| Yasuhisa SHINMOTO | Last modified date：2024.04.15 |
Assistant Professor /
Space Systems Engineering /
Department of Aeronautics and Astronautics /
Faculty of Engineering
Papers
| 1. | Koichi INOUE, Haruhiko OHTA, Yuuki TOYOSHIMA, Hitoshi ASANO, Osamu KAWANAMI, Ryoji IMAI, Koichi SUZUKI, Yasuhisa SHINMOTO, Takashi KURIMOTO and Satoshi MATSUMOTO, Heat Loss Analysis of Flow Boiling Experiments Onboard International Space Station with Unclear Thermal Environmental Conditions (2nd Report: Liquid-vapor Two-phase Flow Conditions at Test Section Inlet), Springer, Microgravity Science and Technology, Vol. 33, Issue 5, No. 57, https://doi.org/10.1007/s12217-021-09902-7, 33, 2, 1-19, 2021.08. |
| 2. | Koichi INOUE, Haruhiko OHTA, Yuuki TOYOSHIMA, Hitoshi ASANO, Osamu KAWANAMI, Ryoji IMAI, Koichi SUZUKI, Yasuhisa SHINMOTO and Satoshi MATSUMOTO, Heat Loss Analysis of Flow Boiling Experiments Onboard International Space Station with Unclear Thermal Environmental Conditions (1st Report: Subcooled Liquid Flow Conditions at Test Section Inlet), Springer, Microgravity Science and Technology, Vol. 33, Issue 2, No. 28, https://doi.org/10.1007/s12217-021-09869-5, 33, 28, 2021.03, [URL], Two series of flow boiling experiments have been conducted onboard the International Space Station (ISS) as a part of the TPF (Two-Phase Flow) experiment promoted by JAXA during July 2017–March 2018, February 2019–July 2019. Microgravity data on two-phase flow and heat transfer in flow boiling of n-Perfluorohexane (FC-72) have been obtained by a copper heated test tube and a transparent glass heated tube in a wide experimental range of mass velocity, liquid subcooling, vapor quality and heat flux. Furthermore, detailed two-phase flow behaviors have been observed by using high frame rate camera in the unheated observation section. In order to elucidate the accurate influence of gravity on flow boiling, it is essential to compare the heat transfer data and two-phase flow behaviors obtained under normal (terrestrial) gravity and microgravity environments at the same flow and heating conditions. However, both experiments cannot be performed by using the same experimental apparatus and under the same thermal environmental conditions. In addition, the heat loss cannot be negligible due to the forced avionics air flow inside the experimental apparatus in ISS. Therefore, exact evaluation of the fluid conditions at the inlet of the heated test tube requires the heat loss model with high-accuracy. In the present paper, the heat loss models for evaluating the degree of liquid subcooling at the inlet of the heated test tube and net heat flux from the heated tube to test fluid has been developed by using the results of preliminary heat loss experiments conducted onboard ISS. The correction of the degree of liquid subcooling by the proposed heat loss models is not negligible for the accurate analysis of gravity effects. The accuracy of the heat loss models has been verified through the evaluation of heat transfer coefficients for single-phase turbulent forced convection obtained from the heating experiments onboard ISS.. |
| 3. | "Boiling Two-Phase Flow Experiments on board the International Space Station (Gas-Liquid Interface Structure of One-component Gas-Liquid Two-Phase Flows)", Hitoshi ASANO, Takuma ISHIGE, Hiroyuki NAKAKSE, Osamu KAWANAMI, Koichi INOUE, Koichi SUZUKI, Ryoji IMAI, Yasuhisa SHINMOTO, Satoshi MATSUMOTO and Haruhiko OHTA The Proceedings of the Fluids engineering conference, Vol. 2020, No. OS11-06, 2020. |
| 4. | Satoshi MATSUMOTO, Haruhiko OHTA, Hitoshi ASANO, Osamu KAWANAMI, Ryoji IMAI, Yasuhisa SHINMOTO and Koichi SUZUKI, Boiling Two-Phase Flow experiment in microgravity onboard International Space station, Proceedings of the International Astronautical Congress, IAC, Vol. 2018-October, 2018 69th International Astronautical Congress: #InvolvingEveryone, IAC 2018; Bremen; Germany; 1 October 2018 through 5 October 2018; Code 147415 , 2018.01, A series of systematic experiments was performed using a boiling and two-phase flow loop under the microgravity condition provided by the International Space Station. Based on the understanding of gas-liquid interfacial behaviour and highly reliable data on heat transfer characteristics from this experiment, we clarify the details of elementary processes concerning boiling two-phase flow under the microgravity condition. This experiment also demonstrates a boiling cooling system in space. Through this experiment, we acquired data useful for designing a high-performance and compact thermal control system, aiming to develop it into an innovative space platform. The microgravity experiment was performed from July 2017 to March 2018. The experimental facility worked well, and a lot of data were able to accumulate. Under the certain regime of experimental condition, it was completely different from the behaviour of boiling bubbles on the ground. As a result, heat transfer also showed unique characteristics.. |
| 5. | Satoshi Matsumoto, Haruhiko Ohta, Hitoshi Asano, Osamu Kawanami, Ryoji Imai, Yasuhisa Shinmoto, Koichi Suzukig, Boiling Two-Phase Flow experiment in microgravity onboard International Space station, 69th International Astronautical Congress: #InvolvingEveryone, IAC 2018 Proceedings of the International Astronautical Congress, IAC, 2018-October, 2018.01, A series of systematic experiments was performed using a boiling and two-phase flow loop under the microgravity condition provided by the International Space Station. Based on the understanding of gas-liquid interfacial behaviour and highly reliable data on heat transfer characteristics from this experiment, we clarify the details of elementary processes concerning boiling two-phase flow under the microgravity condition. This experiment also demonstrates a boiling cooling system in space. Through this experiment, we acquired data useful for designing a high-performance and compact thermal control system, aiming to develop it into an innovative space platform. The microgravity experiment was performed from July 2017 to March 2018. The experimental facility worked well, and a lot of data were able to accumulate. Under the certain regime of experimental condition, it was completely different from the behaviour of boiling bubbles on the ground. As a result, heat transfer also showed unique characteristics.. |
| 6. | Yasuhisa SHINMOTO, Daijiro YAMAMOTO, Daisuke FUJII, Haruhiko OHTA, Heat Transfer Characteristics during Boiling of Immiscible Liquids Flowing in Narrow Rectangular Heated Channels, Frontiers in Mechanical Engineering (Thermal and Mass Transport), 10.3389/fmech.2017.00016, 3, 16, 2017.11, [URL], The use of immiscible liquids for cooling of surfaces with high heat generation density is proposed based on the experimental verification of its superior cooling characteristics in fundamental systems of pool boiling and flow boiling in a tube. For the purpose of practical applications, however, heat transfer characteristics due to flow boiling in narrow rectangular channels with different small gap sizes need to be investigated. The immiscible liquids employed here are FC72 and water, and the gap size is varied as 2, 1, and 0.5 mm between parallel rectangular plates of 30 mm x 175 mm, where one plate is heated. To evaluate the effect of gap size, the heat transfer characteristics are compared at the same inlet velocity. The generation of large flattened bubbles in a narrow gap results in two opposite trends of the heat transfer enhancement due to thin liquid film evaporation and of the deterioration due to the extension of dry patch in the liquid film. The situation is the same as that observed for pure liquids. The latter negative effect is emphasized for extremely small gap sizes if the flow rate ratio of more-volatile liquid to the total is not reduced. The addition of small flow rate of less-volatile liquid can increase the critical heat flux (CHF) of pure more-volatile liquid, while the surface temperature increases at the same time and assume the values between those for more-volatile and less-volatile liquids. By the selection of small flow rate ratio of more-volatile liquid, the surface temperature of pure less-volatile liquid can be decreased without reducing high CHF inherent in the less-volatile liquid employed. The trend of heat transfer characteristics for flow boiling of immiscible mixtures in narrow channels is more sensitive to the composition compared to the flow boiling in a round tube.. |
