Abstract
To examine molecular gas film lubrication (MGL) characteristics for spacings of several nanometers, the free molecular MGL equation, which assumes that the flow in the lubrication region is the free molecular flow and involves the Poiseuille flow rate and the shear stress coefficient for the free molecular flow region with surface accommodation coefficients as parameters, is established. The usefulness of the free molecular MGL equation for the spacings of less than several nanometers is shown by comparing with the numerically calculated characteristics of flying head sliders using the conventional expression of the MGL equation with accommodation coefficients of running disk and slider, α0 and α1, as parameters. The static pressure generation is found to depend only on the accommodation coefficient of the running disk in the free molecular region.
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