Binary diffusive-convective gas flows in a two-dimensional channel with atomically rough walls were studied by molecular-dynamics simulations. It was found that, similar to the behavior of monocomponent flows investigated in earlier work, the no-slip condition arose when the mean free path in the gas mixture was of the same order of magnitude as or smaller than the atomic-wall-roughness amplitude. However, if there were concentration gradients along the wall, the component velocities at the wall did not vanish. Thus the no-slip condition was established via the mutual cancellation of the non-vanishing, opposing slip velocities of the components.

Molecular-Dynamics Simulations of Flow with Binary Diffusion in a Two-Dimensional Channel with Atomically Rough Walls. Mo, G., Rosenberger, F.: Physical Review A, 1991, 44[8], 4978-85