Development of high-density heat rejection device which realizes ultimately minimum mass flow rate of coolant

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03909
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Muroran Institute of Technology
• Principal Investigator: Imai Ryoji 室蘭工業大学, 大学院工学研究科, 教授 (60730223)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: マイクロチャネル / 三相界面 / 蒸発 / 高熱流束 / 毛細管力 / 電気毛管力 / 徐熱デバイス

Outline of Final Research Achievements

A test specimen was created using a microchannel and transparent electrodes that allows the flow behavior within the channel to be visualized. An electric field was applied parallel and perpendicular to the microchannel, and the driving status of the refrigerant in each electric field direction was observed. It was confirmed that the refrigerant (pure water) within the microchannel could be driven by applying a DC electric field parallel to the microchannel. An equation of motion was formulated that takes into account the inertial forces, viscous forces, capillary forces, gravity, pressure forces, and electrostatic forces acting on the liquid within the microchannel, making it possible to reproduce the driving status of the liquid within the microchannel by an electric field. Using the above flow analysis model, the effects of the electric field magnitude and electric field gradient on the liquid driving characteristics were clarified.

Free Research Field

航空宇宙工学

Academic Significance and Societal Importance of the Research Achievements

きわめて高い徐熱流束の実現が可能な気固液三相界面近傍の熱流束を利用した排熱デバイスの実現の第一ステップとして，電気毛管力によるマイクロチャネル内液体の駆動を実験および数値解析により実証した．電気流体力学を利用した排熱デバイスの実現に一歩近づいた．本成果は電動化自動車および航空機に搭載されるパワーデバイスの冷却システムの小型化に貢献し，ひいては自動車や航空機のCO2排出抑制に寄与するものである．