Influence of characteristics and roughness of nucleation in conical pits on surface heterogeneous nucleation

摘要

Aiming at the problem of nucleation of water on solid surface, with ideal conical tip and conical pit as a geometric model of common solid surface roughness, based on the classical nucleation theory, the research includes nucleation power on the rough surface such as conical tip, plane, big conical pit, small conical pit and its influencing factors, showing that small conical pit has excellent condition of nucleation and the depth of critical conical pit is the necessary condition which decide whether small conical pit can produce the natural ice core, and the process of heterogeneous nucleation on solid surface has the properties of priority and decay. Based on the law of influence of conical pits on nucleation, the research also shows that there are three ways of how solid surface roughness influence nucleation rate: changing the apparent contact angle, forming the surface of ice-base mixed and increasing the surface area. This article can provide theoretical guidance for enhancing or restraining surface freezing through the way of surface modification.