ANALYTICAL DEPENDENCE OF THE VISCOSITY CROSS-SECTIONS AND VISCOSITY COEFFICIENTS ON PARAMETERS OF INTERMOLECULAR POTENTIALS

General analytical expressions for viscosity cross sections and viscosity coefficients of gases as functions of the parameters of intermolecular potentials are derived from the first principle using the classical scattering theory. Two types (one repulsive-attractive and one purely repulsive) of the central-force potentials, suitable to represent molecule-molecule, atom-molecule and atom-atom interactions, are considered. The expressions for viscosity show good agreement with results of numerical calculations in high-temperature single-component gases (above 2000 K) where viscosity measurements are not available.