| 7. | Satoshi OKAYAMA, Keisuke IWATA, Yasuhisa SHINMOTO, Haruhiko OHTA, "Improvement of Nucleate Boiling Heat Transfer for Using Immiscible Mixtures", Proceedings of Symposium on Multiphase Flow 2016, The Japanese Scoety for Multiphase Flow (JSMF), F131 (UFD 2 pages), 10 Aug., 2016.. |
| 8. | Daijiro YAMAMOTO, Daisuke YAMAMOTO, Yasuhisa SHINMOTO, Haruhiko OHTA, "Flow Boiling Heat Transfer to Immiscible Mixtures in a Narrow Channel", Proceedings of Symposium on Multiphase Flow 2016, The Japanese Scoety for Multiphase Flow (JSMF), F132 (UFD 2 pages), 10 Aug., 2016.. |
| 9. | Taisaku GOMYO, Ryosuke UKENA, Hitoshi ASANO, Haruhiko OHTA, Yasuhisa SHINMOTO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Takashi KURIMOTO, Satoshi MATSUMOTO, Kenichiro SAWADA, "Study on flow development of one-component two-phase flows", Proceedings of Symposium on Multiphase Flow 2016, The Japanese Scoety for Multiphase Flow (JSMF), F135 (UFD 2 pages), 10 Aug., 2016.. |
| 10. | Haruhiko OHTA, Yasuhisa SHINMOTO, Daisuke YAMAMOTO, Keisuke IWATA, Boiling of Immiscible Mixtures for Cooling of Electronics, Electronics Cooling, InTech, edited by S M Sohel Murshed, 10.5772/62341, 11-29, book edited by S M Sohel Murshed, ISBN 978-953-51-2406-1, Print ISBN 978-953-51-2405-4, Published: June 15, 2016 under CC BY 3.0 license. pp.11-29 (19 pages), Chapter 2, 2016.06, [URL], To satisfy the requirements for the cooling of small and large semiconductors operated at high heat flux density, an innovative cooling method using boiling heat transfer to immiscible liquid mixtures is proposed. Immiscible liquid mixtures discussed here are composed of more-volatile liquid with higher density and less-volatile liquid with lower density, and appropriate volumetric ratios become a key to realize high-performance cooling. The chapter reviews the experimental results obtained by the present authors, where critical heat flux accompanied by the catastrophic surface temperature excursion is increased up to 300 W/cm2 for FC72/water by using a flat heating surface of 40 mm in diameter facing upwards under the pressure 0.1 MPa. To apply the superior heat transfer characteristics in boiling of immiscible mixtures to flow boiling system, preliminary experiments using a horizontal heated tube are performed and the classification of flow pattern with liquid-liquid interface and corresponding heat transfer performance are discussed.. |
| 11. | Satoshi OKAYAMA, Keisuke IWATA, Yasuhisa SHINMOTO, Haruhiko OHTA, Improvement of Cooling Performance for Electronic Devices by Nucleate Boiling of Immiscible Mixtures, 7th European Thermal-Sciences Conference, 10.1088/1742-6596/745/3/032073, 745, Volume 745, 032073, 8 pages, published online: 21 October 2016, 2016.06, [URL]. |
| 12. | Taisaku GOMYO, Hitoshi ASANO, Haruhiko OHTA, Yasuhisa SHINMOTO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Toshiharu OKA, Toshiyuki TOMOBE, Koushiro USUKU, Masaki SHIMADA, Masahiro TAKAYANAGI, Satoshi MATSUMOTO, Takashi KURIMOTO, Hidemitsu TAKAOKA, Michito SAKAMOTO, Atsushi OKAMOTO, Kenichiro SAWADA, Haruo KAWASAKI, Development of Boiling and Two-Phase Flow Experiments on Board ISS (Void Fraction Characteristics in the Observation Section just at the Downstream of the Heating Section), International Journal of Microgravity Science Application, The Japan Society of Microgravity Application (JASMA), DOI: 10.15011/ijmsa.33.330104, 33, 1, 10 pages, 発行日: 2016/01/31, 2016.01. |
| 13. | Tomoki HIROKAWA, Daisuke YAMAMOTO, Daijiro YAMAMOTO, Yasuhisa SHINMOTO, Haruhiko OHTA, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Masahiro TAKAYANAGI, Satoshi MATSUMOTO, Takashi KURIMOTO, Hidemitsu TAKAOKA, Michito SAKAMOTO, Kenichiro SAWADA, Haruo KAWASAKI, Kiyosumi FUJII, Atsushi OKAMOTO, Kazumi KOGURE, Development of Boiling and Two-Phase Flow Experiments on Board ISS (Investigation on Performance of Ground Model), International Journal of Microgravity Science Application, The Japan Society of Microgravity Application (JASMA), DOI: 10.15011/ijmsa.33.330105, 33, 1, 9 pages, 発行日: 2016/01/31, 2016.01. |
| 14. | Kenichiro SAWADA, Takashi KURIMOTO, Atsushi OKAMOTO, Satoshi MATSUMOTO, Hidemitsu TAKAOKA, Haruo KAWASAKI, Masahiro TAKAYANAGI, Yasuhisa SHINMOTO, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Haruhiko OHTA, Development of Boiling and Two-Phase Flow Experiments on Board ISS (Dissolved Air Effects on Subcooled Flow Boiling Characteristics), International Journal of Microgravity Science Application, The Japan Society of Microgravity Application (JASMA), DOI: 10.15011/ijmsa.33.330106, 33, 1, 11 pages, 発行日: 2016/01/31, 2016.01. |
| 15. | Masaki OKUBO, Osamu KAWANAMI, Kotaro NAKAMOTO, Hitoshi ASANO, Haruhiko OHTA, Yasuhisa SHINMOTO, Koichi SUZUKI, Ryoji IMAI, Satoshi MATSUMOTO, Takashi KURIMOTO, Michito SAKAMOTO, Hidemitsu TAKAOKA, Kenichiro SAWADA, Atsushi OKAMOTO, Haruo KAWASAKI, Masahiro TAKAYANAGI, Kiyosumi FUJII, Development of Boiling and Two-phase Flow Experiments on Board ISS (Temperature Data Derivation and Image Analysis of a Transparent Heated Short Tube in the Glass Heated Section), International Journal of Microgravity Science Application, The Japan Society of Microgravity Application (JASMA), DOI: 10.15011/ijmsa.33.330107, 33, 1, 7 pages, 発行日: 2016/01/31, 2016.01. |
| 16. | Haruhiko Ohta, Yasuhisa Shinmoto, Keisuke Iwata and Daisuke Yamamoto, "Characteristics of Cooling by Nucleate Boiling of Immiscible Mixtures", Proceedings of Thermal Engineering Conference 2015, 2 pages, 24 Oct., 2015.. |
| 17. | Haruhiko OHTA, Keisuke IWATA, Daisuke YAMAMOTO, Yasuhisa SHINMOTO, Superior Heat Transfer Characteristics in Boiling of Immiscible Mixtures, Proceedings of the 26th International Symposium on Transport Phenomena (ISTP-26), No.89, UFD 8 pages, 2015.09. |
| 18. | Tomoki HIROKAWA, Seigo NAKAJIMA, Nattapat THANITCUL, Yasuhisa SHINMOTO, Haruhiko OHTA, "Characterristics of Evaporative Heat Transfer to Shear-driven Liquid Film Flow for the Development of Space Thermal Management Systems", Proceedings of Symposium on Multiphase Flow 2015, The Japanese Scoety for Multiphase Flow (JSMF), A143 (UFD 2 pages), 4 Aug., 2015.. |
| 19. | Masaki OKUBO, Kotaro NAKAMOTO, Osamu KAWANAMI, Hitoshi ASANO, Yasuhisa SHINMOTO, Haruhiko OHTA, Takashi KURIMOTO, Satoshi MATSUMOTO, "Experimental Study of DNB Trigger Mechanism under Forced Convective Boiling Condition", Proceedings of Symposium on Multiphase Flow 2015, The Japanese Scoety for Multiphase Flow (JSMF), A144 (UFD 2 pages), 4 Aug., 2015.. |
| 20. | Taisaku GOMYO, Hitoshi ASANO, Haruhiko OHTA, Yasuhisa SHINMOTO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Satoshi MATSUMOTO, Takashi KURIMOTO, "Effect of Gravity on Void Fraction of One-Component Gas-liquid Two-phase Flow", Proceedings of Symposium on Multiphase Flow 2015, The Japanese Scoety for Multiphase Flow (JSMF), A151 (UFD 2 pages), 4 Aug., 2015.. |
