・冷却技術と部材の開発

    技術情報協会( Role: Contributor ,  第2章第1節)

    技術情報協会  2021.7  ( ISBN:9784861048524

     More details

    Total pages:676p   Language:Japanese

    CiNii Books

    researchmap

  5. 小型化・集密化する電子デバイスを支える熱輸送・冷却技術の進化と新展開

    ( Role: Contributor ,  第5章)

    サイエンス&テクノロジー(株)  2021.3 

     More details

  6. 次世代自動車の熱マネジメント

    技術情報協会( Role: Contributor ,  第8章 第3節)

    技術情報協会  2020.12  ( ISBN:9784861048197

     More details

    Total pages:649p   Language:Japanese

    CiNii Books

    researchmap

▼display all

MISC 4

  1. 2023年度の機能性流体分野の研究活動の動向 Invited

    西川原理仁

    日本フルードパワーシステム学会誌   Vol. 55   page: 13 - 16   2024.8

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    researchmap

  2. 博士,アカデミックポストに興味がある人に向けて Invited

    西川原理仁

    日本フルードパワーシステム学会誌   Vol. 53 ( 3 )   2022.5

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    researchmap

  3. アメリカでの在外研究生活 Invited

    西川原理仁

    日本フルードパワーシステム学会誌   Vol. 52 ( 1 ) page: 35 - 37   2021.1

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    researchmap

  4. ウースター工科大でのサバティカル Invited

    西川原理仁

    日本機械学会熱工学部門ニュースレター   Vol. 92   page: 9 - 13   2020.12

     More details

    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    researchmap

Presentations 119

  1. A Numerical Study on Heat Transfer Characteristics of a Loop Heat Pipe Evaporator Using Three-Dimensional Pore Network Model International coauthorship International conference

    M. Nishikawara, H. Nagano, M. Prat

    Joint 18th International heat pipe conference and 12th International Heat Pipe Symposium  2016.6 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju, Korea  

    researchmap

  2. 電気流体力学ポンプの完全特性

    樽谷啓介,柳田秀記,西川原理仁,横山博史

    日本設計工学会東海支部令和4年度研究発表講演会  2023.3.3 

     More details

    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  3. 水圧シリンダロッドシールの漏れ特性と摩擦特性

    藤井秀峰,柳田秀記,横山博史,西川原理仁

    日本設計工学会東海支部令和4年度研究発表講演会  2023.3.3 

     More details

    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  4. ジーロータポンプの騒音特性に及ぼす気泡含有率と気泡径の影響

    寺島遼,柳田秀記,西川原理仁,横山博史

    日本設計工学会東海支部令和4年度研究発表講演会  2023.3.3 

     More details

    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  5. 多孔体・電気流体力学による先進熱輸送技術

    西川原理仁

    超異分野学会豊橋フォーラム2022  2022.12.17 

     More details

    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  6. キャビティ音により駆動される熱音響ヒートポンプ

    久米将司, 横山博史, 西川原理仁, 柳田秀記

    第42回流力騒音シンポジウム  2022.12.15 

     More details

    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  7. 複数のオリフィス板を有する円筒キャビティの空力音直接解析

    福間章友、 横山博史、川﨑賢二、山極伊知郎、西川原理仁、柳田秀記

    第20回日本流体力学会中部支部講演会  2022.12.2 

     More details

    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  8. ハニカムフィルタを用いたCO2吸着に音響加振が及ぼす影響

    望月健太,横山博史,西川原理仁,柳田秀記

    第20回日本流体力学会中部支部講演会  2022.12.2 

     More details

    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  9. Simulation in micro EHD conduction pump with asymmetric flush electrode International conference

    Tomoya Ueda, Masahito Nishikawara, Hideki Yanada, Hiroshi Yokoyama, Hiroki Nagai

    The 19th International Conference on Flow Dynamics  2022.11.9 

     More details

    Event date: 2022.11

    Language:English   Presentation type:Poster presentation  

    researchmap

  10. 多孔体・電気流体力学による先進熱輸送技術

    西川原理仁

    T-GEx令和4年度研究成果エキシビション  2022.11.7 

     More details

    Event date: 2022.11

    Language:Japanese   Presentation type:Poster presentation  

    researchmap

  11. ループヒートパイプ流量制御に向けた電気体力学コンダクションポンプの設計

    瀬下玄輝,西川原理仁,宮北健,横山博史,柳田秀記

    第 66 回宇宙科学技術連合講演会  2022.11.2 

     More details

    Event date: 2022.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  12. 電気流体力学ポンプの特性に及ぼす液体導電率とポンプ寸法の影響

    樽谷啓介、柳田秀記、西川原理仁、横山博史

    日本設計工学会2022年度秋季研究発表講演会  2022.10.15 

     More details

    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  13. 自動変速機用油圧ポンプのロータ挙動とトルク特性に及ぼす気泡含有の影響

    柳田秀記、寺島遼、横山博史、西川原理仁

    日本設計工学会2022年度秋季研究発表講演会  2022.10.15 

     More details

    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  14. 上流ダクト内の音響共鳴を伴う軸流ファン周りの流れ場計測

