Pool Boiling Enhanced by Electric Field Distribution in Microsized Space
Pool Boiling Enhanced by Electric Field Distribution in Microsized Space
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微空间电场分布增强池沸腾
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
th Micro
中科院分区：
文献类型：
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作者：
I. Kano;th Micro
本文对静电压力对沸腾换热的增强作用进行了实验和分析研究。选择一种含氟介质液体作为工作流体。在常压下测量了饱和液体的沸腾换热。为了明确强化机理，设计了3个具有不同狭缝宽度、电极宽度和沸点表面总狭缝长度的微尺寸狭缝电极。在电极上形成几百微米的狭缝，通过静电压力除去沸点表面的蒸汽泡。沸点表面接地，电极置于沸点表面上方200 μm ~ 400 μm高度。在-7 kV/mm的电场作用下，最大热流密度为76 W/ cm2，是无电极池沸腾的3.5倍。先前的池沸腾解析方程体现了电场对沸腾传热影响的本质特征，与实验结果吻合较好。
In this study, the enhancement of boiling heat transfer by electrostatic pressure was experimentally and analytically investigated. A fluorinated dielectric liquid was selected as the working fluid. Pool boiling heat transfer in the saturated liquid was measured at atmospheric pressure. In order to make clear the enhancement mechanisms, three microsized slit electrodes were designed with different slit widths, electrode widths, and total slit lengths over the boiling surface. Slits of several hundred micrometers were formed in the electrode, so as to remove vapor bubbles from the boiling surface by electrostatic pressure. The boiling surface was electrically grounded, and the electrode was placed above the boiling surface at heights of 200 μm to 400 μm. The maximum heat flux was 76 W/cm 2 by the application of an electric field of -7 kV/mm, which was 3.5 times over pool boiling without the electrode. The previous analytical equation of pool boiling exhibited the essential feature of the effect of the electric field on the boiling heat transfer, and showed good agreement with the experimental results.