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论文类型：期刊论文

发表时间：2017-08-07

发表刊物：APPLIED PHYSICS LETTERS

收录刊物：SCIE、EI、Scopus

卷号：111

期号：6

ISSN号：0003-6951

摘要：The mechanism of coalescence-induced droplet jumping on superhydrophobic surfaces has been relatively well-established over the years. Most of the related studies are only considering the coalescence process of equal-sized water droplets. However, the coalescence of droplets with different sizes is actually more frequently encountered and the effect of the size ratio on droplet jumping is very crucial to the hydrodynamics of this process. In this work, the effect of the initial droplet size ratio on coalescence-induced jumping of two water droplets is investigated experimentally and numerically. For the previously reported jumping droplet sizes (similar to 1-100 mu m), it is found that the critical droplet size ratio below which the jumping does not occur is about 0.56. The results agree well with the experimental data as the size ratios of observed jumping events collapse into the predicted jumping regime. These findings will gain insights into droplet jumping which has great potential in a number of industrial processes. Published by AIP Publishing.