Droplet Impingement into a Liquid Film; Numerical Study of Surface Tension Effect on the Crown Formation

IF 1.5 Q3 MECHANICS
Mohammad Mehdi Zamani Asl, Zahra Dastyar
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引用次数: 0

Abstract

An axisymmetric numerical model is conducted to study the droplet impingement into a liquid film and crown formation. Through numerical modeling and experimental validation, the effect of different parameters such as surface tension, Weber number, and film thickness on crown evolution is investigated. Surfactant is added to water, aiming reduction of the surface tension in the surfactant-water mix. It was shown that the crown rim diameter increases with Weber in both water and surfactant-water mixture cases. Likewise, crown rim diameter increases with the film thickness in both different cases of fluids. Additionally, results revealed that surface tension does not affect the crown rim diameter. Nevertheless, crown height increases as surface tension decreases. At low values of surface tension, secondary droplets and the de-wetting region appear. These outcomes can be attributed to the domination of kinetic energy of crown rims in cases with low surface tensions.
液滴撞击液膜;表面张力对冠状物形成影响的数值研究
采用轴对称数值模型研究了液滴撞击液膜和牙冠形成的过程。通过数值模拟和实验验证,研究了表面张力、韦伯数和薄膜厚度等不同参数对牙冠演变的影响。表面活性剂被添加到水中,目的是降低表面活性剂-水混合物中的表面张力。结果表明,在水和表面活性剂-水混合物的情况下,冠缘直径都随Weber的增加而增加。同样,在两种不同的流体情况下,冠缘直径都随着薄膜厚度的增加而增加。此外,结果表明,表面张力不会影响冠缘直径。然而,胎冠高度随着表面张力的降低而增加。在表面张力值较低时,会出现二次液滴和去润湿区域。这些结果可归因于在低表面张力的情况下冠缘的动能占主导地位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.70
自引率
8.30%
发文量
0
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