Development of Boiling Type Cooling System Using Electrohydrodynamics Effect
Development of Boiling Type Cooling System Using Electrohydrodynamics Effect
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DOI：
10.1115/1.4024390
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发表时间：
2013-09
影响因子：
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通讯作者：
I. Kano;Yuta Higuchi;Tadashi Chika
中科院分区：
文献类型：
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作者：
I. Kano;Yuta Higuchi;Tadashi Chika
本文介绍了电场对常压池沸腾过程中核沸腾和临界热流密度影响的实验研究结果。以HFE-7100 （3m Co.）的介电液为工质。对受热面进行抛光，表面粗糙度Ra为0.05 μm。为了在高压作用下产生不均匀的强电场并产生电流体动力效应，设计了一种微尺寸的电极，在电极上设置了狭缝。得到的结果证实了CHF的增强，因为EHD效应使CHF在−1500 V电压下增加到47 W/cm2，这是自由对流沸腾时CHF的3倍。从电极上气泡的行为和沸腾表面条件的观察来看，液体和蒸汽之间的不稳定性增加了热流密度，传热系数（HTC）和CHF。通过加入EHD效应，修正了由Kelvin-Helmholtz不稳定性引起的气泡界面上的行波。利用沸点表面与电极间隙处液-气表面的频率比，可以充分预测有电场和无电场条件下的临界热流密度增加比。
This paper describes results from an experimental study of the effect of an electric field on nucleate boiling and the critical heat flux (CHF) in pool boiling at atmospheric pressure. A dielectric liquid of HFE-7100 (3 M Co.) was used as working fluid. A heating surface was polished with the surface roughness (Ra) of 0.05 μm. A microsized electrode, in which the slits were provided, was designed in order to generate non uniform high electric fields and to produce electrohydrodynamic (EHD) effects with the application of high voltages. The obtained results confirmed the enhancement of CHF since the EHD effects increased the CHF to 47 W/cm2 at the voltage of −1500 V, which was three times as much as CHF for the free convection boiling. From the observations of the behavior of bubbles over the electrode and of the boiling surface condition, the instability between the liquid and the vapor increased the heat flux, the heat transfer coefficient (HTC), and the CHF. The usual traveling wave on the bubble interface induced by the Kelvin-Helmholtz instability was modified by adding the EHD effects. The ratio of critical heat flux increase with and without the electric field was sufficiently predicted by the frequency ratio of liquid–vapor surface at the gap between the boiling surface and the electrode.