Natural convection in evaporating sessile drops with crystal growth

Abstract

Laser shadowgraphy is employed to study interfacial instability and natural convection inside a minute drop evaporating on a plate with internal crystal growth. Both pure and binary liquids are considered. Two methods of crystal growth are developed, one by the bulk-supercooling method and the other by the point-supercooling method. Interfacial instability is determined by the characteristics of periphery shape of the shadowgraph, while the shadowgraphic image describes the nature of flow behavior inside the drop. While internal crystallization plays no role in interfacial instability, it exerts a profound found influence on natural convection.