| 21. | Yusuke YAMASAKI, Shota KITA, Keisuke IWATA, Yasuhisa SHINMOTO, Haruhiko OHTA, Heat Transfer in Boiling of Immiscible Mixtures, Interfacial Phenomena and Heat Transfer, Begell House (International Journal of Interfacial Phenomena and Heat Transfer from Macro‐ to Nano‐ Scale Systems), 10.1615/InterfacPhenomHeatTransfer.2015012699 , 3, 1, 19-39, 2015.07, Boiling of immiscible mixtures is studied to realize high-performance cooling systems which satisfy the requirements for the increase in the heat generation density of semiconductors. Because immiscible mixtures are not employed as cooling mediums in the existing systems, fundamental heat transfer characteristics in pool boiling are summarized based on the experiments performed so far by the present authors, and their possibility for application to flow boiling is studied experimentally. The flow patterns composed of two immiscible liquids with different densities and surface tensions show complicated behaviors, even under unheated conditions. By evaluation of the temperature transition in the bulk flow during the evaporation of two component liquids, the heat transfer performance is discussed for immiscible mixtures with different compositions.. |
| 22. | Taisaku GOMYO, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Takashi KURIMOTO, Satoshi Matsumoto, Yasuhisa SHINMOTO, Tomoki HIROKAWA, Haruhiko OHTA, Void Fraction Characteristics and Flow Patterns of One Component Gas-Liquid Two-Phase Flow, International Topical Team Workshop (ITTW 2014), Book of Abstruct; The 9th International Conference on TWO-PHASE SYSTEMS FOR GROUND AND SPACE APPLICATIONS, 2014.09. |
| 23. | Takashi KURIMOTO, Satoshi Matsumoto, Haruo KAWASAKI, Kenichiro SAWADA, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Yasuhisa SHINMOTO, Haruhiko OHTA, Introduction and Status of hardware and development for Boiling and Two-Phase Experiments onboard ISS/Kibo, International Topical Team Workshop (ITTW 2014), Book of Abstruct; The 9th International Conference on TWO-PHASE SYSTEMS FOR GROUND AND SPACE APPLICATIONS, 2014.09. |
| 24. | Tomoki HIROKAWA, Masahiko MUROZONO, Yasuhisa SHINMOTO, Oleg KABOV, Haruhiko OHTA, Experimental Investigation of Heat Transfer Characteristics Due to Evaporation of Shear-driven Liquid Film Flow, International Topical Team Workshop (ITTW 2014), Book of Abstruct; The 9th International Conference on TWO-PHASE SYSTEMS FOR GROUND AND SPACE APPLICATIONS, 2014.09. |
| 25. | Tomoki HIROKAWA, Yuichiro HARA, Masahiko MUROZONO, Yasuhisa SHINMOTO and Haruhiko OHTA, "Heat transfer characteristics of shear-driven liquid film flow for the development of space thermal management systems", Proceedings of Symposium on Multiphase Flow 2014, The Japanese Scoety for Multiphase Flow (JSMF), UFD 2 pages, July 28-30, 2014. . |
| 26. | Osamu KAWANAMI, Tomotaka IMAI, Masaki OHKUBO, Hitoshi ASANO, Yasuhisa SHINMOTO, Haruhiko OHTA, Ryoji IMAI, Takashi KURIMOTO and Satoshi MATSUMOTO, "Boiling heat transfer and flow behavior in a tube with short heated length", Proceedings of Symposium on Multiphase Flow 2014, The Japanese Scoety for Multiphase Flow (JSMF), UFD 2 pages, July 28-30, 2014. . |
| 27. | Tomoki HIROKAWA, Masahiko MUROZONO, Yasuhisa SHINMOTO, Haruhiko OHTA, Oleg KABOV, Heat Transfer Characteristics due to Evaporation of Shear-driven Liquid Film Flow, International Heat Transfer Symposium 2014 (IHTS2014), IHTS140163, UFD 8 pages, 2014.05. |
| 28. | Taisaku GOMYO, Hitoshi ASANO, Haruhiko OHTA, Yasuhisa SHINMOTO, Osamu KAWANAMI, Takushi KURIMOTO, Masahito KOMASAKI and Satoshi MATSUMOTO, "Void Fraction Characterisics and Flow Patterns of One-Component Gas-Liquid Two-Phase Flow", Japanese Journal Multiphase Flow, Vol. 27(5), pp.547-554, March, 2014. (19 May, 2014 online), [URL]. |
| 29. | Seita KIUCHI, Tomoki HIROKAWA, Takahiro HAYASHIDA, Yasuhisa SHINMOTO, Masahiko MUROZONO, Haruhiko OHTA, Heat Transfer Characteristics due to the Evaporation and Boiling of Thin Liquid Film in the Presence of Co-current Gas Flow, The 24th International Symposium on Transport Phenomena (ISTP-24), 2013.11, In recent years, the density of dissipated heat from a semiconductor chip tends to increase continuously. As a consequence, the limited cooling ability by the application of conventional air or liquid cooling method disturbs the development of electronic devices. Therefore, the powerful cooling technology by the application of phase change becomes necessary. Especially, forced convective boiling attracts much attention for the cooling of semiconductor chips or power electronics. The application of two-phase system decreases the temperature difference during the evaporation and condensation processes, and almost no additional temperature difference is needed for the transportation of waste heat from the evaporator to the condenser. In nucleate boiling and two-phase forced convection, the formation and the transition of liquid film underneath bubbles or around the vapor core flow becomes a key factor which determines the enhancement of heat transfer. The behavior of liquid film, however, cannot be controlled at will to obtain further enhancement of heat transfer, but is determined uniquely under given flow and heating conditions. On the other hand, the behaviors of the liquid film flowing in the presence of gas flow can be controlled directly by the adjustment of the gas velocity via the interfacial shear stress between both phases and by the thermal power supplied to the film.. |
| 30. | Yuta FUKUYAMA, Akito KAWAKUBO, Yasuhisa SHINMOTO, Haruhiko OHTA, Masahide SATO, Ken-ichi IIMURA, Masato FUKAGAYA, Yoshiyuki ABE, Development of Cooling System for Data Servers using Flow Boiling of Nanofluid, The 24th International Symposium on Transport Phenomena (ISTP-24), 2013.11, Along the advances in electronic technology, the heat generation density from data servers is increasing rapidly. Existing cooling systems for data servers, which consist of built-in cooling fan arrays and air conditioners installed in the server room, however, cannot meet cooling requirements in the near future. Furthermore, these systems require huge power as much as 40-50% of that consumed in the data center for the operation of air conditioners. A new cooling system proposed here applies flow boiling for the direct transport of the waste heat from the server racks to the air outside of the building. Nucleate boiling removes a large amount of waste heat by a small temperature difference, and the temperature of two-phase flow is kept almost constant during its transportation provided that the pressure drop is negligible. Therefore, the method will become a powerful means to promote the energy conservation. This study reports the cooling performance for the boiling of nanofluid in a devised cooling jacket attached to the heaters with the same size and the same power generation as those of typical semiconductors.. |
| 31. | Taisaku GOMYO, Hitoshi ASANO, Yuuki KANAI, Yasuhisa SHINMOTO, Haruhiko OHTA, Osamu KAWANAMI, Haruo KAWASAKI, Ryoji IMAI, Koichi SUZUKI, Kiyosumu FUJI, Preliminary Tests on Two-Phase Flow Visualization and Measurement for Two-Phase Flow Loop Experiment in International Space Station, Seventh International Conference on Two-phase Systems for Ground and Space Applications, 62, (Beijing, China, 17-22, Sep. 2012), 2012.09. |
