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首页> 外文期刊>International Journal of Heat and Mass Transfer >Convective heat transfer in diverging and converging microchannels
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Convective heat transfer in diverging and converging microchannels

机译：对流传热在扩散和收敛的微通道中

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In this work, experimental and three-dimensional numerical study is performed on single phase liquid flow in two scenarios: heated diverging and heated converging microchannel. MicroChannel with 8° angle of divergence and 156 μm of hydraulic diameter is employed for experiments in both diverging and converging modes. The objectives are to obtain the Nusselt number and to understand the conjugate effect in varying cross-section microchannels with the viewpoint of using such geometries in the design of heat sinks for electronics cooling. The experiments are performed for mass flux and heat flux range of 113-1200 kg/m~2-s (Re = 30-274) and 0.3-9.5 W/cm~2, respectively, with de-ionized water as the working fluid. The surface and bulk mean temperatures are measured, and used to calculate the heat transfer coefficient. Numerical results show that the conjugate effect results in different nature of heat flux distribution in diverging vs. converging microchannel. This leads to a nearly constant heat flux condition and 35% higher heat transfer in converging microchannel compared with diverging microchannel. It is further observed that less pumping work is required in diverging and converging microchannels as compared with uniform cross-section microchannel. The thermo-hydraulic performance.of diverging and converging microchannels is of significance in the development of compact heat sinks.
机译：在这项工作中，在两种情况下对单相液体流动进行了实验和三维数值研究：加热的发散和加热的会聚微通道。具有8°发散角和156μm水力直径的微通道用于发散和会聚模式的实验。目的是获得努塞尔数并了解在不同横截面微通道中的共轭效应，以在电子冷却装置的散热器设计中使用这种几何形状为目的。以去离子水为工作液，分别在113-1200 kg / m〜2-s（Re = 30-274）和0.3-9.5 W / cm〜2的质量通量和热通量范围内进行实验。 。测量表面和总体平均温度，并将其用于计算传热系数。数值结果表明，共轭效应导致发散和会聚微通道的热通量分布具有不同的性质。与发散的微通道相比，这导致收敛的微通道中的热通量条件几乎恒定，并且热传递提高了35％。进一步观察到，与均匀横截面的微通道相比，在发散和会聚的微通道中需要较少的泵送功。发散和收敛的微通道的热工液压性能在紧凑型散热器的开发中具有重要意义。

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