Parametric study on the performance of double-layered microchannels heat sink
Parametric study on the performance of double-layered microchannels heat sink
复制标题
双层微通道散热器性能参数化研究
DOI：
10.1016/j.enconman.2014.01.014
复制
发表时间：
2014-04-01
影响因子：
10.4
通讯作者：
Tseng, K. J.
中科院分区：
文献类型：
--
作者：
Wu, J. M.;Zhao, J. Y.;Tseng, K. J.
微通道是电子冷却中常用的几种高热流密度散热技术之一。与单层微通道热沉(SL-MCHS)相比，采用逆流布置的双层微通道热沉不仅可以降低热沉的热阻，而且可以降低基面的最高温升和流向温升。本文数值模拟了不同微通道参数和流动条件下微通道微通道的热阻、泵浦功率和基板表面的温度分布，找出了微通道几何参数和流动条件与微通道整体性能之间的复杂关系。数值结果表明，随着微通道长宽比的增大，DL-MCHS的最佳宽度比应增大。增加微通道的纵横比对改善多层微通道的整体性能的有效性取决于所提供的泵浦功率。具有较大长宽比和较小宽度比的DL-MCHS适用于泵浦功率较大的情况。与上下微通道入口速度相同的情况相比，在给定泵浦功率下，特别是在较低泵浦功率下，调节上通道的入口速度比调节下通道的入口速度更能改善DL-MCHS的整体性能。这些策略可以在DL-MCHS的实际应用中尝试。(C)2014爱思唯尔有限公司。保留所有权利。
Microchannel is one of several high-heat-flux removal techniques being used in electronic cooling. Double-layered microchannel heat sink (DL-MCHS) with counter current flow arrangement is found not only to be able to lower the thermal resistance of the heat sink, but also decrease the maximum temperature and streamwise temperature rise on the base surface compared with single-layered microchannel heat sink (SL-MCHS). The present paper numerically investigated the thermal resistance, pumping power and temperature distribution on the base surface of substrate of DL-MCHS in different microchannel parameters and flow conditions, so as to find the complicated relationship between the overall performance of DL-MCHS and its geometric parameters and flow conditions. The numerical results show that the optimal width ratio of DL-MCHS should be increased when the microchannel aspect ratio is increased. The effectiveness of increasing aspect ratio of microchannels on improving the overall performance of DL-MCHS is dependent on the pumping power provided. DL-MCHS with higher aspect ratio and smaller width ratio is suited to the situation when higher pumping power is provided. Compared with the situation with identical inlet velocity being assigned to the bottom and upper microchannels, adjusting the inlet velocity of upper channels to be smaller than that of bottom channels may result in the improvement of the overall performance of DL-MCHS at a given pumping power, especially when the given pumping power is lower. These strategies could be tried in the real application of DL-MCHS. (C) 2014 Elsevier Ltd. All rights reserved.