Prediction of the Viscosity for Molecular Fluids from the Dilute-Gas Properties via the Inversion Procedure for Spherically Symmetric Pair Potentials

摘要

A prediction scheme is presented for the viscosity and translation part of the thermal conductivity ("frozen" thermal conductivity) of molecular fluids via the application of the original inversion algorithm for spherically symmetric pair potentials. The latter allows us to invert the centrally symmetrical effective interaction potential for two types of dilute-gas properties-the pressure second virial coefficient and the low-density gas viscosity. Such a potential is then used for the computation of fluid transport properties. Several weakly anisotropic molecular systems were considered (N_2, O_2, CO_2, CH_4). Analysis of the results obtained reveals that the class of spherically symmetric potentials may still be used for the prediction of fluid transport coefficients from the dilute-gas equilibrium and kinetic characteristics.