| 32. | Mayumi Ouchi, Yoshiyuki Abe, Masato Fukagaya, Haruhiko Ohta, Yasuhisa Shinmoto, Masahide Sato, Ken Ichi Iimura, Thermal management systems for data centers with liquid cooling technique of CPU, 13th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2012 Proceedings of the 13th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2012, 10.1109/ITHERM.2012.6231507, 790-798, 2012.09, Energy consumption in data centers has seen a drastic increase in recent years and approximately 40% of it is spent on cooling facilities. In data centers, server racks are cooled down indirectly by chilled air with an air conditioner. This technique is inefficient because IT equipment is not cool enough whereas the server room is overcooled. Under these circumstances, the authors have proposed liquid cooling systems in which CPUs are cooled down directly and exhaust heat is not radiated into the server room. Three cooling technique for CPUs are developed simultaneously. Two of them involve a single-phase heat exchanger and a two-phase heat exchanger as a cooling jacket. The other is flat heat pipes in order that the heat generated by CPU is cooled after being transported to the outside of the chassis. Condensation section of the heat pipe is cooled down by liquid with liquid manifold, so that there is no air cooling part in our new liquid cooling systems. Performance evaluation tests of the cooling devices have been conducted, which are single-phase heat exchanger, two-phase heat exchanger and two-types of flat heat pipes. Meanwhile, nanofluid technology for heat transfer enhancement and development of plug-in connectors for standardization of the systems are pursued. In addition, Verification tests have been carried out with using commercial servers. As a result, a 44% to 53% reduction in energy consumption of cooling facilities with single-phase cooling system was realized compared with conventional air cooling system.. |
| 33. | Mayumi OUCHI, Yoshiyuki ABE, Masato FUKAGAYA, Takashi KITAGAWA, Haruhiko OHTA, Yasuhisa SHINMOTO, Masahide SATO, Ken-ichi IIMURA, New thermal management systems for data centers, Journal of Thermal Science and Engineering Applications (TSEA), ASME, 10.1115/1.4006478, 4, 3, (J. Thermal Sci. Eng. Appl. Vol.4, Issue 3, 031005, 10 pages, 16 Jul., 2012.) (History: Received June 12, 2011; Accepted March 14, 2012; Published July 16, 2012; Online July 16, 2012) (Transaction: 031005-1-031005-10, September, 2012.), 2012.07, [URL], Energy consumption in data centers has seen a drastic increase in recent years. In data centers, server racks are cooled down in an indirect way by air-conditioning systems installed to cool the entire server room. This air cooling method is inefficient as information technology (IT) equipment is insufficiently cooled down, whereas the room is overcooled. The development of countermeasures for heat generated by IT equipment is one of the urgent tasks to be accomplished. We, therefore, proposed new liquid cooling systems in which IT equipment is cooled down directly and exhaust heat is not radiated into the server room. Three cooling methods have been developed simultaneously. Two of them involve direct cooling; a cooling jacket is directly attached to the heat source (or CPU in this case) and a single-phase heat exchanger or a two-phase heat exchanger is used as the cooling jacket. The other method involves indirect cooling; heat generated by CPU is transported to the outside of the chassis through flat heat pipes and the condensation sections of the heat pipes are cooled down by coolant with liquid manifold. Verification tests have been conducted by using commercial server racks to which these cooling methods are applied while investigating five R&D components that constitute our liquid cooling systems: the single-phase heat exchanger, the two-phase heat exchanger, high performance flat heat pipes, nanofluid technology, and the plug-in connector. As a result, a 44–53% reduction in energy consumption of cooling facilities with the single-phase cooling system and a 42–50% reduction with the flat heat pipe cooling system were realized compared with conventional air cooling system.. |
| 34. | Soumei BABA, Osamu KAWANAMI, Kenji SARUWATARI, Hitoshi ASANO, Yuuki KANAI, Yasuhisa SHINMOTO and Haruhiko OHTA, "Thermal Hydraulic Characteristics in a Two-phase Flow Loop Driven by Mechanical Pump under Microgravity", Japanese Journal Multiphase Flow, Vol. 25(5), pp.479-486, 19 Jun., 2012., [URL]. |
| 35. | Mayumi Ouchi, Yoshiyuki Abe, Masato Fukagaya, Ohta Haruhiko, Yasuhisa Shinmoto, Masahide Sato, Ken-ichi IIMURA, Thermal Management Systems for Data Centers with Liquid Cooling Technique of CPU, 13th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm 2012) , 790-798, 9 pages, 2012.05. |
| 36. | Kiyosumi FUJII, Masato KOMASAKI, Takashi KURIMOTO, Haruo KAWASAKI, Kenichiro SAWADA, Koichi SUZUKI, Hitoshi ASANO, Osamu KAWANAMI, Ryoji IMAI, Yasuhisa SHINMOTO, Haruhiko OHTA, Recent Progress in JAXA Project of Boiling Two-Phase Flow Experiment onboard ISS, Journal of Physical Science and Application, David Publishing Company, 2, 4, 71-79, 2012.04, [URL]. |
| 37. | Tomoki HIROKAWA, Somei BABA, Nobuo OTANI, Hitoshi ASANO, Osamu KAWANAMI, Koich SUZUKI, Haruo KAWASAKI, Ryoji IMAI, Yasuhisa SHINMOTO and Haruhiko OHTA, "Apparatus for Flow Boiling Experiments to be Performed onboard "KIBO"", Space Utilization Research, Vol.28, pp. 109-112, March 2012.. |
| 38. | Soumei BABA, Takashi SAKAI, Kenichiro SAWADA, Chisato KUBOTA, Yuto WADA, Yasuhisa SHINMOTO, Haruhiko OHTA, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Haruo KAWASAKI, Kiyosumi FUJII, Masahiro TAKAYANAGI, Shinichi YODA, Proposal of experimental setup on boiling two-phase flow on-orbit experiments onboard Japanese experiment module "KIBO", Journal of Physics: Conference Series, IOPscience (International Symposium on Physical Sciences in Space, 11–15 July 2011, Bonn, Germany), 10.1088/1742-6596/327/1/012055, 327, 012055, 12 pages, 2011.12, [URL]. |
| 39. | Chisato KUBOTA, Osamu KAWANAMI, Yuka ASADA, Yuto WADA, Tadashi NAGAYASU, Yasuhisa SHINMOTO, Haruhiko OHTA, Oleg KABOV, Patrick QUEECKERS, Sergey CHIKOV, Johannes STRAUB, Experiment on nucleate pool boiling in microgravity by using transparent heating surface – Analysis of surface heat Transfer Coefficients, Journal of Physics: Conference Series, IOPscience (International Symposium on Physical Sciences in Space, 11–15 July 2011, Bonn, Germany), 10.1088/1742-6596/327/1/012040, 327, 012040, 8 pages, 2011.12, [URL]. |
| 40. | Mayumi Ouchi, Yoshiyuki Abe, Masato Fukagaya, Takashi Kitagawa, Haruhiko Ohta, Yasuhisa Shinmoto, Masahide Sato, Ken Ichi Iimura, New thermal management systems for data centers, ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011, 2011.12, The almost half amount of power consumption in data centers which has been increasing drastically in late years is due to air conditioner for cooling down the data centers. The present authors proposed new thermal management systems for data centers aiming for the data centers without air conditioning, and R&D subjects have been conducted under the so called Green IT Project sponsored by NEDO (New Energy and Industrial Technology Development Organization). In this system, three liquid cooling methods for CPUs have been developed simultaneously, which are two types of direct liquid cooling with single-phase or two-phase heat exchanger and an indirect liquid cooling with high performance thin heat pipes. To establish this system, five R&D subjects have been conducted. In this paper, current progress of these subjects such as development of heat transfer components, verification test using real server racks, and nanofluids technology for heat transfer enhancement is reported.. |
