Influence of surface roughness on non-Newtonian thermohydrostatic performance of a hole-entry hybrid journal bearing

A general solution scheme to account the staface roughness and the cross-film viscosity variation of lubricant due to its non-Newtonian behavior and rise in fluid-film temperaturefor the analysis offluid-film bearings is presented. The combined influence c!f surface roughness, non-Newtonian behavior of lubricant, and thermal effects on the performance Qf a hole-entry hybrid journal bearing system has been investigated. The surface roughness, especially stationary roughness (i.e., rough bearing and smooth journal) n4th a transverse pattern was found to partially compensate for the loss in load-cartying capacity due to the thertnal andlor non-Newtonian behavior C!f lubricant effects. It limits 18.86% loss in load-carrving capacity due to the thermal effect to only 1.6% and 33.99% loss due to the combined influence of non-Newtonian lubricant and thermal effect to 16.76%.