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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study on the heat transfer coefficient of water flow boiling in mini/microchannels
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Experimental study on the heat transfer coefficient of water flow boiling in mini/microchannels

机译：微型/微通道中水流沸腾传热系数的实验研究

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摘要

The heat transfer coefficients of the evaporative water flow in mini/microchannels are studied experimentally to explore the novel heat dissipation for high power electronics. Two sets of parallel channels which are 61 channels with hydraulic diameter of 0.293mm and 20 channels with hydraulic diameter of 1.2mm are investigated respectively. The inlet and outlet temperatures of fluids, and the temperatures beneath the channels are measured to calculate the heat dissipation of the evaporative water in channels. The experiments are carried out with the mass flow rates range from 11.09kg/(m~2s) to 44.36kg/(m~2s) for minichannels and 49.59kg/(m~2s) to 198.37kg/(m~2s) for microchannels. The effective heat flux range from 5W/cm~2 to 50W/cm~2, and the resulted outlet vapor qualities range from 0 to 0.8. The relations of the heat transfer coefficient with heat flux and vapor quality are analyzed according to the results. The experimental heat transfer coefficients are compared with the prediction of latest developed correlations. A new correlation takes the effect of Bond number is proposed, and be verified that it is effective to predict the heat transfer coefficient of both minichannels and microchannels in a large range of vapor qualities.
机译：通过实验研究了微型/微通道中蒸发水流的传热系数，以探索大功率电子设备的新型散热。分别研究了两组平行通道，即61个水力直径为0.293mm的通道和20个水力直径为1.2mm的通道。测量流体的入口和出口温度以及通道下方的温度，以计算通道中蒸发水的散热量。实验的质量流量范围为：小通道从11.09kg /（m〜2s）至44.36kg /（m〜2s），小通道从49.59kg /（m〜2s）至198.37kg /（m〜2s）微通道。有效热通量为5W / cm〜2到50W / cm〜2，产生的出口蒸气质量为0到0.8。根据结果​​分析了传热系数与热通量和蒸汽质量的关系。将实验传热系数与最新开发的相关性的预测进行比较。提出了一种新的相关性，考虑了键数的影响，并验证了在大范围的蒸气质量范围内预测小通道和微通道的传热系数是有效的。

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