Abstract
The effects of surface roughness on the molecular gas lubrication characteristics have been studied and it has become clear that the transverse flow, which is neglected in conventional molecular gas lubrication (MGL) equation, appears in the lubrication film as the roughness slope increases. In this paper, the detail of the transverse flow in the wide range of Knudsen number was analyzed by using direct simulation Monte-Carlo (DSMC) method. It was clarified that the transverse flow is caused by the slip flow on the slope of rough surface．The transverse flow exists only around the rough surface in the case of small Knudsen number, though the flow extends in whole area of lubrication film against large Knudsen number. The flow through the lubrication film complementary decreases as the transverse flow increases.
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