Molecular-kinetic study of multilayers gas-adsorption in a rarefied gas environment

Gas adsorption on a solid surface commonly occurs in multiple layers. However, there has as yet been little attention paid to the molecular-kinetic processes of multilayer gas adsorption. The purpose of this study was, thus, to address this gap in the literature using simulations. The numerical approach presented herein is based on the Direct simulation Monte Carlo method and a two-way coupled-fluxes method. We found that “over-desorption” may exist in the re-balancing process of multilayer gas adsorption. In addition, the existence of transient behavior in the gas near the solid wall in the results of the two-way coupled simulations is also discussed. This work may aid the study of physical or chemical phenomena relating to a gas adsorbed onto a solid surface.