Spontaneous jumps of a droplet

Abstract
Water droplets condensing with a nonzero contact angle on a solid substrate maintained near its melting point exhibit a very unusual behavior. Droplet growth is accompanied by rotation, translation, and hopping movements. Microscopic observations show that the substrate melts along the line of three-phase contact. An analysis of the flow rate and temperature dependence of the phenomenon indicates that droplets are set into motion by the relaxation of the substrate strain during melting.

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