    佐藤充、横山博史、金子友暁、西川原理仁、柳田秀記

    日本機械学会2022年度年次大会  2022.9.14 

     More details

    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  15. マイクロ電気流体力学コンダクションポンプにおけるスケール効果

    西川原理仁

    第46回静電気学会全国大会  2022.9.9 

     More details

    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  16. Scaling Effect on Electrohydrodynamic Conduction Pump with Embedded Electrode International conference

    M. Nishikawara, K. Okada, H. Yokoyama, H. Yanada

    12th International Symposium on Non-Thermal/Thermal Plasma for Pollution Control & Sustainable Energy (ISNTP-12) and International Symposium on Electrohydrodynamics 2022 (ISEHD 2022)  2022.8.30 

     More details

    Event date: 2022.8

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  17. 自動変速機用油圧ポンプの効率と騒音に及ぼす気泡含有の影響

    寺島遼, 児島諒, 蕗谷郁弥, 柳田秀記, 横山博史, 西川原理仁

    春季フルードパワーシステム講演会  2022.5.26 

     More details

    Event date: 2022.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  18. 太陽熱利用に向けた大きな吸熱面積を有するループヒートパイプの開発

    西川原 理仁,石田直輝,横山 博史,柳田 秀記

    第59回 日本伝熱シンポジウム  2022.5.20 

     More details

    Event date: 2022.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  19. Study on Phase Change Heat Transfer in Loop Heat Pipe Evaporator

    M. Nishikawara, S. Tomita, Hiroshi Yokoyama, H. Yanada

    Proceedings of AUN/SEED-Net Joint Regional Conferences in Transportation, Energy and Mechanical Manufacturing Engineering - RCTEMME2021  2021.12 

     More details

    Event date: 2021.12

    Language:English  

    researchmap

  20. Numerical Analysis of EHD Pumps with Electrodes on the Wall of a Flow Path

    Hideki Yanada, Kento Kimura, Hiroshi Yokoyama, Masahito Nishikawara

    Proceedings of AUN/SEED-Net Joint Regional Conferences in Transportation, Energy and Mechanical Manufacturing Engineering - RCTEMME2021  2021.12 

     More details

    Event date: 2021.12

    Language:English  

    researchmap

  21. Numerical simulation for control of acoustic oscillatory flow in a curved duct by a plasma actuator

    Katsuaki Yoza, Hiroshi Yokoyama, Masahito Nishikawara, Hideki Yanada

    Proceedings of AUN/SEED-Net Joint Regional Conferences in Transportation, Energy and Mechanical Manufacturing Engineering - RCTEMME2021  2021.12 

     More details

    Event date: 2021.12

    Language:English  

    researchmap

  22. Manufacturing and Evaluation of Similar Micro-Electrohydrodynamic Pumps with Different Scales

    K. Okada, M. Nishikawara, S. Naito, H. Yokoyama, H. Yanada

    Proceedings of 11th JFPS International Symposium on Fluid Power  2021.10 

     More details

    Event date: 2021.10

    Language:English  

    researchmap

  23. 銅短繊維を用いた多孔体の作製と浸透特性評価

    硲俊浩, 西川原理仁, 柳田秀記,横山博史

    日本設計工学会東海支部令和2年度研究発表講演会  2021.3.3 

     More details

    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  24. 流路壁面に電極を有する EHD ポンプ特性の数値解析

    木村憲人, 西川原理仁, 横山博史, 柳田秀記

    日本設計工学会東海支部令和2年度研究発表講演会  2021.3.3 

     More details

    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  25. サファイアチューブを用いた可視化ループヒートパイプにおける気液界面挙動の観察

    冨田 頌平,西川原 理仁,横山 博史,柳田 秀記

    日本設計工学会東海支部令和2年度研究発表講演会  2021.3.3 

     More details

    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  26. マイクロスケールEHDポンプ特性の解明

    岡田光太朗,西川原理仁,柳田秀記,横山博史

    令和二年度 エレクトロニクス先端融合研究所シンポジウム  2021.2.22 

     More details

    Event date: 2021.2

    Language:Japanese   Presentation type:Poster presentation  

    researchmap

  27. 流路壁面に電極を配置したEHDポンプの特性に及ぼす電極寸法の影響

    木村憲人, 西川原理仁, 横山博史, 柳田秀記

    2020年秋季フルードパワーシステム講演会  2020.12.8 

     More details

    Event date: 2020.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  28. Advanced heat transfer with porous media and electrohydrodynamics International conference

    M. Nishikawara

    The 5th Japan-US Science Forum in Boston  2020.11.14 

     More details

    Event date: 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  29. ダクト内に設置されたスリット付きケーシング内の軸流ファンの圧縮性解析

    金子 友暁, 横山 博史, 折戸 功平, 佐藤 充, 西川原 理仁, 柳田 秀記

    日本機械学会 第98期 流体工学部門 講演会  2020.11.13 

     More details

    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  30. 曲がり管内の音響エネルギー損失に関する数値解析

