Marangoni-driven dynamics of a volatile droplet on the liquid layer

Inhalt:
The dynamics of a volatile droplet on the liquid layer are widely used in nature and industry, but the mechanisms of spreading and evaporation in such a system are still lacking. We investigate the Marangoni-driven dynamic of a dripping mixture IPA droplet on the oil layer. The volatile drop spreads and spontaneously fragments into a myriad of submillimetric droplets from the periphery of the mother drop. By considering the balance of viscous stress and tangential stresses, characteristic radius and time is a power law with oil layer height and initial droplet volume. We further perform experiments to demonstrate their relations. Our results provide important missing pieces to the rich mechanisms of the Marangoni effect.