混合流体汽液及液液界面张力分子模型

应用定标粒子理论表面张力方程以及 vd W- 1型混合规则 ,计算了混合流体的表面张力 ,对 64个二元体系 ,7个三元体系的表面张力计算平均相对偏差为 0 .80 %和 2 .43% ;应用 Boudh- Hir和 Mansoori提出的部分互溶体系的界面张力模型 ,给出了硬球直径的确定方法 ,对 37个部分互溶二元含水体系的界面张力进行了计算 ,绝对平均偏差为 1 .5m N/m,相对平均偏差为 8.9% ,计算精度满意。

Molecular Model of Vapor-Liquid,Liquid-Liquid Interfacial Tensions for Fluid Mixtures

For the prediction of vapor liquid interfacial tension(or surface tension) of fluid mixtures,hard sphere surface tension model of pure liquid proposed by Reiss has been extended to mixtures using two vdW 1 mixing rules.The surface tensions for 64 binary liquids have been correlated with only average relative deviations of 0.80%.With the parameters obtained from the correlation of binary system data,this method has been satisfactorily applied to predict the surface tension of 7 ternary systems,the deviation being 2.43%.Besides,the liquid liquid interfacial tension model derived by Boudh Hir and Mansoori is used to calculate interfacial tension for binary systems.For 37 binary partially miscible systems,the average absolute deviation and relative deviation are 1.5mN/m and 8.9% respectively.The results for surface tension and interfacial tension show that these two methods used in this paper are simple and accurate to engineering application.