Experimental study of evaporation resistance on porous surfaces in flat heat pipes

ITherm 2002. Eighth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.02CH37258) Pub Date : 2002-08-07 DOI:10.1109/ITHERM.2002.1012463

L. Chien, C. Chang

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引用次数: 19

Abstract

This experimental study investigated the effect of particle size and coating thickness of the porous surface on evaporator thermal resistance of a thermosyphon having a 16 mm diameter circular heating area. Copper particles having two kinds of size distributions were sintered on a copper plate. The two particle distributions were 115 /spl mu/m average diameter in the range 50 to 500 /spl mu/m, and 247 /spl mu/m average diameter in the range 180 to 350 /spl mu/m. The particle coating thickness was either 0.5 or 1.0 mm for each distribution. Water was used as the working fluid, and it was tested at 60 or 70/spl deg/C saturation temperature, which corresponds to sub-atmospheric saturation pressure. The heat flux varied between 30 and 550 kW/m/sup 2/. The boiling surfaces were tested in vertical and horizontal orientations, and the experimental results showed negligible effect on the surface orientation. The best boiling surface in the present study is obtained with a coating 1.0 mm thick and 247 /spl mu/m average particle diameter. At 70/spl deg/C this surface yielded less than 0.025 K/W evaporation thermal resistance at 93 W.

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平板热管多孔表面蒸发阻力的实验研究

本实验研究了直径为16mm的圆形受热区热虹吸管的颗粒大小和多孔表面涂层厚度对蒸发器热阻的影响。在铜板上烧结了两种尺寸分布的铜颗粒。在50 ~ 500 /spl亩/m范围内，平均粒径为115 /spl亩/m;在180 ~ 350 /spl亩/m范围内，平均粒径为247 /spl亩/m。每种分布的颗粒涂层厚度为0.5或1.0 mm。以水为工质，在60或70/spl℃饱和温度下进行测试，对应于亚大气压饱和压力。热流密度在30 ~ 550 kW/m/sup /之间变化。在垂直和水平方向上对沸腾表面进行了测试，实验结果表明，表面方向对沸腾表面的影响可以忽略不计。当涂层厚度为1.0 mm，平均颗粒直径为247 /spl mu/m时，获得了最佳沸腾表面。在70/spl度/C时，该表面在93 W时产生小于0.025 K/W的蒸发热阻。

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ITherm 2002. Eighth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.02CH37258)

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