    與座 克明, 横山 博史,藤沢 拓弥,Norovtseren Ulziibuyan,西川原 理仁,柳田 秀記

    第18回日本流体力学会中部支部講演会  2020.11.7 

     More details

    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  31. サファイアチューブを用いた可視化ループヒートパイプにおける気液界面挙動の観察

    冨田頌平,西川原理仁,横山博史,柳田秀記

    日本伝熱学会東海支部2020年度支部講演会  2020.11.6 

     More details

    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  32. マルチエバポレータ型ループヒートパイプの太陽熱利用に向けた開発

    石田直輝, 西川原理仁, 柳田秀記,横山博史

    日本機械学会熱工学コンファレンス2020  2020.10.11 

     More details

    Event date: 2020.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  33. 共鳴管内の音響振動流に曲がり部が及ぼす影響

    藤沢拓弥,横山博史,與座克明,西川原理仁,柳田秀記

    可視化情報シンポジウム  2020.9.24 

     More details

    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  34. 軸流ファンの性能と発生音に及ぼすケーシングのスリット形状の影響

    折戸 功平,横山 博史,金子 友暁,西川原理仁,柳田秀記

    第84回ターボ機械協会総会講演会  2020.9.23 

     More details

    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  35. 音響放射を伴うキャビティ流れのプラズマアクチュエータによる間欠制御

    大竹 克也, 横山博史,西川原理仁, 柳田秀記

    日本機械学会 2020 年度年次大会  2020.9.13 

     More details

    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  36. Pore-scale approach to developing high-performance capillary evaporator in loop heat pipe International conference

    M. Nishikawara

    Thermal and Fluids Analysis Workshop 2020  2020.8.18 

     More details

    Event date: 2020.8

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  37. Development of a multi-evaporator loop heat pipe for solar heat utilization

    石田直輝, 西川原理仁, 柳田秀記, 横山博史

    日本伝熱シンポジウム講演論文集(CD-ROM)  2020.6.3 

     More details

    Event date: 2020.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  38. Maximizing heat-transfer coefficient of loop-heat-pipe evaporator with microgroove by three-dimensional simulation International conference

    M. Nishikawara, Y. Yamada, H. Yokoyama, H. Yanada

    The 31st Spacecraft Thermal Control Workshop  2020.3.24 

     More details

    Event date: 2020.3

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  39. Study on two-phase thermal hydraulics in porous structure and design method of capillary evaporator

    M. Nishikawara, Y. Yamada, S. Tomita, H. Yanada

    Proceedings of the 49th International Conference on Environmental Systems  2019.6 

     More details

    Event date: 2019.6

    Language:English  

    researchmap

  40. PTFE多孔体を用いた宇宙用小型ループヒートパイプの性能評価

    西川原理仁, 長野方星, 岡崎峻, 小川博之, 永井大樹

    宇宙科学技術連合講演会講演集(CD-ROM)  2012 

     More details

    Event date: 2012

    Language:Japanese  

    researchmap

  41. 自動変速機用ベーンポンプの特性とロータ挙動に及ぼす気泡含有の影響

    児島諒, 寺島遼, 蕗谷郁弥, 横山博史, 西川原理仁, 柳田秀記

    日本機械学会東海支部第71期総会  2022.3.4 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  42. 複数蒸発器を有する低熱流束ループヒートパイプの開発

    石田直輝,西川原 理仁,横山 博史,柳田 秀記

    日本設計工学会東海支部令和3年度研究発表講演会  2022.3.2 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  43. 逆洗フィルタの逆洗効率に及ぼす幾何的特性の影響

    荒木悠志, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成27年度研究発表講演会  2016.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  44. 銅ウィックを有する高熱流束ループヒートパイプの開発

    鹿野晃史, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成29年度研究発表講演会  2018.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  45. 電気流体力学コンダクションポンピングのスケール効果

    岡田光太朗,西川原理仁,内藤駿一,柳田秀記,横山博史

    日本伝熱学会東海支部2021年度支部講演会  2021.10.22 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  46. 電気流体力学コンダクションポンプにおける寸法効果 Invited

    西川原理仁

    日本フルードパワーシステム学会(JFPS)機能性流体フルードパワーシステムに関する研究委員会第11回研究委員会  2022.3.22 

     More details

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  47. 電気流体力学コンダクションポンプ特性におけるスケール効果

    岡田光太朗,西川原 理仁,横山 博史,柳田 秀記

    日本設計工学会東海支部令和3年度研究発表講演会  2022.3.2 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  48. 電気流体力学ポンプ特性に及ぼす液体導電率の影響

    樽谷啓介,田崎桃未,西川原 理仁,横山 博史,柳田 秀記

    日本設計工学会東海支部令和3年度研究発表講演会  2022.3.2 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  49. 電気流体力学流動現象に関する研究

    正村孝太, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成28年度研究発表講演会  2017.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  50. 電気流体力学現象を用いた能動熱制御技術の実現可能性検討

