Convective heat transfer and flow friction for water flow in microchannel structures
Convective heat transfer and flow friction for water flow in microchannel structures
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DOI：
10.1016/0017-9310(95)00327-4
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发表时间：
1996-08-01
影响因子：
5.2
通讯作者：
Peterson, GP
中科院分区：
文献类型：
--
作者：
Peng, XF;Peterson, GP
对水力直径为0.133-0.367 mm的矩形小通道内水在不同几何形状的微通道结构/平板内的单相强制对流换热和Row特性进行了实验研究。结果表明，几何构型对单相对流换热和流动特性有显著影响。层流传热被发现是依赖于纵横比和水力直径的比的中心到中心的距离的微通道。湍流热传递被发现是一个新的无量纲变量，Z，这样Z = 0.5将是湍流热传递的最佳配置，无论槽的纵横比的进一步的功能。当Z接近0.5时，摩擦系数或流动阻力达到最小值。湍流流动阻力通常小于经典关系式预测的值，并且流动过渡到充分发展的湍流的雷诺数变得比普通槽道流动小得多。提出了计算传热和压降的经验关联式。版权所有（C）1996 Elsevier Science Ltd.
The single-phase forced convective heat transfer and Row characteristics of water in microchannel structures/plates with small rectangular channels having hydraulic diameters of 0.133-0.367 mm and distinct geometric configurations were investigated experimentally. The results indicated that the geometric configuration had a significant effect on the single-phase convective heat transfer and flow characteristics. The laminar heat transfer was found to be dependent upon the aspect ratio and the ratio of the hydraulic diameter to the center-to-center distance of the microchannels. The turbulent heat transfer was found to be a further function of a new dimensionless variable, Z, such that Z = 0.5 will be the optimum configuration for turbulent heat transfer regardless of the groove aspect ratio. The friction factor or flow resistance reached a minimum value as Z approaches 0.5. The turbulent flow resistance was usually smaller than that predicted by classical relationships, and the Reynolds number for flow transition to fully developed turbulent flow became much smaller than the ordinary channel flow. Empirical correlations were suggested For calculating both the heat transfer and pressure drop. Copyright (C) 1996 Elsevier Science Ltd.