Influence of dimple geometry and micro-roughness orientation on performance of textured hybrid thrust pad bearing

Effect of geometric shape of micro-grooves on the performance of textured hybrid thrust pad bearing

“…This is because RBC being non-mass conserving in cavitation region does not predict boundary or onset of film reformation. The location of reformation of fluid film is described by Jacobson et al [14,20,21] as:…”

“…Artificially induced micro-texture over the bearing surface can be generated in the form of well-organized and defined discrete features (micro-dimples) or as continuous features (micro-grooves). Over the last two decades, several researchers have investigated the performance of thrust washer [8], thrust pad bearings [9][10][11][12][13][14], journal bearings [15], piston rings [16][17][18] and mechanical seals [19][20][21] with artificially induced micro-texture over the bearing pad surfaces. Yu and Sadeghi [8] investigated the influence of groove geometry on the performance of thrust washer operating in hydrodynamic lubrication, using control volume finite difference approach.…”

“…The authors have recommended using square dimple with aspect ratio lying between 0.3 and 0.5 to have better hydrodynamic performance from sliding parallel contacts. Kumar and Sharma [14] have theoretically examined the influence of providing micro-dimples of various geometric shapes and configurations on the static and dynamic performance parameters of hybrid thrust bearings. It has been found that producing micro-dimples can have beneficial (half section) as well as detrimental effect (full section) on steady-state and dynamic performance of the thrust bearing.…”

“…It only predicts the onset of film rupture and does not provide the location of film reformation. A number of mass conserving algorithms are developed by researchers [14,20,[22][23][24][25] over the time to implement Jakobsson-Floberg-Olsson (JFO) boundary condition. Initially, Elrod [22] developed a computational scheme based on mass conserving JFO boundary condition.…”

“…The detailed analysis dealing with coupled solution of Navier-Stokes equation and mass conservation/ continuity equation for electrically conducting lubricant has been provided in "Appendix 1" of the manuscript. This coupled solution yields modified Reynolds equation for electrically conducting lubricant as provided as follows: [14,20] based on the realistic JFO boundary condition, making it valid for both full film as well as cavitation region.…”