Transport Properties of Gases with Rotational States. II

Abstract

When a single‐component gas possesses a nonzero but small local angular‐momentum density, the left‐hand side of the Boltzmann equation used for calculation of the transport coefficients must be modified in order to take into account the noncommutative properties of the internal angular‐momentum pseudovector operator J. Such a modified Boltzmann equation is herein obtained and a tensorial expansion of the perturbation function φ in terms of irreducible Cartesian tensors is carried out. Expressions are obtained for the various transport coefficients connected with the pressure tensor, angular‐momentum flux tensor, and heat‐flux vector in terms of certain tensorial expansion coefficients. In particular, a nonzero local angular‐momentum density is found to lead to a number of cross terms in the expressions for the macroscopic fluxes.