| 41. | Nobuo OHTANI, Soumei BABA, Tomoki HIROKAWA, Yasuhisa SHINMOTO, Haruhiko OHTA, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Haruo KAWASAKI, Kiyosumi FUJII and Kenichiro SAWADA, Preliminary Ground Test for the Experiments on Boiling and Two-phase Flow onboard International Space Station, Proceedings of the 5th Kyushu Univ.-KAIST Symposium on Aerospace Engineering, Nobuo OHTANI, Soumei BABA, Tomoki HIROKAWA, Yasuhisa SHINMOTO, Haruhiko OHTA, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Ryoji IMAI, Haruo KAWASAKI, Kiyosumi FUJII and Kenichiro SAWADA, "Preliminary Ground Test for the Experiments on Boiling and Two-phase Flow onboard International Space Station", Proceedings of the 5th Kyushu Univ.-KAIST Symposium on Aerospace Engineering, pp.28-31, 2011., 2011.11. |
| 42. | Hiroyuki KOBAYASHI, Kazutoshi KAJIMOTO, Shohei KANAZAWA, Yasuhisa SHINMOTO, Haruhiko OHTA, Flow Boiling Experiments in Narrow Channels Between Fins under High Heat Flux Conditions for cooling of Electronic Devices, Seventh Interdisciplinary Transport Phenomena Conference (ITP-2011): Fluid, Thermal, Biological, Materials and Space Sciences , XII-10-XII-17, 2011.09. |
| 43. | Mayumi OUCHI, Yoshiyuki ABE, Masato FUKAGAYA, Haruhiko OHTA, Yasuhisa SHINMOTO, Masahide SATO, Ken-ichi IIMURA, Liquid Cooling Network Systems for Energy Conservation in Data Centers, ASME 2011 InterPACK Conference (IPACK2011), 10.1115/IPACK2011-52066, 443-449, 2011.07. |
| 44. | Haruo KAWASAKI, Kiyosumi FUJII, Kenichiro SAWADA, Takashi SAKAI, Soumei BABA, Yasuhisa SHINMOTO, Osamu KAWANAMI, Hitoshi ASANO, Ryouji IMAI and Koichi SUZUKI and Haruhiko OHTA, Ground Test Loop for Interfacial Behaviors and Heat Transfer Characteristics in Boiling Two Phase Flow (JEM-TPF), The 41st International Conference on Environmental Systems: AIAA, 2011.07. |
| 45. | Chisato KUBOTA, Kenichiro SAWADA, Yuto WADA, Osamu KAWANAMI, Hitoshi ASANO, Koichi SUZUKI, Haruo KAWASAKI, Kiyosumi FUJII, Ryoji IMAI, Yasuhisa SHINMOTO and Haruhiko OHTA, Ground Test on Boiling Two-phase Flow Prepared for the Experiments onboard International Space Station, Proceedings of the 28th International Symposium on Space Technology and Science （ISTS), Chisato KUBOTA, Kenichiro SAWADA, Yuto WADA, Osamu KAWANAMI, Hitoshi ASANO, Koichi SUZUKI, Haruo KAWASAKI, Kiyosumi FUJII, Ryoji IMAI, Yasuhisa SHINMOTO and Haruhiko OHTA, "Ground Test on Boiling Two-phase Flow Prepared for the Experiments onboard International Space Station", Proceedings of the 28th International Symposium on Space Technology and Science, 2011-h-31, UFD, 4 Pages, 2011., 2011.06. |
| 46. | Kiyosumi FUJII, Haruo KAWASAKI, Koichi SUZUKI, Hitoshi ASANO, Osamu KAWANAMI, Ryoji IMAI, Yasuhisa, SHINMOTO and Haruhiko OHTA, A Report of a Current Status of an International Space Station "KIBO" Project "Interfacial Behaviors and Heat Transfer Characteristics in Boiling Two Phase Flow, Proceedings of the 28th International Symposium on Space Technology and Science (ISTS), Kiyosumi FUJII, Haruo KAWASAKI, Koichi SUZUKI, Hitoshi ASANO, Osamu KAWANAMI, Ryoji IMAI, Yasuhisa, SHINMOTO and Haruhiko OHTA, "A Report of a Current Status of an International Space Station "KIBO" Project "Interfacial Behaviors and Heat Transfer Characteristics in Boiling Two Phase Flow", Proceedings of the 28th International Symposium on Space Technology and Science, 2011-h-30, UFD, 6 pages, 2011., 2011.06. |
| 47. | Mayumi Ouchi, Yoshiyuki Abe, Masato Fukagaya, Haruhiko Ohta, Yasuhisa Shinmoto, Masahide Sato and Ken-ichi Iimura, Liquid Cooling Network System for Energy Conservation in Data Centers, Proceedings of the International Conference on Electronics Packaging (ICEP-2011), Japan Institute of Electronics Packaging, Mayumi Ouchi, Yoshiyuki Abe, Masato Fukagaya, Haruhiko Ohta, Yasuhisa Shinmoto, Masahide Sato and Ken-ichi Iimura, "Liquid Cooling Network System for Energy Conservation in Data Centers", Proceedings of the International Conference on Electronics Packaging (ICEP-2011), Japan Institute of Electronics Packaging, DVD-ROM 6 pages (pp.359-364), 2011.4., 2011.04. |
| 48. | Yasuhisa Shinmoto, Yuka Asada, Hiroyuki Kobayashi, Shohei Kanazawa, Haruhiko Ohta, Masato Fukagaya, Yoshiyuki Abe, Mayumi Ouchi, Masahide Sato and Ken-ichi Iimura, Development of High Heat Flux Cooling Jacket for Electronics Devices by using Flow Boiling, Proceedings of the International Conference on Electronics Packaging (ICEP-2011), Japan Institute of Electronics Packaging, Yasuhisa Shinmoto, Yuka Asada, Hiroyuki Kobayashi, Shohei Kanazawa, Haruhiko Ohta, Masato Fukagaya, Yoshiyuki Abe, Mayumi Ouchi, Masahide Sato and Ken-ichi Iimura, "Development of High Heat Flux Cooling Jacket for Electronics Devices by using Flow Boiling", Proceedings of The International Conference on Electronics Packaging (ICEP-2011), Japan Institute of Electronics Packaging, DVD-ROM 6 pages (pp.148-153), 2011.4., 2011.04. |
| 49. | Chisato KUBOTA, Osamu KAWANAMI, Yuka ASADA, Yuto WADA, Tadashi NAGAYASU, Yasuhisa SHINMOTO, Haruhiko OHTA, Oleg KABOV, Patrick QUEECKERS, Sergey Chikov and Johannes STRAUB, "Aircraft Experiments on Nucleate Pool Boiling Heat Transfer in Microgravity by Using Transparent Heating Surface", Proceedings of The Twenty-seventh Space Utilization Symposium, Space Utilization Research, Vol. 27, pp. 90 - 93, 2011.. |
| 50. | Soumei BABA, Takashi SAKAI, Kenichiro SAWADA, Chisato KUBOTA, Yuto WADA, Hitoshi ASANO, Osamu KAWANAMI, Koichi SUZUKI, Haruo KAWASAKI, Kiyosumi FUJII, Ryoji IMAI, Yasuhisa SHINMOTO and Haruhiko OHTA, "Ground Test using BBM for the Experiment of Boiling Two-phase Flow onboard Japanese Experiment Module “KIBO"", Proceedings of The Twenty-seventh Space Utilization Symposium, Space Utilization Research, Vol. 27, pp. 94 - 97, 2011.. |
| 51. | Mayumi Ouchi, Yoshiyuki Abe, Masato Fukagaya, Takashi Kitagawa, Yasuhisa SHINMOTO, Haruhiko OHTA, Masahide Sato, Ken-ichi Iimura, New Thermal Management Systems for Data Centers, Proceedings of the ASME/JSME 2011 8th Thermal Engineering Joint Conference (AJTEC2011), 10.1115/AJTEC2011-44399, Mayumi Ouchi, Yoshiyuki Abe, Masato Fukagaya, Takashi Kitagawa, Haruhiko Ohta, Yasuhisa Shinmoto, Masahide Sato and Ken-ichi Iimura, "New Thermal Management Systems for Data Centers", ASME/JSME 2011 8th Thermal Engineering Joint Conference (AJTEC2011), AJTEC2011-44399, CD-ROM 6 pages, 2011.3., 2011.03, The almost half amount of power consumption in data centers which has been increasing drastically in late years is due to air conditioner for cooling down the data centers. The present authors proposed new thermal management systems for data centers aiming for the data centers without air conditioning, and R&D subjects have been conducted under the so called Green IT Project sponsored by NEDO (New Energy and Industrial Technology Development Organization). In this system, three liquid cooling methods for CPUs have been developed simultaneously, which are two types of direct liquid cooling with single-phase or two-phase heat exchanger and an indirect liquid cooling with high performance thin heat pipes. To establish this system, five R&D subjects have been conducted. In this paper, current progress of these subjects such as development of heat transfer components, verification test using real server racks, and nanofluids technology for heat transfer enhancement is reported.. |
| 52. | Haruo Kawasaki, Kiyosumi Fujii, Kenichiro Sawada, Takashi Sakai, Soumei Baba, Yasuhisa Shinmoto, Osamu Kawanami, Hitoshi Asano, Ryouji Imai, Koichi Suzuki, Haruhiko Ohta, Ground test loop for Interfacial behaviors and heat transfer characteristics in boiling two phase flow (JEM-TPF), 41st International Conference on Environmental Systems 2011, ICES 2011 41st International Conference on Environmental Systems 2011, ICES 2011, 2011. |
| 53. | Kazutoshi KAJIMOTO, Shinichi MIURA, Hiroyuki KOBAYASHI, Yasuhisa SHINMOTO and Haruhiko OHTA, Flow Boiling Heat Transfer Characteristics in Narrow Channels between Fins, Proceedings of the 21st International Symposium Transport Phenomena (ISTP-21), pp. 866-872, 2010.11. |
