Abstract
In this paper, full-film lubrication between the rigid smooth and dimpled surfaces was addressed. A theoretical model is developed to study the effect of a dimple on friction where the smooth surface is rotating while the dimpled surface is at rest. To simplify the problem, the magnified dimple cell is investigated along with some assumptions. Because dimples deploy periodically along with the x and y directions, the lubricant pressure also deploys periodically. A theoretical model can be developed for one cell and then extended to the whole surface. The main goal of this study is to understand the dimple effect on friction in a hydrodynamic lubrication regime. The main applications of this model are several types of bearings (point contact, line contact etc.) and mechanical parts where two surfaces interact in relative motion. Findings the optimum dimensions for the dimples also seem to be one of the interesting research areas in mechanization of agricultural and renewable energy sources.
Highlights
Some researchers have presented the various influences of dimples by investigating the pressure distribution, film thickness, and friction coefficient
Theoretical Model Considering the Effect of Dimple on Friction To better understand the effect of dimples on the tribological performance of the parallel surfaces in relative motion and simplify the existing problem, the following assumptions have been made: 1) As the ball is rigid, local elastic deformation is neglected
Distance between dimples is kept the same towards local Cartesian coordinate system x*y*. 4) The model is only valid for the hydrodynamic lubrication regime
Summary
Some researchers have presented the various influences of dimples by investigating the pressure distribution, film thickness, and friction coefficient. Yu and Sadeghi [1] developed a model for a thrust washer containing uniformly distributed radial grooves on the fixed thrust surface They included the effects of lubricant cavitation in their model. Design curves were generated for load support, friction, and other operating parameters as a function of dimple geometry They further extended their model by including a thermal effect on thrust washer lubrication. The friction and temperature were measured and compared with the predictions of a 2D steady-state hydrodynamic model Their model indicated that the depth-to-diameter ratio was more influential on the pressure generation than the density of dimples. An analytical model was developed to compare to the experimental results
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