Numerical Study of Coalescence-induced Self-propelled Droplet Jumping on Superhydrophobic Surfaces With Near-wall Effect
Micro-scale droplets on superhydrophobic surfaces can spontaneously jumping after co-alescence during condensation,which has enormous engineering applications.The expanding liquid bridge during coalescence can impact the superhydrophobic surface,and the surface provides a re-action to force the droplet to jump.However,the spontaneous droplet jumping is uncontrollable,to a certain extent.Therefore,in this paper,an improved Volume-of-fluid(VOF)method is utilized to study the coalescence-induced self-propelled jumping dynamics of droplet on superhydrophobic surfaces with near-wall effect.The near-wall structure can change the liquid bridge dynamics and enhance the collision between the liquid bridge and the surface,leading to an increase in jump-ing velocity.The difference of surface wettability between the vertical near-wall structure and the horizontal substrate can further regulate the jumping direction.
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