固体 PCM 在热球体外表面上接触融解时液膜厚度变化规律的研究

基于润滑近似理论和Ｎｕｓｓｅｌｔ液膜流动理论建立了一个描述固体相变材料在热球体外表面上接触融解的数理模型。由于更准确地应用了固液两相界面处能量平衡关系式，所以求解所得的融解液液膜厚度分布更合理。据此模型，还指出了文献中模型存在的问题及其得到错误液膜厚度分布的原因。

ANALYSIS OF MELT FILM THICKNESS PROFILE IN PCM SOLID CLOSE CONTACT MELTING AROUND A HOT SPHERE

Based on the theories of lubrication approximations and Nusselt liquid film flowing,a model describing close contact melting of phase change solid around a hot sphere is developed by applying a more stringent energy balance relation at the two phase interface.The dimensionless number F,which represents the force acting over the melt film,and Ste number are the two major factors to affect melt film thickness profile.It is shown from the calculated results that the melt film thickness profile is more reasonable than that obtained in literature.The reason why a paradoxical solution of melt film thickness profile existed in literature is also discussed.