    澤田健一郎, 宮北健, 西川原理仁, 柳田秀記, 岡本篤, 杉田寛之

    第61回宇宙科学技術連合講演会  2017.10 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟  

    researchmap

  51. 電荷注入式静電フィルタ内の粒子の 3 次元軌跡解析

    横山智洋, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成28年度研究発表講演会  2017.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  52. 電荷注入式静電フィルタ内の電場と流れ場に及ぼす解離電荷の影響

    川﨑敦也,西川原 理仁,横山 博史,柳田 秀記

    日本設計工学会東海支部令和3年度研究発表講演会  2022.3.2 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  53. 自動変速機用ベーンポンプの圧力脈動と騒音に及ぼす気泡含有率の影響

    寺島 遼, 児島 諒,西川原 理仁,横山 博史,柳田 秀記

    日本設計工学会東海支部令和3年度研究発表講演会  2022.3.2 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  54. プラズマアクチュエータを用いた曲がり管内の音響振動流の制御

    與座克明,横山博史,西川原理仁,柳田秀記

    第23回スターリングサイクルシンポジウム  2021.12.4 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  55. ポアネットワークモデルを用いたループヒートパイプ蒸発器の気液熱流動挙動の解析(低熱負荷時のモデル構築)

    西川原理仁, 長野方星, M.Prat

    日本機械学会 熱工学コンファレンス2013  2013.10 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:弘前  

    researchmap

  56. ポアネットワークモデルを用いたループヒートパイプ蒸発器の気液熱流動挙動の解析(高熱負荷時のモデル構築)

    西川原理仁, 長野方星, M.Prat

    第51回日本伝熱シンポジウム  2014.5 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:浜松  

    researchmap

  57. ポアネットワークモデルを用いたループヒートパイプ蒸発器3次元解析 Invited International coauthorship

    第33回日本ヒートパイプ講演会  2014.7  日本ヒートパイプ協会

     More details

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京  

    researchmap

  58. マイクロEHDポンプの特性に及ぼす寸法の影響

    内藤駿一,西川原理仁,横山 博史,柳田秀記

    日本設計工学会東海支部令和元年度研究発表講演会  2020.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  59. マイクログルーブを有するループヒートパイプ蒸発器の性能予測

    山田 裕也, 西川原 理仁, 柳田 秀記

    日本伝熱学会東海支部平成30年度支部講演会  2019.2.1 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  60. マイクロスケール赤外・可視観察に基づく多孔体気液熱流動モデルの構築

    小田切公秀, 西川原理仁, 長野方星

    第54回日本伝熱シンポジウム  2017.5 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大宮  

    researchmap

  61. マイクロスケール赤外観察に基づく多孔質内気液二相熱流動特性の把握

    小田切公秀, 長野方星, 西川原理仁

    日本混相流学会混相流シンポジウム2016  2016.8 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都  

    researchmap

  62. ループヒートパイプにおける多孔体内気液二相流と熱伝達特性 Invited

    西川原理仁

    第11.0回相変化界面研究会  2021.3.26 

     More details

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  63. ループヒートパイプの基礎と設計および高性能化への応用 Invited

    西川原理仁

    日本テク ノセンターオンラインセミナー  2022.2.14 

     More details

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    researchmap

  64. Study on evaporator thermal conductance and hysteresis phenomenon of loop heat pipes

    Nishikawara Masahito, Nagano Hosei

    Proceedings of National Heat Transfer Symposium  2011  The Heat Transfer Society of Japan

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    DOI: 10.11368/nhts.2011.0.86.0

    CiNii Research

  65. Study on Transient Thermo-Fluid Modeling of Loop Heat Pipes

    Nishikawara Masahito, Nagano Hosei

    Proceedings of National Heat Transfer Symposium  2010  The Heat Transfer Society of Japan

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    DOI: 10.11368/nhts.2010.0.236.0

    CiNii Research

  66. ループヒートパイプ蒸発器のウィック設計方法の検討(ポアネットワークシミュレーションによる細孔径分布の影響)

    西川原 理仁

    日本機械学会熱工学コンファレンス2018  2018.10 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山  

    researchmap

  67. ループヒートパイプ蒸発器の動的気液界面挙動の観察

    西川原 理仁, 上田 洋祐, 柳田 秀記

    混相流シンポジウム2017  2017.8 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:調布  

    researchmap

  68. ループヒートパイプ蒸発器の多孔体ウィックにおける気液二相熱流動の非定常解析

    井坂俊貴, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成28年度研究発表講演会  2017.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  69. ループヒートパイプ蒸発器内の蒸発メニスカスの観察と熱流動解析

    山田 裕也, 西川原 理仁, 柳田 秀記, 大谷 浩輔, 上田 洋祐

    第54回日本伝熱シンポジウム  2017.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大宮  

    researchmap

  70. ループヒートパイプ蒸発器多孔体における気液界面挙動のマイクロスケール赤外観察

    小田切公秀, 長野方星, 西川原理仁

    平成27年度宇宙航行の力学シンポジウム  2015.12 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:相模原  

    researchmap

  71. ループヒートパイプ蒸発器多孔体内相変化素過程の解明に向けた研究(顕微赤外・可視観察および理論モデルの構築)