| 54. | Takashi SAKAI, Shinsaku YOSHII, Kazutoshi KAJIMOTO, Hiroyuki KOBAYASHI, Yasuhisa SHINMOTO, Haruhiko OHTA, Heat Transfer Enhancement Observed in Nucleate Boiling of Alcohol Aqueous Solutions at Very Low Concentration, Proceedings of the International Heat Transfer Conference (IHTC-14), 10.1115/IHTC14-22737, 471-478, 2010.08. |
| 55. | Yoshiyuki ABE, Mayumi OUCHI, Masato FUKAGAYA, Takashi KITAGAWA, Haruhiko OHTA, Yasuhisa SHINMOTO, Masahide SATO, Ken-ichi IMURA, Development of Advanced Cooling Network Systems for Data Centers, Proceedings of the International Heat Transfer Conference (IHTC-14), 10.1115/IHTC14-22045, 425-430, 2010.08. |
| 56. | Development of Cooling System for a Large Area under High Heat Flux Conditions by Using Flow Boiling in Fin Spacing Narrow Channels, Shinichi MIURA, Shinsaku YOSHII, Yasuhisa SHINMOTO and Haruhiko OHTA, Journal of The Japan Society of Microgravity Application, Vol. 27 No. 2, pp. 65 - 76, April, 2010.. |
| 57. | Takashi SAKAI, Yuuki TSUKINARI, Shinsaku YOSHII, Kazutoshi KAJIMOTO, Yasuhisa SHINMOTO and Haruhiko OHTA, Nucleate Boiling Heat Transfer in Alcohol Aqueous Solutions, Interdisciplinary Transport Phenomena VI: Fluid, Thermal, Biological, Materials and Space Sciences (ITP 2009), 2009.10. |
| 58. | Osamu KAWANAMI, Haruhiko OHTA, Oleg KABOV, Yoshino SAKATA, Yusuke KOTANI, Yuka ASADA, Tadashi NAGAYASU, Yasuhisa SHINMOTO, Sergey CHIKOV, Patrick QUEECKERS and Johannes STRAUB, Heat Transfer and Bubble Behaviors in Microgravity Pool Boiling in ESA Parabolic Flight Experiment, Microgravity Science and Technology, An International Journal for Microgravity and Space Exploration Related Research, Vol.21, pp. S3-S8, Microgravity Science and Technology, An International Journal for Microgravity and Space Exploration Related Research, Vol. 21(1), pp. S3-S8, Auguest, 2009., 2009.08. |
| 59. | Osamu Kawanami, Haruhiko Ohta, Oleg Kabov, Yoshino Sakata, Yusuke Kotani, Yuka Asada, Tadashi Nagayasu, Shinmoto Yasuhisa, Sergey Chikov, Patrick Queeckers, Johannes Straub, Heat transfer and bubble behaviors in microgravity pool boiling in esa parabolic flight experiment, Microgravity Science and Technology, 10.1007/s12217-009-9150-8, 21, SUPPL. 1, 2009.08, To clarify the relation between local heat transfer and bubble behaviors in pool boiling under microgravity conditions, a transparent heating surface, which has multiple array of heaters and temperature sensors, and experimental apparatus were developed to make the measurement of local heat transfer characteristics and the observation of liquid-vapor behavior simultaneously possible. In this paper, preliminary results of the microgravity pool boiling experiments conducted in ESA 49th parabolic flight campaign were reported. It was found that the bubble behaviors were strongly affected by the fluctuation of gravity in low-gravity period, and the effect of gravity on the bubble behaviors and heat transfer was dependent on the liquid subcooling. In the case of high subcooling, boiling bubbles were pushed on to the heating surface during positive low-g, and heat transfer due to microlayer evaporation was enhanced. On the other hand, during negative low-g period, bubbles detached from the heating surface, and the heat transfer rate was decreased. This trend, however, completely inverted at low subcooling. In positive low-g, the heat transfer was deteriorated because the dry patch was extended on the heating surface.. |
| 60. | , [URL]. |
| 61. | Yasuhisa SHINMOTO, Shinichi MIURA, Koich Suzuki, Yoshiyuki Abe, Haruhiko OHTA, Development of Advanced High Heat Flux Cooling System for Power Electronics, ASME 2009 InterPACK Conference(IPACK2009), 10.1115/InterPACK2009-89082, 283-292, Proceedings of InterPACK’09, IPACK2009-89082, DVD-ROM 10 pages, 2009. ASME 2009 InterPACK Conference, IPACK2009, July 19-23, 2009, San Francisco, California, USA, 2009.07, [URL]. |
| 62. | Yoshiyuki Abe, Masato Fukagaya, Takashi Kitagawa, Haruhiko OHTA, Yasuhisa SHINMOTO, Masahide Sato, Ken-ichi Iimura, Advanced Integrated Cooling Systems for Thermal Management in Data Centers, ASME 2009 InterPACK Conference (IPACK2009), 10.1115/InterPACK2009-89009, 619-624, Proceedings of InterPACK’09, IPACK2009-89009, DVD-ROM 6 pages, July, 2009. ASME 2009 InterPACK Conference, IPACK2009, July 19-23, 2009, San Francisco, California, USA, 2009.07. |
| 63. | Shinichi MIURA, Yukihiro INADA, Yasuhisa SHINMOTO, Haruhiko OHTA, Development of Cooling System for a Large Area at High Heat Flux by using Flow Boiling in Narrow Channels, International Conference on Nanochannels, Microchannels and Minichannels (ICNMM2009), 10.1115/ICNMM2009-82279, 287-294, Proceedings of 7th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2009-82279, CD-ROM 8 pages, June, 2009. June 22-24, 2009, Pohang, South Korea at the POSTECH - Pohang University of Science and Technology, Pohang, South Korea., 2009.06. |
| 64. | Masahide SATO, Tomohiro SUZUKI, Roberto DI PAOLA, Yuuki URITA, Anselmo CECERE, Raffaele SAVINO, Yoshiyuki ABE, Ken-ichi IIMURA, Yasuhisa SHINMOTO, Haruhiko OHTA and Masato FUKAGAYA , Anomalous Temperature Dependence of the Surface Tension in Polyol Process- Synthesized Silver Nanofluids with Higher Alcohols, The 17th Symposium on Thermophysical Properties, Proceedings of 17th Symposium on Thermophysical Properties, CD-ROM 5 pages, June, 2009, 2009.06. |
| 65. | Shinichi MIURA, Yukihiko INADA, Yasuhisa SHINMOTO, Haruhiko OHTA, Development of High Performance Cooling Devices for Space Application by using Flow Boiling in Narrow Channels, Interdisciplinary Transport Phenomena, Annals of New York Academy of Sciences, 10.1111/j.1749-6632.2009.04082.x, Vol.1161, Issue 1, 192-201, Shinichi MIURA, Yukihiko INADA, Yasuhisa SHINMOTO and Haruhiko OHTA, "Development of High Performance Cooling Devices for Space Application by using Flow Boiling in Narrow Channels", Interdisciplinary Transport Phenomena, Annals of New York Academy of Sciences, Vol. 1161, Issue 1, pp. 192-201, Apr., 2009. （Proceedings of Interdiscipliary Transport Phenomena V : Fluid, Thermal, Biological, Materials and Space Sciences (2007), pp. 7-32 - 7-39, 2007. ITP 2007 Bansko, BULGARIA）, 2009.04. |
| 66. | Shinichi MIURA, Kenta HARA, Yasuhisa SHINMOTO and Haruhiko OHTA, "High Efficiency Cooling for Flow Boiling in Narrow Channels by Improved Liquid Supply", Progress in Multiphase Flow Research, Vol. 4, pp.53-60, Apr., 2009., [URL]. |
| 67. | Yukihiro INADA, Shinichi MIURA, Kenta HARA, Yasuhisa SHINMOTO, Haruhiko OHTA, Development of Heated Narrow Channels with Enhanced Liquid Supply in Forced Convective Boiling, Journal of The Japan Society of Microgravity Application (JASMA), 25, 3, 321-326, 2008.08, [URL]. |
| 68. | Yoshino SAKATA, Shota AKAGI, Sayuri YOSHIOKA, Yasuhisa SHINMOTO and Haruhiko OHTA, Proposal of Experiments for the Clarification of Heat Transfer Mechanisms in Microgravity Nucleate Boiling, Proceedings of 26th International Symposium on Space Technology and Science (26th ISTS), 2008-h-27, CD-ROM, 5 pages, June, 2008, 2008.06. |
| 69. | Yuhki TSUKINARI, Takashi SAKAI, Yasunori ITO, Yasuhisa SHINMOTO and Haruhiko OHTA, Development of High-performance Space Thermal Management System using Nucleate Boiling of Alcohol Aqueous Solutions, Proceedings of 26th International Symposium on Space Technology and Science (26th ISTS), 2008-h-33, CD-ROM, 4 pages, June, 2008, 2008.06. |
| 70. | Cooling of Large Area for Flow Boiling in Narrow Channels by Improved Liquid Supply, Shinichi MIURA, Yukihiro INADA, Yasuhisa SHINMOTO and Haruhiko OHTA, Progress in Multiphase Flow Research, The Japanese Society for Multiphase Flow, Vol.3, pp. 75-82, Apr., 2008.. |
