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Development of Micro Heat-Transport Device Using Oscillation-Induced Heat-Transport Phenomena

Research Project

Project/Area Number 08455103
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionUniversity of Tokyo

Principal Investigator

NISHIO Shigefumi  University of Tokyo, Institute of Industrial Science, Professor, 生産技術研究所, 教授 (00111568)

Co-Investigator(Kenkyū-buntansha) SHIRAKASHI Ryo  University of Tokyo, Institute of Industrial Science, Lecturer, 生産技術研究所, 講師 (80292754)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1997: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1996: ¥4,800,000 (Direct Cost: ¥4,800,000)
KeywordsHeat Transport / Oscillation-Controlled Heat-Transport Tube / Dream Pipe / Heat Pipe / Micro Device / 熱輸送管 / 振動流 / 熱輸送限界 / マイクロシステム / ヒートシング
Research Abstract

The oscillation-controlled heat-transport device (OC-HTD) is suitable to develop the micro heat-transport devices. The type of OC-HTDs is the OC-HTD driven by an external oscillator (FDOC-HTD). In previous research, we have investigated the characteristics of FDOC-HTDs, but one of the remaining issues is their critical heat-transport rate (CHR) and the other is how to remove the external oscillator.
The most provable cause resulting in the CHR is the transition from laminar to turbulent oscillatory flow, and in this research the effects of the transition on the effective thermal conductivity of FDOC-HTD was experimentally investigated. The experimental results show that the transition does not result in a limitation of the effective thermal conductivity but produces an effective thermal conductivity higher than that predicted by the analysis assuming laminar oscillatory flow.
As for the issue removing the external oscillator, we focused on the meandering closed-loop heat-transport device (MCL-HTD) in which heating and cooling parts were connected with each other by a closed loop of tube meandering between them and operating liquid of a volume fraction was enclosed in the loop. Observation of fluid flow in the 10-turn MCL-HTD was conducted and it was found that a simple flow pattern appears at a high value of volume fraction of liquid. In such a condition, only two vapor plugs exist separately in adjacent turns, and one of them starts to grow when the other starts to shrink. When the latter plug disappears, a new vapor plug appears in the turn adjacent to the turn including the grown-up vapor plug. The vapor-plug propagation phenomena indicate that a kind of self-excited oscillation of liquid columns can be caused in MCL-HTDs if the number of turn is decreased.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 申興 泰: "振動制御型熱輸送管に関する研究(振動流の乱流遷移が及ぼす熱輸送特性への影響)" 日本機械学会論文集. 64巻・619B号. 890-896 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 細田 稔: "蛇行閉ループ式熱輸送デバイスに関する研究(気体プラグ伝播現象について)" 日本機械学会論文集. 64巻(掲載予定). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 西尾 茂文: "振動制御型熱輸送管に関する研究(層流崩壊条件とその熱輸送特性への影響)" 生産研究. 49巻・2号. 219-212 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hung-Tae SHIN: "Oscillation-Controlled Heat Transport Tube (Effects of Transition to Turbulent Oscillatory Flow on Heat Transport Characteristics)" Trans.JSME. Vol.64. 890-896 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Minoru HOSODA: "Study of Meandering Closed-Loop Heat-Transport Device (Vapor-Plug Propagation Phenomena)" Trans.JSME. Vol.64 (in print). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 申興泰・西尾茂文・呉性済・上村光宏: "振動制御型熱輸送管に関する研究(振動流の乱流遷移が及ぼす熱輸送特性への影響)" 日本機械学会論文集. 64巻・619B号(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 細田稔・西尾茂文・白樫了: "蛇行閉ループ式熱輸送デバイスに関する研究(気体プラグ伝播現象について)" 日本機械学会論文集. 64巻(掲載予定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 西尾茂文・申興泰・呉性済: "振動制御型熱輸送管に関する研究(層流崩壊条件とその熱輸送特性への影響)" 生産研究. 49巻、2号. 219-212 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 申興泰: "振動制御型熱輸送管に関する研究(加熱・冷却部における管内熱伝達率)" 日本機械学会論文集(B編). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 西尾茂文: "振動制御型熱輸送管に関する研究(層流崩壊条件とその熱輸送性能への影響)" 生産研究. 49・4. (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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