    小田切公秀, 長野方星, 西川原理仁

    平成28年度宇宙航行の力学シンポジウム  2016.12 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:相模原  

    researchmap

  72. 半円筒形フィルタエレメントを有する電荷注入式静電フィルタの粒子捕捉性能

    藤本博之, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成28年度研究発表講演会  2017.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  73. 可視化蒸発器を用いたループヒートパイプの起動特性と熱輸送機構に関する研究

    上田洋佑, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成29年度研究発表講演会  2018.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  74. 多孔体蒸発面における気液界面挙動のマイクロスケール赤外観察 (蒸気溝形状が熱伝達特 性に与える影響)

    小田切公秀, 長野方星, 西川原理仁

    混相流シンポジウム2015  2015.8 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:高知  

    researchmap

  75. 定在波型熱音響ヒートポンプに関する圧縮性解析

    大森康瑛, 横山博史, 岸野優輔,西川原理仁,柳田秀記

    第33回数値流体力学シンポジウム  2019.11 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

    researchmap

  76. 折れ部が共鳴管内の音響振動流に及ぼす影響に関する数値解析

    與座 克明,横山 博史,藤沢 拓弥,西川原理仁,柳田秀記

    TOKAI ENGINEERING COMPLEX 2020  2020.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  77. 排水過程における壁面-多孔体間での気液相界面挙動の観察

    松田 珠莉弥,小林 大輝,西川原 理仁,横山 博史,柳田 秀記

    日本機械学会熱工学コンファレンス  2019.10 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  78. 排水過程における壁面−多孔体間での不均一な界面挙動に関する研究

    小林大輝, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成30年度研究発表講演会  2019.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  79. 排水過程における多孔体-壁面間での不均一な気液相界面挙動の観察

    松田 珠莉弥,西川原理仁,横山 博史,柳田秀記

    日本設計工学会東海支部令和元年度研究発表講演会  2020.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  80. 油中粒子の帯電量に及ぼす電荷注入の影響

    内野拓実, 判澤拓実, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成29年度研究発表講演会  2018.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  81. 油圧アクチュエータの動的摩擦挙動に関する研究

    遠藤浩彰, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成27年度研究発表講演会  2016.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  82. 液体サイクロンによる油中粒子分離性能に及ぼすサイクロン形状の影響

    吉田昂平, 判澤拓実, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成28年度研究発表講演会  2017.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  83. 液体サイクロン粒子溜まり内の設置物が分離性能に与える影響

    眞鍋 諭, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成27年度研究発表講演会  2016.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  84. 潤滑油用逆洗フィルタの流れ場に及ぼす諸因子の影響

    岡野健, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成29年度研究発表講演会  2018.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  85. 片持ち平板を有するキャビティ流れの音響共鳴を伴なう自励振動

    横山博史,日比野加奈,西川原理仁,柳田秀記

    TSFDシンポジウム  2020.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

    researchmap

  86. 空気用 EHD ポンプの基礎研究

    磯村鷹弥, 米田涼, 西川原理仁, 柳田秀記

    平成27年度日本伝熱学会東海支部講演会  2016.2 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋  

    researchmap

  87. 空気用 EHD ポンプの特性に関する研究

    磯村鷹弥, 松村純宏, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成28年度研究発表講演会  2017.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  88. 細管流路を有するキャビティ流れの流体共鳴振動

    源 貴裕, 横山 博史, 久米 将司, 西川原 理仁, 柳田 秀記

    日本流体力学会年会2021  2021.9.21 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  89. プラズマアクチュエータによるキャビティ音間欠制御の圧縮性解析

    大竹 克也, 大塚 圭祐, 横山博史,西川原理仁, 柳田秀記

    日本流体力学会年会  2019.9 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

    researchmap

  90. Fabrication and visualization of loop-heat-pipe evaporators using transparent tubes International conference

    M. Nishikawara, K. Otani, Y. Ueda, H. Yanada

    Asian Conference on Thermal Sciences 2017  2017.3 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju, Korea  

    researchmap

  91. H223 Numerical Analysis of Liquid-Vapor Thermo-Fluid Behavior in a Loop Heat Pipe Evaporator with Pore Network Model : Modeling in a low heat-load mode

    Nishikwara Masahito, Nagano Hosei, Prat Marc

    The Proceedings of the Thermal Engineering Conference  2013  The Japan Society of Mechanical Engineers

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Heat-transfer characteristics of an evaporator of a miniature loop heat pipe (LHP), which had a FIFE porous wick filled with liquid fully, was analyzed on 3D. Pore network model (PNM) was used to simulate detailed liquid flow in the porous structure. Temperature and pressure fields of x-y, x-z, and y-z plane were presented. The results indicated that condensation at bottom of the grooves-wick interface occurred. The condensation behavior depended on the applied heat flux to the evaporator. The effect of the groove width on the evaporator heat-transfer coefficient and heat leak to a compensation chamber was clarified.

