Bouncing drop on liquid film: Dynamics of interfacial gas layer

The transition between merging and bouncing outcomes for a drop impacting on a liquid film is critically controlled by the resistance from the microscopic interfacial gas layer trapped between the interacting and deformable drop and film surfaces. Using high-speed imaging and color interferometry, we have quantified and analyzed the gas layer dynamics during bouncing when the liquid film thickness is comparable to the drop radius. Results show...