Abstract
A thermal problem and the Couette flow of a rarefied argon gas between two platinum walls are considered to investigate the characteristics of the reflected gas molecule at a physically adsorbed surface by H_2O molecules. The analysis is based on the molecular dynamics (MD) method for the interaction of gas molecules with the adsorbed wall surface together with the direct simulation Monte-Carlo (DSMC) method for the motion of gas molecules. The accommodation coefficients of momentum and translational energy of the molecule are obtained. The temperature and flow velocity distribution between two walls and the distribution function of the reflected molecule are also obtained. It is found that the tangential momentum accommodation coefficient of the adsorbed surface is much larger than that of a clean surface. The Maxwell-type distribution function consisting of specular and diffuse reflection well describes the distribution function of the reflected molecules if the accommodation coefficient involved is chosen properly.
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