Abstract
Effects of surface grooves on the rarefied gas flow through a channel are investigated numerically using the linearized B-G-K equation. One wall of the channel has rectangular grooves engraved periodically parallel or normal to the flow direction, and the other wall is flat. Couette and Poiseuille flows are analyzed. It is shown that in case of normal grooves, the flux through the channel has a minimum when the depth of the groove is about half of its width. For parallel grooves, the flux is considerably low compared with that of the smooth walls of the channel when the groove width and pitch are comparatively smaller than the channel width.
