Multicomponent gas transport coefficients: Alternate formulations.

The phase rule states that a fluid element is detd. locally by c + 1 independent intensive variables when there are c components. In solving the Boltzmann equation for gas transport coeffs., the std. procedures involve only c independent gradients of intensive variables for the local properties (exclusive of the convective motion). This paper addresses this disparity and proposes an alternative set of gradients when solving the Boltzmann equation. The consequence is added terms in the expressions for the thermal diffusion coeffs. As well, the std. expression for the binary diffusion const. is identified as being valid only at const. total d. Irreversible thermodn. is used as a ref. base for comparing the alternate formulations. [on SciFinder(R)]