Abstract
The Couette flow of a rarefied argon gas between two platinum walls is considered to investigate the characteristics of the reflected gas molecule at physically H_2O adsorbed surfaces. The analysis is based on the molecular dynamics (MD) method for the interaction of gas molecules with the adsorbed wall surfaces together with the direct simulation Monte-Carlo (DSMC) method for the motion of gas molecules. The tangential momentum accommodation coefficients are obtained at the wall whose temperature is 300K. The flow velocity between two walls and the distribution function of the reflected molecule are also obtained. It is found that the accommodation coefficient varies with the number of adsorbed molecules.
