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Development on efficient miniature flat heat pipes for high power electronic cooling

Research Project

Project/Area Number 18F18057
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Research Field Thermal engineering
Research InstitutionThe University of Tokyo

Principal Investigator

党 超鋲  東京大学, 大学院新領域創成科学研究科, 准教授 (30401227)

Co-Investigator(Kenkyū-buntansha) HONG SIHUI  東京大学, 新領域創成科学研究科, 外国人特別研究員
Project Period (FY) 2018-07-25 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2020: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2019: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2018: ¥600,000 (Direct Cost: ¥600,000)
Keywords高熱流束冷却 / データセンター冷却 / マイクロチャネル / 流動沸騰 / 流動不安定 / 薄液膜蒸発 / 濡れ性 / ヒートパイプ / Flow boiling / Expanding minichannel / Liquid replenishment / Flow instability / Microchannel heat sink / Cut-off structure
Outline of Annual Research Achievements

高熱流束冷却には、マイクロチャネルを用いた流動沸騰が有効であるが、並列沸騰流路を用いる時、各流路の流量が不均一・不安定になりやすく制御することが困難であることが知られている。この問題を対処するため、放射拡張流路利用して流動安定化させる手法を提案し、高い流動安定性及び伝熱促進効果を確認した。
放射拡張流路は、中心部に液体が流入させ、半径方向に沿って流れる構造になっている。入口噴流(流量の均等分配及び逆流防止効果)と拡張流路(逆流防止効果)の相乗効果により、低い流量条件でも安定した液膜蒸発が維持され、高い伝熱性能が確認できた。入口二相状態の場合、入口での乾き度が高いほど高い熱伝達率が得られるため、複数の熱源(CPU,サーバー、ラックなど)が直列或いは並列に繋いで同時に冷却することが可能になった。また、重力の影響による流量分配の偏り及び伝熱性能の低下が無視できることを実験的に確認した。集光倍率1070倍の太陽電池冷却に適用する時、熱流束が82.4W/cm2条件での最大熱伝達率は235kW/m2Kであった。さらに、高熱流束、大面積の熱源を冷却するため,発泡金属を用いて冷却器の下流側に液体を供給する構造を提案し,下流側でのドライアウトを抑制することで,2倍以上の伝熱促進が実現した。
マイクロ流路内の二相流動の研究として、水力直径が1㎜の円管と矩形管内のスラグ流の形成条件およびスラグと壁面の間の薄液膜の特性をレーザ共焦点変位計で計測した。円管において、キャピラリー数が0.001以下の場合スラグと壁面の間に液膜が存在しない、気泡の移動抵抗が大きいことを明らかにした。矩形管において、キャピラリー数が0.01までは液膜の厚みが10μm程度一定になり、その後流速の増大に従って増加することを明らかにした。

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (14 results)

All 2020 2019 2018

All Journal Article (8 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 8 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Development of two-phase flow microchannel heat sink applied to solar-tracking high-concentration photovoltaic thermal hybrid system2020

    • Author(s)
      Sihui Hong, Bohan Zhang, Chaobin Dang, Eiji Hihara
    • Journal Title

      Energy

      Volume: 212 Pages: 118739-118739

    • DOI

      10.1016/j.energy.2020.118739

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Improved two-phase flow boiling in a minichannel heat sink for thermal management of information and communication technology (ICT) equipment2020

    • Author(s)
      Sihui Hong, Chaobin Dang, Eiji Hihara, Hitoshi Sakamoto, Mizuki Wada
    • Journal Title

      Applied Thermal Engineering

      Volume: 181 Pages: 119957-119957

    • DOI

      10.1016/j.applthermaleng.2020.115957

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A 3D inlet distributor employing copper foam for liquid replenishment and heat transfer enhancement in microchannel heat sinks2020

    • Author(s)
      Sihui Hong, Chaobin Dang, Eiji Hihara
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 157 Pages: 119934-119934

    • DOI

      10.1016/j.ijheatmasstransfer.2020.119934

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental investigation on flow boiling characteristics of radial expanding minichannel heat sinks applied for two-phase flow inlet2020

    • Author(s)
      Sihui Hong, Chaobin Dang, Eiji Hihara
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 151 Pages: 119316-119316

    • DOI

      10.1016/j.ijheatmasstransfer.2020.119316

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental investigation on flow boiling in radial expanding minichannel heat sinks applied for low flow inertia condition2019

    • Author(s)
      Sihui Hong, Chaobin Dang, Eiji Hihara
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 143 Pages: 118588-118588

    • DOI

      10.1016/j.ijheatmasstransfer.2019.118588

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of counter current airflow on film dispersion and heat transfer of evaporative falling film over a horizontal elliptical tube2019

    • Author(s)
      Yee-Ting Lee, Sihui Hong, Chaobin Dang, Liang-Han Chien, An-Shik Yang
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 141 Pages: 964-973

    • DOI

      10.1016/j.ijheatmasstransfer.2019.07.029

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Visualization investigation of the effects of nanocavity structure on pool boiling enhancement2019

    • Author(s)
      Sihui Hong, Siqiang Jiang, Yanxin Hu, Chaobin Dang, Shuangfeng Wang
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 136 Pages: 235-245

    • DOI

      10.1016/j.ijheatmasstransfer.2019.03.001

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental research of the critical geometric parameters on subcooled flow boiling in confined microchannels2018

    • Author(s)
      Sihui HONG, Yongle TANG, Chaobin DANG, Shuangfeng WANG
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 116 Pages: 73-83

    • DOI

      10.1016/j.ijheatmasstransfer.2017.09.017

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 可変流路 自励振動型ヒートパイプの 起動特性に関する研究2020

    • Author(s)
      髙山 晶帆, 党 超鋲, 洪 思慧, 飛原 英治
    • Organizer
      2020年度日本機械学会熱工学コンファレンス
    • Related Report
      2020 Annual Research Report
  • [Presentation] 拡張流路を用いた高熱流束電子機器冷却性能向上に関する研究2020

    • Author(s)
      党 超鋲, 洪 思慧
    • Organizer
      2020年度日本機械学会熱工学コンファレンス
    • Related Report
      2020 Annual Research Report
  • [Presentation] Experimental investigation on the flow boiling heat transfer of radial expanding channel heat exchangers2019

    • Author(s)
      Chaobin Dang, Mengjie Song, Sihui Hong, Xufa Cao, Eiji Hihara
    • Organizer
      0th International Conference on Multiphase Flow
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of high concentration photovoltaic system combined with efficient waste-heat driving air-conditioning system2019

    • Author(s)
      Chaobin Dang, Eiji Hihara
    • Organizer
      International Workshop on Environmental Engineering 2019 (IWEE2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Investigation of novel radial diverging two-phase minichannel heat exchangers for hybrid PV-CSP thermal management application2019

    • Author(s)
      Sihui Hong, Chaobin Dang, Eiji Hihara
    • Organizer
      International Workshop on Environmental Engineering 2019 (IWEE2019)
    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Experimental Investigation on Flow Boiling Characteristics of Radial Expanding MiniChannels Heat Sink for Hybrid PV-CSP Thermal Management System2019

    • Author(s)
      Sihui Hong, Chaobin Dang, Eiji Hihara
    • Organizer
      第56回日本伝熱シンポジウム
    • Related Report
      2018 Annual Research Report

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Published: 2018-07-26   Modified: 2024-03-26  

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