| 71. | Haruhiko OHTA, Takashi SAKAI, Shigenori YAMAGUCHI, Yoshihiko ITO, Yasuhisa SHINMOTO, Yoshiyuki ABE, Nucleate Boiling of Low-Concentration Alcohol Aqueous Solutions for the Development of Thermal Management Systems in Space, International Journal for Microgravity Research and Applications, Microgravity Science and Technology, Springer, 10.1007/BF02915779, 19, 141-143, Vol.19, No.3-4, pp.141-143, October, 2007, 2007.10. |
| 72. | Shinichi MIURA, Yukihiko INADA, Yasuhisa SHINMOTO, Haruhiko OHTA, Development of High Performance Cooling Device for Space Application by Using Flow Boiling in Narrow Channels, Proceedings of Interdiscipliary Transport Phenomena V : Fluid, Thermal, Biological, Materials and Space Sciences, 7-32-7-39, 2007.10. |
| 73. | Yasuhisa SHINMOTO, Kanako ARIKI, Shinichi MIURA, Yukihiro INADA and Haruhiko OHTA, Increase in Critical Heat Flux for Flow Boiling in Devised Narrow Channels with Enhanced Liquid Supply, Proceedings of Sixth International Conference on Enhanced, Compact and Ultra-Compact Heat Exchangers: Science, Engineering and Technology , ECI CHE2007-0059, CD-ROM 8 pages pp. 425-432, September, 2007., 2007.09. |
| 74. | Yasuhisa SHINMOTO, Yosuke ISHIKAWA, Kanako ARIKI and Haruhiko OHTA, "Critical Heat Flux in Cold Plates of Narrow Channels with Structures for Additional Liquid Supply", Progress in Multiphase Flow Research, The Japanese Society for Multiphase Flow, Vol.2, pp.117-124, 2007.. |
| 75. | Haruhiko OHTA, Yasuhisa SHINMOTO, Toshiyuki MIZUKOSHI, Yosuke ISHIKAWA, Structure of High-Performance Evaporators for Space Application, Interdisciplinary Transport Phenomena in the Space Sciences, Annals of the New York Academy of Science, Wiley-Blackwell, 10.1196/annals.1362.015, 1077, 668-679, 2006.09. |
| 76. | Haruhiko Ohta, Yasuhisa Shinmoto, Yosuke Ishikawa, Kanako Ariki, High Heat Flux Cooling of Large Areas by Improved Liquid Supply for Flow Boling in Narrow Channels, 13th International Heat Transfer Conference, IHTC-13, CD-ROM, BOI-32, 12 pages, 2006.08. |
| 77. | Haruhiko OHTA, Toshiyuki Mizukoshi, Takeyuki Yoshida, Yasuhisa SHINMOTO, Fundamental experiments for the development of high-performance cold plates in a feasability study on space solar power system, Microgravity - Science and Technology, Springer Netherlands, 10.1007/BF02872091, 17, 3, 75-81, Springer Netherlands, Vol.17, No.3, pp.75-81 (Microgravity Science and Technology, Vol.16, 2005), 2005.09. |
| 78. | Haruhiko OHTA, Yasuhisa SHINMOTO, Toshiyuki MIZUKOSHI, Yosuke ISHIKAWA, Structure of High-Performance Evaporators for Space Application, Proceedings of the Interdisciplinary Transport Phenomena, In Microgravity and Space Sciences Conference IV, ECI-ITP-05-15, CD-ROM 8 pages, 2005.08. |
| 79. | Haruhiko OHTA, Koichi SUZUKI, Yoshiyuki ABE, Hideo IWASAKI, Yasuhisa SHINMOTO, Hiroshi KAWAMURA, Experiments on the Development of Boiling Heat Exchangers for Cooling of a Large Area at High Heat Flux, Japan-US Seminar on Two-Phase Flow Dynamics, 1, 147-156, 2004.12. |
| 80. | Haruhiko Ohta, Haruo Kawasaki, Shinichi Toyama, Masahiro Mori, Shusaku Hirai, Sakae Saito, Naoki Morita, Toshiyuki Ohno, Makoto Higashijima, Yasuhisa Shinmoto, A study on the feasibility of heat transfer and transport from generator/transmitter combined units of assumed 10MW space solar power system, 4th International Conference on Solar Power from Space, SPS '04 - Together with The 5th International Conference on Wireless Power Transmission, WPT 5 European Space Agency, (Special Publication) ESA SP, 567, 257-262, 2004.12, Feasibility of heat transfer and transport is analyzed for the Space Solar Power System (SSPS) of an assumed 10MW power generation with an idealized generator/ transmitter combined structures. Diameter of the power satellite is 200m, where sunlight is condensed at a magnification of three to reduce the satellite size. Application of boiling and two-phase flow system is a promising method to transport a large amount of thermal energy because it accompanies the transportation of latent heat. The feasibility of thermal energy management was confirmed using boiling and two-phase flow for the 10MW class model, while the enlargement of the power up to 1GW is accompanied by the difficulty of heat removal with high heat generation density from a large area where no technology was developed yet including those for the terrestrial application. In the present research, performance of an example of thin cold plate was tested as a reference to evaluate the performance of cold plates to be developed for boiling and two-phase flow. In addition, a technique to increase the critical heat flux, which gives a limitation of heat removal, was tested and discussed on the basis of experimental results.. |
| 81. | Haruhiko OHTA, Yasuhisa SHINMOTO, Toshiyuki OHNO, Fumiaki HIOKI, Development of High-performance Boiling Heat Exchanger by Improved liquid Supply to Narrow Channels, Annals of the New York Academy of Sciences Vol. 1027, Transport phenomena in Microgravity, 10.1196/annals.1324.019, 1027, 217-234, 2004.11. |
| 82. | Yasuhisa SHINMOTO, Toshiyuki MIZUKOSHI, Takeyuki YOSHIDA, Haruhiko OHTA, "Experiments on Flow Boiling in Mini-channels for the Development of Space Cold Plates", Proceedings of the 8th Organized Multiphase Flow Forum 2004-Kumamoto - Multiphase Flow on Mini- and Micro-Scale - (OMF2004-Kumamoto), pp.57-62 (6 pages), 14 Oct., 2004. Kumamoto, Japan.. |
| 83. | Yasuhisa SHINMOTO, Toshiyuki OHNO, Haruhiko OHTA, Osamu OGAWA, Hiroya SHIDA, High Heat Flux Cooling by Forced Convective Boiling in Narrow Channels, 3rd International Symposium on Two-Phase Flow Modelling and Experimentation (ISTP 2004), CD-ROM 7 pages, 2004.09. |
| 84. | Haruhiko OHTA, Toshiyuki MIZUKOSHI, Takeyuki YOSHIDA, Yasuhisa SHINMOTO, Fundamental Experiments for the Development of High-Performance Cold Plates in a Feasibility Study on Space Solar Power System, Proceedings of the 7th Drop Tower Days and Catapult Presentation, 143-145, 2004.09. |
| 85. | Yasuhisa SHINMOTO, Toshiyuki OHNO, Takeyuki YOSHIDA, Haruhiko OHTA, A Method to Increase CHF for Forced Convective Boiling in Narrow Gaps Applied to Heat Sinks for Semiconductors with High Heat Generation Rate, The 1st International Symposium on Micro & Nano Technology (ISMNT-1), 2004.03. |
| 86. | Haruhiko OHTA, Yasuhisa SHINMOTO, Toshiyuki OHNO, Fumiaki HIOKI, Development of High-performance Boiling Heat Exchanger by Improved liquid Supply to Narrow Channels, 3rd Microgravity Transport Process in Fluid, Thermal, Biological and Materials Sciences, ECI: MTP-03-17, CD-ROM 12 pages, 2003.09. |
| 87. | Haruhiko OHTA, Toshiyuki OHNO, Fumiaki HIOKI, Yasuhisa SHINMOTO, Suppression of Burnout for Flow Boiling in Narrow Channels by Improved liquid Supply, Eurotherm seminar, 74th, Heat transfer in unsteady and transitional flows (Eurotherm 74), Technische Universiteit Eindhoven, 51-56, 2003.03. |
| 88. | Masaaki HIOKI, Toshiyuki OONO, Atsushi BABA, Haruo KAWASAK, Toshiyuki SUZUKI, Yasuhisa SHINMOTO and Haruhiko OHTA, "Increase of CHF in High-performance Space Heat Exchangers Using Boiling in Narrow Channels", JSME Thermal Engineering Division Meeting 2002, The Japan Society of Mechanical Engineers, No.02-22, A224, pp.297-298, 2002.. |
| 89. | Haruhiko OHTA, Toshiyuki OHNO, Fumiaki HIOKI, Yasuhisa SHINMOTO, Atsushi OKAMOTO, Development of High-performance Space Cold Plate by Improved Liquid Supply for Flow Boiling in Narrow Gaps, Proceedings of Drop Tower Days (DTD) 2002, No. 222, 137-142, 2002.11. |
