Effects of Skew Unidirectional Striated Roughness on Hydrodynamic Lubrication: Part 2—Moving Roughness

The author’s work on the lubrication of unidirectional striated roughness at arbitrary angles to the direction of motion has been extended to the case of moving roughness. The previously derived equations are applied to plane inclined pad bearings and solved for various parameter values. The results bring out strong effects that may be useful for bearing design optimisation. As in the case of stationary roughness, the main effect is the generation of a crosswise shear flow component that may improve bearing cooling considerably, or blocked, may generate higher pressures. It is concluded that stationary roughness seems to be preferable to a moving roughness pattern, but that a bearing surface pair having a crossed groove orientation is probably the best.