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Fundamental Research for the Development of Compact Cooling Systems Corresponding to Ultra High Heat Generation Density by Optimization of Boiling and Evaporation Conditions

Research Project

Project/Area Number 16360107
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

OHTA Haruhiko  Kyushu University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (50150503)

Co-Investigator(Kenkyū-buntansha) INOUE Koichi  Kyushu University, Faculty of Engineering, Assistant Professor, 大学院・工学研究院, 講師 (70380574)
SHINMOTO Yasuhisa  Kyushu University, Faculty of Engineering, Research Associate, 大学院・工学研究院, 助手 (30226352)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥12,500,000 (Direct Cost: ¥12,500,000)
Fiscal Year 2005: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2004: ¥10,100,000 (Direct Cost: ¥10,100,000)
Keywordsboiling / critical heat flux / narrow channel / microlayer / phase change / self-wetting / marangoni / heat transfer / センサー
Research Abstract

In order to obtain the fundamental and general knowledge of boiling heat transfer in the high-performance cooling systems, a few experiments with different approaches were conducted.
Transparent heating surface with multiple arrays of 88 thin film temperature sensors and micro-heaters was developed for the clarification of boiling heat transfer mechanisms, where the relation between local heat transfer coefficients and behaviors of liquid microlayer underneath attached vapor bubbles was investigated. Local surface temperature was controlled to keep constant by the feedback circuits, and a simple and ideal boundary condition on the heat transfer surface was realized. The local heat flux change characterized by the heat transfer enhancement due to the microlayer evaporation and the deterioration by the extending dry patches was detected corresponding to the observed liquid-vapor behaviors underneath a coalesced bubble.
Experiments on pool boiling heat transfer were conducted by using the alcohol-aqueous solutions in order to confirm the increase in the critical heat flux due to the self-wetting effect. The heat transfer characteristics and critical heat flux were dependent on the alcohol concentration. The critical heat flux of alcohol-aqueous was observed higher than that of pure water. In addition, the thermal properties of binary mixtures and the phase equilibrium data were prepared for the data reduction.
Flow boiling in a narrow channel is one of the most promising application forms for the actual high-performance cooling system. A devised structure of cooling system, which had a narrow main channel and an unheated auxiliary channel, was developed and the critical heat flux value was increased by more than twice by the liquid supply from an auxiliary channel.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (6 results)

All 2006 2005

All Journal Article (6 results)

  • [Journal Article] 補助給液構造を持つ狭あい流路コールドプレートにおける限界熱流束2006

    • Author(s)
      新本康久 et al.
    • Journal Title

      日本混相流学会 年間講演会2006 講演論文集(発表予定)

    • NAID

      10019504604

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Critical Heat Flux in Cold Plates of Narrow Channels with Structures for Additional Liquid Supply.2006

    • Author(s)
      Yasuhisa SHINMOTO et al.
    • Journal Title

      The Japanese Society for Multiphase Flow, JSMF Annual Meeting 2006 (to be published)

    • NAID

      10019504604

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Development of Heating Surface for Microgravity Boiling Experiment2005

    • Author(s)
      Yoichi SATO et al.
    • Journal Title

      Sixth Japan/China Workshop on Microgravity Sciences

      Pages: 77-78

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 軌道上実験を想定した沸騰実験装置の考案2005

    • Author(s)
      佐藤洋一 et al.
    • Journal Title

      日本マイクログラビティ応用学会誌 JASMAC-21 講演論文集 22・4

      Pages: 120-120

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Development of Heating Surface for Microgravity Boiling Experiment.2005

    • Author(s)
      Yoichi SATO et al.
    • Journal Title

      Sixth Japan/China Workshop on Microgravity Sciences

      Pages: 77-78

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Design of Boiling Test Facility Developed for Assumed Space Experiments.2005

    • Author(s)
      Yoichi SATO et al.
    • Journal Title

      Journal of the Japan Society of Microgravity Application vol.22,No.4

      Pages: 120-120

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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