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Abstract: When micrometric drops coalesce in-plane on a superhydrophobic surface, asurprising out-of-plane jumping motion was observed. Such jumping motiontriggered by drop coalescence was reproduced on a Leidenfrost surface.High-speed imaging revealed that this jumping motion results from the elasticinteraction of the bridged drops with the superhydrophobic-Leidenfrost surface.Experiments on both the superhydrophobic and Leidenfrost surfaces comparefavorably to a simple scaling model relating the kinetic energy of the mergeddrop to the surface energy released upon coalescence. The spontaneous jumpingmotion on water repellent surfaces enables the autonomous removal of watercondensate independently of gravity; this process is highly desirable forsustained dropwise condensation.



Author: Jonathan Boreyko, Chuan-Hua Chen

Source: https://arxiv.org/



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