Experimental study on the dynamics of droplet collisions at different viscosities

Abstract

In this study, glycerol solution was used to study the collision process of moving droplets and sessile droplets at different viscosities. Two typical collision states, compression and rebound, are photographed by a high-speed camera. The experimental results show that complete rebound occurs under low Weber number (We), and the rebound We range increases with the droplet viscosity. A liquid cap is generated under high We. As We increases, the dimensionless maximum rebound height increases and the contact time decreases, following an inverse proportional function. The research results help in understanding the impact behavior of different viscosities and We on static droplets, providing an important reference for droplet control and application.