In this work, numerical results are presented for velocity and heat-flow profiles and particle and heat-flow rates of a rarefied gas confined in a plane channel defined by two parallel plates subject to a temperature gradient. The problem is modeled by the BGK kinetic equation and two different types of surface-gas interaction law are analyzed, i. e., the Cercignani-Lampis model that is defined in terms of normal and tangential accommodation coefficients and the usual Maxwell model. Here, the two parallel plates have different chemical compositions, i. e., with different accommodation coefficients. A modern analytical version of the discrete-ordinates method (ADO) is used to solve this problem and a detailed analysis is performed in regard to the influence of the surfaces on the physical quantities.
Rarefied gas dynamics; the analytical method of discrete-ordinates; the Maxwell model; the Cercignani-Lampis kernel
