Abstract
Rarefied gas flows in narrow spaces are affected by the surface roughness of walls of the passage, but the interaction between gas molecules and solid surfaces has not been understood sufficiently. The effects of surface roughness on the conductance of passages composed of two flat plates are studied experimentally and theoretically. In order to simplify the conditions for calculation, two dimensional triangular waves of constant amplitude are chosen, and such shape of roughness is actually cut on to plates by the machining process. The Monte Carlo method is used for calculation. Both the experimental and the theoretical results show that the conductance decreases with the increase in the angle of triangular wave, and the effects of the angle become more remarkable at larger inverse Knudsen numbers.
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