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Relationship Between Temperature Distribution in EHL Film and Dimple Formation

[+] Author Affiliations
Kazuyuki Yagi

Tokyo University of Science, Tokyo, Japan

Keiji Kyogoku, Tsunamitsu Nakahara

Tokyo Institute of Technology, Tokyo, Japan

Paper No. TRIB2004-64073, pp. 459-468; 10 pages
  • ASME/STLE 2004 International Joint Tribology Conference
  • ASME/STLE 2004 International Joint Tribology Conference, Parts A and B
  • Long Beach, California, USA, October 24–27, 2004
  • Conference Sponsors: Tribology Division
  • ISBN: 0-7918-4181-2 | eISBN: 0-7918-4178-2
  • Copyright © 2004 by ASME


This paper describes an experimental study on dimple formations under elastohydrodynamic lubrication (EHL) conditions. The oil film thickness between a ball surface and a sapphire disk was measured using optical interferometry and the temperatures of both the surfaces and of the oil film averaged across it were measured by an improved infrared emission technique. It was found that temperature profile across the oil film varies abruptly along the direction of the oil film thickness and the Couette flow decreases due to the viscosity wedge action as the oil flow is close to the dimple zone. The maximum temperature rise in the dimple zone sometimes reached above 400 K and thus the phase transition of the oil from liquid to glass may not occur.

Copyright © 2004 by ASME



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