Effects of rotationally inelastic collisions on gaseous transport coefficients

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Abstract
The Monchick, Yun, and Mason generalization of the Wang Chang–Uhlenbeck–deBoer formulation of kinetic theory is the starting point for the generalized phase shift (GPS) evaluation of the transport coefficients. It is shown that the expressions for these properties can be written in terms of the rotational energy moments of the degeneracy averaged cross sections. The appropriate thermal averages of these ’’cross sections’’, referred to as collision integrals, are numerically evaluated. These quantities are then used to determine the values of the coefficients of binary diffusion, viscosity, thermal conductivity, and thermal diffusion. Calculations are made for gaseous systems consisting of a dilute mixture of a diatomic species in an excess of an atomic species. The diatomic is treated as a rigid rotor, and the effects of rotational inelasticity on the transport coefficients are analyzed.

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