Variation of surface dimple in point contact thermal EHL under ZEV condition

• Published in: Tribology international Vol. 94; pp. 383 - 394
• Main Authors: Zhang, Binbin, Wang, Jing, Omasta, Milan, Kaneta, Motohiro
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2016
• Subjects: Centralized dimple; Computational fluid dynamics; Dimpling; Fluids; Mathematical models; Newtonian fluids; Point contact; Shear stress; Thermal EHL; Traction; ZEV; ZEV; Point contact; Centralized dimple; Thermal EHL
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2015.09.036

This paper focuses on the variation of the surface dimple in point contact thermal elastohydrodynamic lubrication (EHL) under zero entrainment velocity (ZEV) condition theoretically by employing Newtonian and Ree–Eyring fluid models. From higher surface velocity to lower value, both fluid models predict that the depth of dimple increases before lowering again while the Newtonian central pressure keeps rising and the Ree–Eyring one increases before showing a constant value. Moreover, there are differences in the distributions of shear stress, temperature rise, maximum temperature rise and traction coefficient. Finally, the influence of load on the dimple is also investigated. For the same load, the Newtonian fluid model predicts a deeper and slimmer centralized dimple. Pressure and film thickness distributions on the plane Y=0 using different surface velocities for Newtonian fluid. [Display omitted] •Given the effects of rheology, velocity and load on thermal EHL at ZEV condition.•Newtonian and Ree-Eyring fluid models give the same trend under high velocity.•The decreasing low velocity raises pressure and decreases dimple depth.•Even lower decreasing velocity does not alter Ree-Eyring fluid central pressure.•The Newtonian fluid model predicts a deeper and slimmer centralized dimple.