Scale effects on fluid flow and heat transfer in microchannels
Scale effects on fluid flow and heat transfer in microchannels
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DOI：
10.1109/6144.868859
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发表时间：
2000-09
影响因子：
--
通讯作者：
M. Sabry
中科院分区：
文献类型：
--
作者：
M. Sabry
许多研究人员最近通过实验证实，用于冷却电子芯片的微通道中的流体流动和传热特性与正常尺寸的通道不同。偏差随着通道尺寸的减小而增加。提出了许多假设来解释一些观察到的偏差。然而，它们通常与其他观察到的偏差相矛盾。因此，到目前为止，还没有对这些现象给出确凿的解释。在这项工作中，观察到的偏差将被列出，不同的假设提出解释这些偏差将被严格修订。最后，基于表面粗糙度对微通道内流动和传热的影响，提出了一个新的假设。将建立简单的模型，能够再现观察到的层流区域摩擦和传热系数的趋势，并对层流湍流过渡给出改进的预测。
Many investigators have recently experimentally established that fluid flow and heat transfer characteristics in microchannels, used to cool electronic chips, deviate from those of normally sized channels. Deviations increase as the channel size decreases. Many hypotheses were advanced to explain some of the observed deviations. However, they were usually in contradiction with other observed deviations. Hence, no conclusive explanation has been given so far for these phenomena. In this work, observed deviations will be listed, different hypotheses advanced to interpret these deviations will he critically revised. Finally, a new hypothesis will be advanced based on the increased role of surface roughness on flow and heat transfer in microchannels. Simple models will be built capable of reproducing observed trends for both friction and heat transfer coefficient in the laminar region, as well as giving an improved prediction for the laminar turbulent transition.