Abstract: A New statistical thermodynamic model of surface tension for liquid mixtures is developed by using Davis model.When molecular energy parameter is considered as temperature dependent,the calculation results of surface tension for one-component system have been greatly improved.The total average relative deviation for 29 different pure liquids is less than 1.0%.The surface tension for 22 binary liquid mixtures has been also predicted and correlated,and the calculation deviations are 5.48% and 1.95% respectively.Using the adjustable parameters obtained from relevant binary systems,this equation can predict the surface tension of multicomponent liquid mixtures with good accuracy.The calculation results show that the model proposed is reliable and convenient for engineering application not only for pure liquids but also for multicomponent systems.

摘要： 运用Davis模型导出一个统计热力学的表面张力模型．对22个双组分体系的表面张力作了推算和关联，总平均相对偏差分别为5.45％和1.95％.并利用关联双组分体系得到的参数值，直接推测了三组分体系的表面张力，平均相对偏差为2.21％.结果令人满意.表明该方法简单、精确，便于工程应用．