Abstract:
Dynamic characteristics of large droplet impacting on surface at high velocities were simulated using Volume Of Fluid method(VOF). Droplet splashing was found at the spreading phase of the droplet impacting the surface at a high velocity. At the contraction phase, the phenomenon of the slow contraction, the water ring separating with the central water film, the water central film breaking into two parts and full breaking up will appear with the diameter of the droplet decreasing and the velocity of the droplet increasing. The maximum spreading diameter and the maximum spreading coefficient increase with the increasing of the droplet diameter and the droplet velocity. The dimensionless time of reaching the maximum spreading diameter increases slightly with the diameter increasing. The variation of the dimensionless time of reaching the maximum spreading diameter is small at different velocities for the same diameter droplet.