Development of Novel Cooling System by Combination of Flow Pulsation and Boiling Heat Transfer

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K14916
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Kanazawa Institute of Technology
• Principal Investigator: Fukue Takashi 金沢工業大学, 工学部, 准教授 (80647058)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 脈動流 / 気泡制御 / 沸騰伝熱 / 高密度実装 / 狭隘場の冷却 / 伝熱促進 / 熱交換器 / バイオミメティクス

Outline of Final Research Achievements

This study describes a possibility of a novel forced-water cooling technique that combines the pulsating flow in living organisms and boiling heat transfer through a heat transfer experiment and visualization of evaporated bubbles. A new heat transfer enhancement mechanism that controls the bubbles' motions by generating the flow pulsation was investigated to enhance boiling heat transfer in narrow flow channels for cooling next-generation 3D LSIs. The heat transfer experiment and the flow visualization were conducted separately. A relationship between the cooling performance of the pulsating flow around a cylindrical heating element mounted in the narrow cooling channel and the growth and the detachment of the bubbles around the element were investigated. It is found that the optimum pulsating wave pattern can control the bubbles' growth and detachment, and this achieves effective heat transfer enhancement around the heating element.

Free Research Field

熱流体工学，熱流体設計学

Academic Significance and Societal Importance of the Research Achievements

本研究は，バイオミメティクスの思想にヒントを得て，高発熱密度の冷却に用いる沸騰伝熱に，生体内の脈動流を融合させた新たな冷却メカニズムの実現を目指したものである．脈動流の適切な応用による沸騰伝熱の冷却促進が実現可能な感触が得られ，これは冷却流路が極めて狭隘になることが予想される次世代の超高密度素子の直接冷却に向けた有用な知見である．Society 5.0 のフィジカル空間とサイバー空間の融合化社会の構築が，ウィズコロナの掛け声のもとに加速されているが，情報機器の更なる進化が必須で，ボトルネックとなる電子機器の冷却技術にも新境地が求められる．本研究の成果がひとつの橋頭堡になることを期待している．