Theoretical and Experimental Investigation of the Minimum Wetting Rate of a Falling Water Film on the Vertical Grooved Plate
Theoretical and Experimental Investigation of the Minimum Wetting Rate of a Falling Water Film on the Vertical Grooved Plate
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DOI：
10.1021/acs.iecr.1c02533
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发表时间：
2021-12
影响因子：
4.2
通讯作者：
J. Wei;Jinping Liu;Xiongwen Xu
中科院分区：
文献类型：
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作者：
J. Wei;Jinping Liu;Xiongwen Xu
当液体流速增加时，降膜首先完全润湿受热面的最小润湿速率是保证降膜装置安全高效运行的重要数值，在垂直光滑板上进行了大量的研究。本文从理论和实验两方面研究了水膜在垂直槽板上的最小润湿速率。提出了考虑沟槽结构和平衡水接触角影响的最小润湿速率的热力学预测方法。在实验装置上对6块不同槽型结构的槽型铝板进行了测试，发现最小润湿率的实验结果比理论结果低15%。基于这些结果，开发了槽板上最小水润湿率的相关性，以清楚地说明所涉及的关系。
The minimum wetting rate, at which the falling film first wets the heating surface completely when increasing the liquid flow rate, is an important value for the safe and efficient performance of the falling film device and has been studied extensively on a vertical smooth plate. In this paper, the minimum wetting rate of a water film flowing on the vertical grooved plate was studied both theoretically and experimentally. A thermodynamic method was proposed to predict the minimum wetting rate concerning the effect of the groove structure and the equilibrium water contact angle. Six grooved aluminum plates with different groove structures were tested in the experimental setup, which found that the experimental results for the minimum wetting rate are 15% lower than the theoretical results. Based on these results, a correlation of the minimum water wetting rate on the grooved plate was developed for a clear illustration of the relations involved.