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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 >Investigation of saturated critical heat flux in a single, uniformly heated microchannel
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Investigation of saturated critical heat flux in a single, uniformly heated microchannel

机译：研究单个均匀加热的微通道中的饱和临界热通量

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A series of tests have been performed to determine the saturated critical heat flux (CHF) in 0.5 and 0.8 mm internal diameter microchannel tubes as a function of refrigerant mass velocity, heated length, saturation temperature and inlet liquid subcooling. The tested refrigerants were R-134a and R-245fa and the heated length of microchannel was varied between 20 and 70 mm. The results show a strong dependence of CHF on mass velocity, heated length and microchannel diameter but no influence of liquid subcooling (215 degrees C) was observed. The experimental results have been compared to the well-known CHF single-channel correlation of Y. Katto and H. Ohno [An improved version of the generalized correlation of critical heat flux for the forced convective boiling in uniformly heated vertical tubes, Int. J. Heat and Mass Transfer 27 (9) (1984) 1641-1648] and the multichannel correlation of W. Qu and I. Mudawar (Measurement and correlation of critical heat flux in two-phase microchannel heat sinks, Int. J. Heat and Mass Transfer 47 (2004) 2045-2059]. The comparison shows that the correlation of Katto-Ohno predicts microchannel data with a mean absolute error of 32.8% with only 41.2% of the data falling within a +/-15% error band. The correlation of Qu and Mudawar shows the same trends as the CHF data but significantly overpredicts them. Based on the present experimental data, a new microscale version of the Katto-Ohno correlation for the prediction of CHF during saturated boiling in microchannels has been proposed. (C) 2006 Elsevier Inc. All rights reserved.
机译：已经进行了一系列测试以确定内径为0.5和0.8 mm的微通道管中的饱和临界热通量（CHF），该饱和临界热通量是制冷剂质量速度，加热长度，饱和温度和入口液体过冷的函数。测试的制冷剂为R-134a和R-245fa，微通道的加热长度在20到70 mm之间变化。结果表明，CHF对质量速度，加热长度和微通道直径有很强的依赖性，但未观察到液体过冷（215摄氏度）的影响。实验结果已与Y.Katto和H.Ohno的著名的CHF单通道相关性进行了比较[用于均匀加热垂直管中强制对流沸腾的临界热通量的广义相关性的改进版本Int。 J. Heat and Mass Transfer 27（9）（1984）1641-1648]和W. Qu和I. Mudawar的多通道相关性（两相微通道散热器中临界热通量的测量和相关性，Int。J. Heat and Mass Transfer 47（2004）2045-2059]。比较结果表明，Katto-Ohno的相关性预测微通道数据的平均绝对误差为32.8％，只有41.2％的数据落在+/- 15％的误差带内。Qu和Mudawar的相关性与CHF数据显示出相同的趋势，但是它们的预测值过高。基于目前的实验数据，提出了一种新的微尺度版Katto-Ohno相关性，用于预测微通道中饱和沸腾过程中的CHF （C）2006 Elsevier Inc.保留所有权利。

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