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Modeling the Pressure-Density Relationship in Thin Films at Asperity Contacts in Mixed Lubrication

[+] Author Affiliations
A. Martini, R. Cantrell, Q. Wang, R. Q. Snurr

Northwestern University, Evanston, IL

Paper No. WTC2005-64347, pp. 933-934; 2 pages
doi:10.1115/WTC2005-64347
From:
  • World Tribology Congress III
  • World Tribology Congress III, Volume 1
  • Washington, D.C., USA, September 12–16, 2005
  • Conference Sponsors: Tribology Division
  • ISBN: 0-7918-4201-0 | eISBN: 0-7918-3767-X
  • Copyright © 2005 by ASME

abstract

In mixed lubricated contact, the asperity contact regions may be separated by a thin layer of lubricant film. Simulations of mixed lubrication often use empirical formulae to describe the change of density with pressure in the lubricated areas. However, these models may not be applicable to molecularly thin films at asperity contact regions. We present a molecular simulation approach for density characterization of the fluid at asperity contact regions in mixed lubrication. The resultant density-pressure relationship is compared to the traditional Dowson-Higginson model. It is found that the two models predict comparable densities at low pressures but diverge at higher pressures.

Copyright © 2005 by ASME

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