Abstract
The gas-wall interaction is investigated for the flow between two walls. The method of analysis is based on the molecular dynamics method together with DSMC method. The gas is taken to be N_2 and the wall consists of Pt molecules. Two cases of wall surface are considered: smooth surface and the surface with adsorbates. The momentum and energy accommodation coefficients are obtained. The Maxwell-type boundary condition is found to well describe the distribution function of the reflected molecules.