Experimental investigation of a porous heat sink characterized by straight circular ducts

ITHERM 2000. The Seventh Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.00CH37069) Pub Date : 2000-05-23 DOI:10.1109/ITHERM.2000.866195

H.Y. Zhang, X.Y. Huang

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Abstract

An experimental and theoretical investigation of convection heat transfer for a porous heat sink is performed. The porous heat sink is characterized by straight circular ducts uniformly arranged in an aluminum block. The diameter of each duct is 1.5 mm. The cooling fluid is water, with the flow rate ranging from 1.13 ml/s to 1.32/spl times/10/sup 2/ ml/s and the pore-scale Reynolds number Re from 8.50 to 9.82/spl times/10/sup 2/. The measured heat transfer coefficient based on the temperature difference between the wall to the inlet fluid is found ranging 0.21-1.64 W/cm/sup 2/, which is much higher than the results from packed-bead systems and comparable to the results from sintered copper-bead porous systems. In the theoretical analysis, the local thermal non-equilibrium is considered. The Nusselt numbers from the experiment and the theoretical prediction are compared and satisfactory agreement is found. Finally, a fitted correlation in terms of InRe for the measured Nusselt number is obtained.

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直圆管多孔散热器的实验研究

对多孔散热器的对流换热进行了实验和理论研究。多孔散热器的特征是均匀地设置在铝块中的直圆形管道。每个风管直径为1.5 mm。冷却流体为水，流量范围为1.13 ml/s ~ 1.32/spl倍/10/sup 2/ ml/s，孔尺度雷诺数Re范围为8.50 ~ 9.82/spl倍/10/sup 2/。基于壁面与入口流体之间温差的换热系数测量值为0.21 ~ 1.64 W/cm/sup 2/，远远高于填料球系统的结果，与烧结铜球多孔系统的结果相当。在理论分析中，考虑了局部热不平衡。将实验所得的努塞尔数与理论预测的努塞尔数进行了比较，得到了满意的结果。最后，得到了用InRe表示的测量努塞尔数的拟合相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ITHERM 2000. The Seventh Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.00CH37069)

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