Effect of Impact Velocity on Spreading and Evaporation of a Volatile Droplet on a Non-porous Substrate

The time evolution of spreading and evaporation following droplet impact on a non-porous substrate is experimentally investigated. Ethanol is considered the working liquid in all cases. The droplet impact occurs on a glass substrate. The main objective is to understand the influence of impact velocity on the dynamics of the spreading and evaporation rate of the droplet. The impact velocity range is selected to avoid splashing after the impact. The experimental results show no considerable variation in the maximum spread diameter and total evaporation time for the different impact velocities. However, the above parameters are always higher for the sessile droplet, where the droplet is gently placed on the substrate.