    DOI: 10.1299/jsmeted.2013.423

    CiNii Research

  92. Heat Transfer of LHP Evaporators with Micro Gap International conference

    M. Nishikawara, H. Nagano

    29th International Symposium on Space Technology and Science  2013.6 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya, Japan  

    researchmap

  93. Liquid-vapor phase displacement of a capillary evaporator in various operations of a loop heat pipe International conference

    Y. Ueda, M. Nishikawara, H. Yanada

    10th International Conference on Boiling and Condensation Heat Transfer  2018.3 

     More details

    Language:English   Presentation type:Poster presentation  

    Venue:Nagasaki, Japan  

    researchmap

  94. Microscale Infra-Red Observation of Liquid-Vapor Phase Change Process on the Surface of Porous Media International conference

    K. Odagiri, M. Nishikawara, H. Nagano

    The First Pacific Rim Thermal Engineering Conference  2016.3 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hawaii, USA  

    researchmap

  95. Microscale infrared observation of liquid-vapor interface behavior on the surface of porous media for loop heat pipe International conference

    K. Odagiri, M. Nishikawara, H. Nagano

    Joint 18th International heat pipe conference and 12th International Heat Pipe Symposium  2016.6 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju, Korea  

    researchmap

  96. Oscillations of a flexible beam in cavity flow with tonal sound International conference

    Hiroshi Yokoyama, Kana Hibino, Masahito Nishikawara, Hideki Yanada

    The joint conference of the International Conference on Global Network for Innovative Technology and International Conference on Vibration, Sound and Structural Dynamics (IGNITE-ICVSSD 2019)  2019.12 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  97. Performance prediction of a loop heat pipe considering evaporation from the meniscus at the three-phase contact line International conference

    Y. Yamada, M. Nishikawara, H. Yanada, Y. Ueda

    Joint 19th IHPC and 13th IHPS  2018.6 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Pisa, Italy  

    researchmap

  98. Study on characteristics of two-phase thermal hydraulics in porous structure based on microscale infrared observation and modeling International conference

    K. Odagiri, M. Nishikawara, H. Nagano

    The Fourth International Forum on Heat Transfer (IFHT2016)  2016.11 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sendai, Japan  

    researchmap

  99. The Effect of Vapor Groove Configuration of the Porous Media on the Heat Transfer Performance (Observation with Microscopic Infrared Thermography under the Atmospheric Condition) International conference

    K. Odagiri, H. Nagano, M. Nishikawara

    10th International Conference on Two-Phase Systems for Space and Ground Applications  2015.9 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto, Japan  

    researchmap

  100. Thermally affected characteristics of EHD pump with fluorinated liquid International conference

    M. Nishikawara, R. Yoneda, Y. Shinagawa, H. Yanada, T. Miyakita, K. Sawada

    15th International Conference on Flow Dynamics  2018.11 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sendai, Japan  

    researchmap

  101. ガラス管蒸発器を有するループヒートパイプの起動時における気液界面挙動の観察

    上田 洋祐, 西川原 理仁, 柳田 秀記, 大谷 浩輔

    第22回動力・エネルギー技術シンポジウム  2017.6 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋  

    researchmap

  102. ガラス管蒸発器を有する可視化ループヒートパイプの構築

    大谷 浩輔, 上田 洋佑, 西川原理仁, 柳田秀記

    日本機械学会熱工学コンファレンス2016  2016.10 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山  

    researchmap

  103. キャビティ音により駆動される熱音響ヒートポンプの数値解析

    久米将司,横山博史,源貴裕,西川原理仁,柳田秀記

    日本機械学会 2021 年度年次大会  2021.9.5 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  104. サファイアチューブを用いた可視化ループヒートパイプにおける気液界面挙動の観察

    冨田 頌平,西川原 理仁,横山 博史,柳田 秀記

    日本機械学会熱工学コンファレンス  2019.10 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  105. スリットを有するケーシング内の小型軸流ファンの性能・発生音の測定

    折戸 功平,横山 博史,蓑和 克武,西川原理仁,柳田秀記

    日本機械学会第97期流体工学部門講演会  2019.11 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋  

    researchmap

  106. ダクト内の音響共鳴を伴うファン周りの流れに関する圧縮性流体解析

    金子 友暁, 横山 博史, 佐藤 充, 西川原 理仁

    第35回数値流体力学シンポジウム  2021.12.14 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  107. 3次元熱流動解析に基づくマイクログルーブを有するループヒートパイプ蒸発器の最適設計(3次元数値モデルの構築)

    山田 裕也, 西川原 理仁, 柳田 秀記

    第39回日本熱物性シンポジウム  2018.11 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  108. Characteristics of thermo-fluid behavior in an evaporator of loop heat pipes based on microscale infrared/visible observations and modeling International conference

    K. Odagiri, H. Nagano, M. Nishikawara

    47th International Conference on Environmental Systems  2017.7 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Charleston, USA  

    researchmap

  109. Effect of Thermodynamic Properties of Working Fluid on Loop-Heat-Pipe Performance Invited International conference

    M. Nishikawara, H. Nagano

    10th International Conference on Two-Phase Systems for Space and Ground Applications  2015.9 

     More details

    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:Kyoto, Japan  

    researchmap

  110. Effects of Charge Injection and Field-Enhanced Dissociation on Electrohydrodynamic Flow and Pumping International conference

