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Elastohydrodynamic Line-Contact of Compressible Shear Thinning Fluids With Consideration of the Surface Roughness

J. Tribol.  -- July 2010 --  Volume 132,  Issue 3, 034501 (6 pages)
doi:10.1115/1.4001787

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Author(s):
J. Y. Jang and M. M. Khonsari
Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803
Applications involving highly loaded elastohydrodynamic lubrication (EHL), particularly when the lubricant experiences shear thinning, operating with small film thicknesses may necessitate consideration of surface asperities. A modified Reynolds equation with provision for surface roughness and shear thinning is treated to predict the pressure and surface asperity effect in an EHL line-contact. The unknown in the Reynolds equation is the hydrodynamic pressure instead of the total pressure to ensure that the pressure boundary condition at the outlet is properly posed. The Carreau viscosity model is used for characterizing the shear thinning behavior, Patir and Cheng flow factors for taking into the influence of roughness on the lubricating film, and Greenwood–Trip for determination of pressure at the asperity level. The modified Reynolds equation is solved for the hydrodynamic pressure instead of the total pressure with appropriately defined boundary conditions.

©2010 American Society of Mechanical Engineers

History: Received 17 December 2009; revised 6 May 2010; published 24 June 2010
doi: http://dx.doi.org/10.1115/1.4001787

KEYWORDS and PACS

Keywords
PACS
  • 81.40.Pq
    Friction, lubrication, and wear
  • 47.85.mf
    Lubrication flows
  • 66.20.-d
    Viscosity of liquids; diffusive momentum transport
  • 83.50.-v
    Deformation and flow
  • YEAR: 2010

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PUBLICATION DATA

Doc Type:
Technical Brief, Technical Note, Brief Note
Coden:
JOTRE9
ISSN:
0742-4787 (print)   1528-8897 (online)
Publisher:
AIP is a member of CrossRef ASME

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