Effect of viscosity ratio on the drop impact dynamics

Drop impact on a liquid pool is ubiquitous in many natural and industrial processes. Theliquid viscosity plays an important role in changing both the global and local drop impactdynamics. The impacts with same type of liquids for the drop and the liquid pool have beenstudied extensively. Here, drop impact on a liquid pool with mismatched viscosity isnumerically simulated and various behaviors emerge during the drop impact process. Theenergy distribution during the impact process obtained from the simulation provides insighton the dynamics. In addition, the interstitial layer between the drop and liquid pool is criticalfor the bouncing to merging transition as well as the bouncing dynamics. The effect ofviscosity ratio on the interstitial layer dynamics is also studied. The scrutiny of the detaileddynamics gained from the simulation provides better understanding of the drop impactprocess and lays the foundation for further studies.