    Hideki Yanada, M. Nishikawara, Kota Shomura

    14th International Conference on Flow Dynamics  2017.11 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sendai, Japan  

    researchmap

  111. Effects of liquid physical properties and charge generation mechanism on electrohydrodynamic flow and pumping International conference

    M. Nishikawara, K. Shomura, M. Saigo, H. Yanada

    10th JFPS International Symposium on Fluid Power  2017.10 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Fukuoka, Japan  

    researchmap

  112. Effects of stack position on thermoacoustic heat pump in a rectangular resonator International conference

    Y. Kishino, H. Yokoyama, Y. Omori, M. Nishikawara

    26th International Congress on Sound and Vibration  2019.7.7 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  113. EHD ポンプ特性に及ぼす液体物性の影響

    西郷瑞輝, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成27年度研究発表講演会  2016.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  114. EHDポンプの多段化特性

    笹山高央,西川原理仁,横山博史,柳田秀記

    日本設計工学会東海支部令和元年度研究発表講演会  2020.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  115. EHDポンプ特性に及ぼす注入電荷と解離電荷の影響

    品川裕次, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成30年度研究発表講演会  2019.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  116. EHDポンプ特性に及ぼす温度の影響

    米田涼, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成29年度研究発表講演会  2018.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  117. EHDポンプ特性に及ぼす電極形状と寸法の影響

    中村裕朔, 西川原理仁, 柳田秀記

    日本設計工学会東海支部平成29年度研究発表講演会  2018.3 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

    researchmap

  118. EHDポンプ特性に及ぼす電荷生成機構の影響

    柳田秀記, 正村孝太, 西川原理仁

    平成29年春季フルードパワーシステム講演会  2017.5 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

    researchmap

  119. EHDポンプ特性の温度依存性に関する研究

    柳田秀記, 西川原理仁, 米田涼, 宮北健, 澤田健一郎

    平成30年春季フルードパワーシステム講演会講演論文集  2018.5 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

    researchmap

▼display all

Research Project for Joint Research, Competitive Funding, etc. 10

  1. 国際交流援助( 共同研究 )

    2023.6 - 2023.7

      More details

    Authorship:Principal investigator 

    researchmap

  2. 令和4年度工学研究奨励援助金

    2022.10 - 2023.9

      More details

    Authorship:Principal investigator 

    researchmap

  3. 令和4年度不二科学技術振興財団研究助成

    2022.4 - 2023.3

      More details

    Authorship:Principal investigator  Grant type:Competitive

    researchmap

  4. 2022年度公益財団法人立松財団一般研究助成

    2022.4 - 2023.3

      More details

    Authorship:Principal investigator 

    researchmap

  5. 令和2年度日比科学技術振興財団研究助成

    2020.5 - 2022.5

      More details

    Authorship:Principal investigator 

    researchmap

  6. 第31回東海産業技術振興財団研究助成

    2019.4 - 2021.3

      More details

    Authorship:Principal investigator 

    researchmap

  7. 平成30年度八洲環境技術振興財団研究開発・調査助成

    2019.4 - 2020.3

      More details

    Authorship:Principal investigator 

    researchmap

  8. 平成30年度岩谷科学技術研究助成

    2019.4 - 2020.3

      More details

    Authorship:Principal investigator 

    researchmap

  9. 2018年度研究費助成

    2018.11 - 2021.10

      More details

    Authorship:Principal investigator 

    researchmap

  10. マイクロ多孔体内蒸発メニスカス観察に基づく自律温度制御型ループヒートパイプの開発

    Grant number:13J00148  2013.4 - 2015.3

    特別研究員奨励費  特別研究員奨励費

    西川原 理仁

      More details

    Authorship:Principal investigator  Grant type:Competitive

    本研究では、自律的に高精度温度制御が可能なループヒートパイプ(LHP)の開発を目的とし、特にLHP蒸発器の相変化を伴う多孔体内気液熱流動の解明および蒸発器最適設計方法の構築などを目指してきた。今年度は昨年度の滞在研究(IMFT)で構築したポアネットワークモデルを用いたLHP蒸発器3次元解析を名古屋大学情報基盤センターの計算機で実行できる環境を構築した。多孔体材料(熱伝導率、空隙特性)、作動流体、蒸発器形状を変化させた数百パターンの計算を行い、LHP熱性能におけるウィック熱伝導率、気液界面形状、作動流体の物性、ウィック形状、マイクロギャップ(蒸発器ケースとウィックとの隙間)などの影響を解析的に明らかにした。特にウィック形状を変化させた解析により、蒸発器ケース-ウィック-グルーブの共有する三相界線長さという性能を支配する新たなパラメータを導くことができ、軸方向に周方向グルーブを加えた3次元形状を有するウィックを製作し、LHP実験により有効性を実証した。しかし、三相界線を長くするためグルーブをマイクロオーダーの幅まで細くしたところ、性能が低下し、3次元マイクログル-ブ形状に関しては今後の課題となった。
    これまでの解析は仮想的な多孔体空隙配置を仮定したものであったが、実際の形状を用いた解析により高精度化を図るため、空間分解能0.27 μmを有するX線CTにより多孔体の内部構造の観察を行い、空隙構造の三次元再構築を行った。さらに多孔体構造解析を行い3次元空隙回路網を作成した。解析結果は、実際の多孔体ネットワークを用いた解析や粒子的手法を用いた直接解析などに利用可能であると考えられ、さらなる解析の高精度化が達成され得るものである。
    最後に本研究をまとめた学位論文「マルチスケール気液二相熱流動解析に基づくループヒートパイプ熱輸送機構の解明と高性能化に関する研究」(名古屋大学)が受理された。

