Computation on Head-on Collision of two identical droplets with constant surface tension coefficients

摘要

A computational model to simulate head-on collision of two identical droplets with constant surface tension coefficients was constructed. A potential flow was postulated inside each droplet with a thin film viscous air flow between the two droplets. The potential flow was solved by the BEM, whose tangential velocity on the collision surface was embedded into the analytic thin film solution to determine the minimum thickness of the air film. Bouncing takes place when the minimum thickness is larger than the effective distance of the molecular force, while coalescence occurs on the contrary.