Exploring the Impact of Temperature differences Between Roller and Raceway on TEHL in Rolling Element Bearings by employing a 2D CFD-FSI Modeling Approach

In the field of elastohydrodynamic lubrication (EHL), the influence of temperature differences between components has often been disregarded in calculations and simulations. Therefore, this study focuses on examining the effects of solid body temperatures on two-dimensional line contacts (2D-TEHL), specifically with respect to film thickness and the coefficient of friction (CoF), the two pivotal parameters in lubricating bearing systems. 
A significant finding of this research is the substantial influence of elevated raceway temperatures on both film thickness and CoF, which arises from the heat transfer process between a heated surface and the lubricating oil. In comparison to the effect of inlet shear heating, this heat transfer induces a more pronounced temperature elevation within the contact region of the oil. Consequently, the study emphasizes the importance of incorporating temperature gradients into the analytical framework used for bearing contact assessments. This inclusion is found to be critical for enhancing the accuracy of predictions regarding film thickness and CoF in lubricated systems.
Furthermore, the findings of this research show that applying oil/raceway cooling or heating can be influential in controlling friction or film thickness in bearing systems. This temperature management approach presents promising avenues for optimizing the performance of lubricated bearing systems, offering a significant stride towards enhanced efficiency and longevity. This emphasizes the importance of considering temperature changes in EHL analyses and shows how adjusting temperatures can enhance bearing system performance.