    researchmap

▼display all

KAKENHI (Grants-in-Aid for Scientific Research) 4

  1. Scale effects on electrohydrodynamic conduction pumping

    Grant number:21K14075  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists  Grant-in-Aid for Early-Career Scientists

      More details

    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    researchmap

  2. Liquid-vapor phase diagram in porous media heated laterally

    Grant number:18K13700  2018.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists  Grant-in-Aid for Early-Career Scientists

    Nishikawara Masahito

      More details

    Authorship:Principal investigator  Grant type:Competitive

    The purpose of this work is to understand liquid-vapor two-phase displacement in porous media where heat and fluid are applied and liquid and to make the phase diagram. The phase displacement taking place at the contact surface between the liquid-saturated porous media and glass plate where vapor was injected was observed. The vapor phase stabilized shaped capillary fingering (CF) at less than 2.0×10-2 of capillary number Ca, while the viscous fingering (VF) presented at Ca = 2.0×10-2. The transition between CF and VF was observed. The liquid-vapor boundary line was long when the viscosity ratio of liquid to vapor is high and the contact angle between porous media and liquid is small.

    researchmap

  3. Investigation into the characteristics of electrohydrodynamic pumps and their applications to space heat transport devices

    Grant number:16K06076  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Yanada Hideki

      More details

    Authorship:Coinvestigator(s)  Grant type:Competitive

    This study investigates the effects of the two charge generation mechanisms, charge injection and dissociation, and liquid temperature on overall EHD pump chanracteristics. It is shown that when the mechanisms of charge injection and dissociation act in concert, the total developed pressure is augmented to be larger than the sum of the pressures developed by each mechanism separately. This synergistic augmentation is caused by the interactions between the injected and dissociated charges. It is also found that the degree to which the pressure is synergistically augmented depends on the configuration of electrodes in the EHD design. In addition, it is shown that the pressure developed by the EHD pump at a zero flow rate increases with decreasing temperature and the slope of pressure-flow rate characteristics is steeper with lower temperature. The results obtained in the study will contribute to designing EHD pumps suited to heat transport devices used in space.

    researchmap

  4. Study on micro meniscus behavior in the capillary evaporator of a loop heat pipe

    Grant number:15H06287  2015.8 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up  Grant-in-Aid for Research Activity Start-up

    Nishikawara Masahito

      More details

    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    To develop design method for the capillary evaporator shape in a loop heat pipe, this study observed thermo-fluid behavior in the evaporator and developed a numerical model for heat transfer of the evaporator taking meniscus at a three-phase contact line (TPCL) within the case, wick, and grooves into account and a method to optimize wick shape in the evaporator. The meniscus at the TPCL was observed by developed the visualization evaporator using a quartz glass tube during the LHP operation and the meniscus oscillated with size amplitude of 10-400 μm at a steady state. The developed numerical model showed that evaporator heat-transfer coefficient increased with 80 % when the meniscus was taken into account. The developed optimization method was validated with the experimental results and the evaporator heat-transfer coefficient reached a local maximum in terms of the TPCL length.

    researchmap

Industrial property rights 4

  1. 冷却装置および電気分解装置

    西川原理仁

     More details

    Applicant:名古屋大学

    Application no:特願2024-148582  Date applied:2024.8

    Country of applicant:Domestic  

    researchmap

  2. ループヒートパイプ及び放熱量の制御方法

    西川原理仁, 宮北健

     More details

    Applicant:豊橋技術科学大学

    Application no:特願2022-174750  Date applied:2022.10

    researchmap

  3. 蒸発器の製造方法

    西川原 理仁, 大谷 浩輔, 上田 洋佑

     More details

    Applicant:国立大学法人豊橋技術科学大学

    Application no:特願2017-213741  Date applied:2017.11

    Announcement no:特開2019-086198  Date announced:2019.6

    J-GLOBAL

    researchmap

  4. 熱交換器および電子機器

    西川原 理仁, 長野 方星

     More details

    Applicant:長野 方星

    Application no:特願2012-195748  Date applied:2012.9

    Announcement no:特開2014-052110  Date announced:2014.3

    J-GLOBAL

    researchmap

 

Media Coverage 1

  1. Press release Internet

    https://www.nagoya-u.ac.jp/researchinfo/result-en/2024/06/20240611-01.html  2024.6

     More details

    Author:Myself 

    https://phys.org/news/2024-06-device-boosts-lunar-rover-longevity.html

    researchmap