| 90. | Haruhiko OHTA, Yasuhisa SHINMOTO, Toshiyuki OHNO, Atsushi OKAMOTO, Development of High-performance Space Cold Plate by Improved Liquid Supply for Flow Boiling in Narrow Gaps, Thermal Science and Engineering, Heat Transfer Sciety of Japan, 10, 6, 39-44, 2002.11. |
| 91. | Haruhiko OHTA, Yasuhisa SHINMOTO, Kazunori MATSUNAGA, Effect of Gravity on Flow Boiling in Narrow Ducts and Enhancement of CHF Values, Proceedings of the 12th International Heat Transfer Conference, 3, 725-730, 2002.08. |
| 92. | Koji Isogai, Shinmoto Yasuhisa, Study on aerodynamic mechanism of hovering insects, 19th AIAA Applied Aerodynamics Conference 2001 19th AIAA Applied Aerodynamics Conference, 2001.12, In order to clarify the fundamental mechanism of the hovering flight of a dragonfly, the numerical simulation of unsteady viscous flow around a tandem airfoil configuration oscillating in still air has been conducted by using a two-dimensional Navier-Stokes code. It is shown that the mutual flow interactions between the fore-and hind-airfoils are playing the dominant role in generating the time mean aerodynamic force acting in the direction of the stroke plane, which is indispensable for the dragonfly to hover with the body axis horizontal. The total amounts of the lifting force and the necessary power are also estimated and shown to be very close to those estimated by other researchers. Some additional numerical simulations and discussions are also presented to explain why a true hover-fly that has, in contrast with a dragonfly, only a pair of wings can also hover with the body axis horizontal.. |
| 93. | Haruhiko OHTA, Ryoichi KATAOKA, Shintaro MORIOKA, Yasuhisa SHINMOTO, Effect of Gravity on the Pressure Drop in Gas-liquid Two-phase Flow, ESA Publications Division (2001), FIRST INTERNATIONAL SYMPOSIUM ON MICROGRAVITY RESEARCH & APPLICATIONS IN PHYSICAL SCIENCES AND BIOTECHNOLOGY, VOLS I AND II, PROCEEDINGS, 454, 83-90, 2001.01. |
| 94. | H. Ohta, R. Kataoka, S. Morioka, Y. Shinmoto, Effect of gravity on the pressure drop in gas-liquid two-phase flow, 1st International Symposium on Microgravity Research and Applications in Physical Sciences and Biotechnology European Space Agency, (Special Publication) ESA SP, 454 I, 83-90, 2000.12, To clarify fundamentals of gravity effect on the behaviors in two-phase flow, experiments were conducted onboard aircraft. Annular flow of air-water mixture was realized independent of gravity level varying along a parabolic trajectory. Effect of gravity on the pressure drop was clarified systematically for vertical upward flow in a tube for different combinations of liquid and gas flow rates. Pressure drop becomes low when gravity is reduced, and the effect of gravity decreases with the increase of gas or liquid flow rate. The gravity effect was corresponded to the change of interfacial shear stress on the surface of annular liquid film, and a method to correlate the gravity effect on interfacial friction factor having direct influence on the pressure drop was introduced.. |
| 95. | Haruhiko OHTA, Yasuhisa SHINMOTO, Shintaro MORIOKA, Hiroaki TANOUCHI, Hiroshi FUJIYAMA, Liquid-vapor Behavior and Temperature Fluctuation near Dryout Point in Flow Boiling under Different Gravity Conditions, Proceedings of the 3rd European Thermal Science Conference 2000, pp.845-850, 10-13 September, 2000. Heidelberg, Germany, 1, 1, 845-850, 2000.09. |
| 96. | Koji Isogai, Yasuhisa Shinmoto , Numerical Study on Aerodynamic Mechanism of Hovering Flight of Dragonfly, Computational Fluid Dynamics 2000: Proceedings of the First International Conference on Computational Fluid Dynamics, Iccfd, Held at Kyoto, Japan, 10-14 July, 2000 , 259-264, pp.259-, 2000.07. |
| 97. | K. Isogai, Y. Shinmoto, Y. Watanabe, Effects of dynamic stall on propulsive efficiency and thrust of flapping airfoil, AIAA journal, 10.2514/2.589, 37, 10, 1145-1151, 1999.10, Numerical simulations of dynamic stall phenomena around an airfoil oscillating in a coupled mode, in which the pitching and heaving oscillations have some phase difference, have been performed with a Navier-Stokes code. The propulsive efficiency and the thrust have been calculated for various combinations of the phase difference and the reduced frequency for two different amplitude ratios. The effects of the dynamic stall phenomena on the behaviors of the propulsive efficiency and thrust are discussed in detail by examination of each flow pattern obtained. Highest efficiency has been observed for the case in which the pitching oscillation advances 90 deg ahead of the heaving oscillation and the reduced frequency is at some optimum value, for which there appears no appreciable flow separation in spite of large-amplitude oscillations. For phase angles and reduced frequency other than this best condition, efficiency is rapidly degraded by the occurrence of the large-scale leading-edge separation.. |
| 98. | Abstract;The paper presents an experimental verification of the theoretical analysis for thermally-induced structural responses of a rolled-blanket-type solar array subjected to sudden radiation heating such as typical night-day transition in orbit. Experiments were conducted using one-tenth model of asymmetric Flexible Rolled-Up Solar Array of the Hubble Space Telescope. The model was composed of a blanket, two flexible booms, and a rigid spreader bar. Time histories of tip deflections of two booms were measured. Quasistatic components of the deflections were in good agreement with the theoretically predicted results. Measured surface temperatures of the booms were also presented. (author abst.). |
| 99. | Proceedings of the 15th NAL Symposium on Aircraft Computational Aerodynamics, NAL SP-37. |
| 100. | Experimental Verification of Global Buckling of a Rolled Blanket Type Solar Array SHINMOTO Yasuhisa, MUROZONO Masahiko. |
| 101. | Koji Isogai, Yasuhisa Shinmoto, Effects of dynamic stall phenomena on. propulsive efficiency and thrust ofa flappingairfoil, AIAAPaper97-1926, Effects of dynamic stall phenomena on propulsive efficiency and thrust of a flapping airfoil Koji Isogai, Yasuhisa Shinmoto (Kyushu Univ., Fukuoka, Japan), and Yohachirou Watanabe (Mitsubishi Heavy Industries, Ltd., Nagasaki, Japan) AIAA-1997-1926 Fluid Dynamics Conference, 28th, Snowmass Village, CO, June 29-July 2, 1997 , 1997.04. |
| 102. | Numerical Simulation of Dynamic Stall Phenomena for an Airfoil Oscillating in Coupled Pitching and Heaving, Proceedings of the 14th NAL Symposium on Aircraft Computational Aerodynamics NAL SP-34. |
| 103. | Koji Isogai, Shinmoto Yasuhisa, Yohachirou Watanabe, Effects of dynamic stall phenomena on propulsive efficiency and thrust of a flapping airfoil, 28th Fluid Dynamics Conference, 1997 28th Fluid Dynamics Conference, 1997.01, Numerical simulation of dynamic stall phenomena around an airfoil oscillating in a coupled mode, where the pitching and heaving oscillations have some phase differences, has been performed using the Navier-Stokes code. The propulsive efficiency and the thrust have been calculated for various combinations of the phase difference and the reduced frequency for two different amplitude ratios, and the effects of the dynamic stall phenomena on the behaviors of the propulsive efficiency and thrust are discussed in detail by examining each flow pattern obtained. The highest efficiency has been observed for the case where the pitching oscillation advances 90 deg. ahead of the heaving oscillation, for which the flow separation is confined in the small region on the airfoil surface near the trailing edge in spite of the large amplitude oscillations. For phase angles other than 90 deg. the efficiency is degraded by the occurrence of the large scale leading edge separation.. |
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