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 andconical pit as a geometric model of common solid surface roughness, based on the classicalnucleation theory, the research includes nucleation power on the rough surface such as conicaltip, plane, big conical pit, small conical pit and its influencing factors, showing that smallconical pit has excellent condition of nucleation and the depth of critical conical pit is thenecessary 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 anddecay. Based on the law of influence of conical pits on nucleation, the research also showsthat there are three ways of how solid surface roughness influence nucleation rate: changingthe apparent contact angle, forming the surface of ice-base mixed and increasing the surfacearea. This article can provide theoretical guidance for enhancing or restraining surfacefreezing through the way of surface modification.