Theoretical study of heat transfer enhancement mechanism of high alcohol surfactant in spray cooling
Theoretical study of heat transfer enhancement mechanism of high alcohol surfactant in spray cooling
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高级醇表面活性剂喷雾冷却强化传热机理的理论研究
DOI：
10.1016/j.ijthermalsci.2020.106816
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发表时间：
2021-05
影响因子：
4.5
通讯作者：
Cheng Wen-Long
中科院分区：
文献类型：
--
作者：
Li Yi-Yi;Zhao Rui;Long Wen-Jun;Liu Ruo-Xin;Cheng Wen-Long
高醇表面活性剂能增强喷雾冷却换热，但其增强机理尚未明确。本文采用高醇表面活性剂喷雾冷却的数值模型来阐述喷雾冷却的机理。加入高醇表面活性剂后，喷雾特性和流体性质发生了变化。研究了这些因素对换热的影响，发现高醇表面活性剂对表面张力和液滴直径的影响是强化换热的主要原因：表面张力的减小和液滴直径的增大使液膜变厚、变快，而更大的液膜厚度和速度有利于以更好的流动带走热量。这两个参数都包含在液滴韦伯数中，可见高醇表面活性剂提高喷雾冷却性能的主要原因是韦伯数的增加。在分析喷雾流的影响时，还讨论了主要的传热机理。
High alcohol surfactant could enhance spray cooling heat transfer, however the enhancing mechanism had not been identified. The present work used numerical model of spray cooling for high alcohol surfactant to specify the mechanism. After adding high alcohol surfactant, the spray characteristics and fluid properties were changed. The influences of these factors on heat transfer were studied, and it was found that the enhancement of heat transfer was mainly attributed to the effect of high alcohol surfactant on surface tension and droplet diameter: the decrease of surface tension and increase of droplet diameter made liquid film thicker and faster, and the lager liquid film thickness and velocity were helpful to take away the heat with a better flow. Both parameters were included in Weber number of droplets, and it could be concluded that high alcohol surfactant improved spray cooling performance mainly because of the increased Weber number. The dominant heat transfer mechanism was also discussed in the analysis of the effect of spray flow.
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影响因子：
2.2
作者：
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通讯作者：
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影响因子：
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影响因子：
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DOI：
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发表时间：
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影响因子：
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