Deformation of silicone oil surface impacted by a falling liquid drop : Influence of surface tension and viscosity of a liquid drop

Detailed observations have been conducted on the interfacial deformation of the silicone oil surface and a liquid drop fallen on it. in order to examine the influence of surface tension and viscosity of liquid drop on the interfacial deformation. we used ethanol or glycerin solutions with various concentration as well as water for liquid drops. Special attention has been directed to the maximum depth of the cavity formed on the oil surface, and to the cavity form at its deepest state. We have categorized the configurations of the oil cavity into eleven patterns; in addition to seven patterns observed in the previous study, we have found four new patterns in this experiment. The maximum cavity depth divided by the initial drop diameter can be well correlated by a dimensionless group Re_ We_.