Droplet impacting dynamics on wettable, rough and slippery oil-infuse surfaces
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In this study, we investigated droplet impact dynamics offalling water drops (D0 ~ 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 (=ρD0Vi2/σw)) 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.
KeywordsDroplet impact Roughness Slippery oil-infused Wettability
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The authors gratefully acknowledge the financial support provided by National Natural Science Foundation of China (NSFC Grant No. 51876203 and No. 51850410519), and supported by the Chinese Academy of Science, President’s International Fellowship Initiative (PIFI Grant No. 2017PE0002).
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