4.7 Article

Effects of boundary slips on thermal elastohydrodynamic lubrication under pure rolling and opposite sliding contacts

Journal

TRIBOLOGY INTERNATIONAL
Volume 155, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2020.106801

Keywords

Slip length; Thermal slip length; Slip boundary condition; Thermal elastohydrodynamic lubrication

Funding

  1. Ministry of Education, Science and Culture of the Japanese Government [18H01385]
  2. Initiative for Realizing Diversity in the Research Environment by Ministry of Education, Culture, Sports, Science and Technology, Japan
  3. Grants-in-Aid for Scientific Research [18H01385] Funding Source: KAKEN

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This study investigated the effects of both velocity slip and thermal slip on film thickness in EHL contact, finding that velocity slip reduces film thickness under pure rolling contact, while both slips result in a shifted surface dimple under zero entrainment velocity (ZEV) contact.
In elastohydrodynamic lubrication (EHL) contact, the film thickness strongly depends on boundary slips, including velocity slip and thermal slip at the solid-lubricant interface. In the EHL studies published thus far, velocity slip at the solid-lubricant interface has been investigated individually without considering thermal slip. In this study, the effects of both types of boundary slip on film thickness were investigated simultaneously in rolling/sliding contact. Numerical simulations were conducted based on the modified Reynolds equation and energy equation by considering boundary slips on the sliding surface. The results indicate that the velocity slip causes a reduction in film thickness under pure rolling contact, while a shifted surface dimple is formed along the sliding direction due to both velocity slip and thermal slip under zero entrainment velocity (ZEV) contact.

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