1前言用晶体表面加热其它介质是普遍存在的换热现象,其中对流换热是主要的换热方式之一.对其换热机理,有关研究人员进行了广泛深人的研究,取得了许多重要成果［''－''］.但迄今还缺乏统一的认识,没有形成系统的理论,其原因之一可能是由于人们总是把进行热交换的双...“,”This paper considers the mechanism of convection heat transfer on heated crystal surface. The heat transfer process is tried to divide into three links. Phonon theory is used to study and define “convective power” of crystal. The results indicated that convection heat transfer process is discrete. The order of convective power of crystal is extremely high and is approximately proportional to T4ω~T1ω. It can be regarded that the heat exchange is finished in the course of one collision between the heated solid and particles of media that is demonstrated by thermal conduction in gas. The value of heat transfer coefficient is depending on the properties, states and motion of media.