期刊
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
卷 34, 期 1, 页码 219-228出版社
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-019-1223-z
关键词
Droplet impact; Roughness; Slippery oil-infused; Wettability
资金
- National Natural Science Foundation of China (NSFC) [51876203, 51850410519]
- Chinese Academy of Science, President's International Fellowship Initiative (PIFI) [2017PE0002]
In this study, we investigated droplet impact dynamics offalling water drops (D-0 2.3 mm ) on slippery oil-infused surfaces and compared them to other features of the surfaces, to elucidate the wettability- and roughness-controlled characteristics. We prepared transparent substrates with the designed characteristics, so it would be feasible to visualize the droplet impact dynamics in detail. A wide range of impact kinetics (We 800 (=rho D0Vi2/sigma(w))) was covered, which gave rise to several types of droplet-impact: gentle spreading, wavy (undulated fingers of spreading edges), droplet break-up, and splashing with small secondary droplets. The basic parameters of the droplet-solid interactions were measured, and events were mapped with respect to the sample surface and impact kinetic conditions. We found that, generally, surface wettability has a major influence on the triple line shape and instability during the impact and retraction process, and thus determines events in of the framework of the dynamic wetting-failure model. Furthermore, while rough conditions promote instability of the impacted droplet, slippery lubricant-infused features tend to dampen perturbations of the spreading/retracting edge.
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