Abstract:
Based on Wenzel model and Cassie model, the authors studied wetting behavior of liquid metal droplets on a porous wick surface with different zone-properties. It is indicated that, a porous wick surface with large pore diameter and with small Young contact angle has high adhesion ability, but if pore diameter is small and Young contact angle is large,the droplets may move to the surface with large diameter. Furthermore, a new notional strategy which depends on periodical structure of porous wick with different zone-properties is able to avoid splashing the droplets under vibration conditions, and can provide one possibility for potential application in anti-spill technology of the spaceborne products, such as liquid metal heat pipe, ion thruster and atomic clock etc.