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A correlation of surface tension of binary and ternary mixtures based on the friction theory


G. Zhao1, S. Bi1 and J. Wu1

1Key Laboratory of Thermal Fluid Science and Engineering of MOE, Xi'an Jiaotong University, Xi’an Shaanxi, P.R. China

Keywords: surface tension; UNIFAC; friction theory.
property: surface tension
material: mixture

Surface tensions of the binary and ternary mixtures equation based on the thermodynamics and Gibbs free energy applied to the liquid-vapor interface is proposed. The activity coefficient used to determine the surface tension equation was correlated by the Wilson, NRTL and UNIFAC method. The thickness of liquid-vapor interfaces was deduced from molar surface areas by fitting the experimental data. A further correlation of surface tensions of binary mixtures based on friction theory applied to the liquid-vapor interfaces was presented. The Peng-Robinson equation of state was chosen to describe the two phase systems. As a result, the method was proved to have a high accurate correlation of the surface tension of binary mixtures.


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