Diffusion gas slip. II - Application of the method of irreversible process thermodynamics

Phenomenological equations are derived which relate, through the Onsager relation, the diffusion slip rate to the constant-concentration diffusion of rarefied gas mixture components. The problem of the Couette flow of a diluted gas mixture is solved by the method of semispatial moments. From this solution, the diffusion slip coefficient is derived by using the principles of nonequilibrium thermodynamics. The result is found to be in exact agreement with the diffusion slip coefficient that has been calculated directly.