Theoretical investigation on the mechanism of surface temperature non-uniformity formation in spray cooling
Theoretical investigation on the mechanism of surface temperature non-uniformity formation in spray cooling
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DOI：
10.1016/j.ijheatmasstransfer.2012.05.054
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发表时间：
2012-09
影响因子：
5.2
通讯作者：
W. Cheng;Fengqin Han;Qi-Nie Liu;R. Zhao
中科院分区：
文献类型：
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作者：
W. Cheng;Fengqin Han;Qi-Nie Liu;R. Zhao
本研究研究了液滴速度不均匀性、SMD（Sauter平均直径）分布不均匀性、液滴数量不均匀性和加热功率对液膜厚度、液膜速度和表面温度分布的影响，然后对非沸腾状态和核沸腾状态下的表面温度不均匀相关性进行了相关性分析。结果表明：随着喷雾参数不均匀性的减小，加热表面液膜厚度变得更加均匀，液膜速度增大，表面温度不均匀性减小。表面温度最高出现在加热面的中心，最低的是出现液膜的位置。液滴数量不均匀性对表面温度不均匀性的影响最大，其次是液滴速度不均匀性。液滴SMD不均匀性的影响是最小的。最后，非沸腾区和核沸腾区的表面温度不均匀相关性的平均绝对误差为 20%。
In this study, the effects of droplet velocity non-uniformity, SMD (Sauter mean diameter) distribution non-uniformity, droplet number non-uniformity, and heating power on the fluid film thickness, fluid film velocity, and surface temperature distribution were investigated, and then the surface temperature non-uniformity correlations in non-boiling regime and nucleate boiling regime were correlated. The results show that: with the decreasing of the spray parameters non-uniformity, the fluid film thickness on the heating surface becomes more uniform, and the fluid film velocity increases, thus the surface temperature non-uniformity decreases. The highest surface temperature appears in the centre of the heating surface, and the lowest is nearby the position where the fluid film appears. The droplet number non-uniformity contributes the largest portion of impact on the surface temperature non-uniformity, followed by the droplet velocity non-uniformity. The effect of droplet SMD non-uniformity is the minimal. Finally, the surface temperature non-uniformity correlations in non-boiling regime and nucleate boiling regime were correlated with a mean absolute error of 20%.