The residence time of a drop on a spoked macrotexture

Abstract eng:
When a water drop impacts a superhydrophobic surface, it can bounce [1]. Recently, it has been shown that the contact time can be reduced by incorporating ridged macrotextures on the surface [2-4]. When non-parallel macrotextures are present, they intersect to create spoked junctions. It is expected that these junctions would affect the impact of the drop; yet existing models disagree on how many droplets might be produced and the time for these droplets to clear the surface. Here we show that the overall residence time depends on the number of spokes if there are less than 2 or more than 5. We develop a physical model that rationalizes our experimental results and also demonstrate that the phenomenon observed for macrotextured, superhydrophobic surfaces extends to macrotextured, wettable surfaces above the Leidenfrost temperature.

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