Prediction of viscosity for R142b, R152a at the zero density regime by a semi-empirical method

Abstract

An new inversion method is presented for obtaining the interaction potential pairs for 1-choloro-1,1-difluoroethane and 1,1-difluoroethane utilizing the extended corresponding states approach of Huber <i style="">et al.</i> [Huber M L, Laesecke A, Perkins R A, <i>Ind Eng Chem Res</i>, 42 (2003) 3163]. The calculated inverted potentials have been used in evaluating the viscosity coefficients for gaseous state of both the compounds in dilute gas density regime. Due to the iterative nature of the present method the Lennard-Jones 12-6 (LJ 12-6) potential model has been implemented initially. The interaction potential energies from the inversion method reproduce the viscosity and are commensurate within the uncertainty of the best measurements which can be applied to a wide span of temperature range. The reduced collision integrals and their ratios have also been estimated.