The frictional properties of newtonian fluids in rolling-sliding soft-EHL contact

de Vicente, J., Stokes, J. R. and Spikes, H. A. (2005) The frictional properties of newtonian fluids in rolling-sliding soft-EHL contact. Tribology Letters, 20 3-4: 273-286. doi:10.1007/s11249-005-9067-3

Author de Vicente, J.
Stokes, J. R.
Spikes, H. A.
Title The frictional properties of newtonian fluids in rolling-sliding soft-EHL contact
Journal name Tribology Letters   Check publisher's open access policy
ISSN 1023-8883
Publication date 2005-12
Sub-type Article (original research)
DOI 10.1007/s11249-005-9067-3
Volume 20
Issue 3-4
Start page 273
End page 286
Total pages 13
Place of publication Bussum, Netherlands
Publisher Baltzer Science Publishers
Language eng
Subject 09 Engineering
Abstract A combined experimental and numerical study has been carried out to explore friction in rolling-sliding, soft-EHL contact. Experimental work has employed corn syrup solutions of different concentrations in water to provide a range of lubricant viscosities and has measured Couette friction in mixed rolling-sliding conditions over a wide range of entrainment speeds. A Stribeck curve has been generated, ranging from the boundary to full film, isoviscous-elastic lubrication regime. In the latter regime, friction coefficient is approximately proportional to the product of (entrainment speed x viscosity) raised to the power 0.55. Numerical solution of the isoviscous-elastic lubrication regime has been used to derive predictive equations for both Couette and Poiseuille friction in circular, soft-EHL contacts. This shows that in soft-EHL the Poiseuille or "rolling" friction can have magnitude comparable to the Couette friction. The calculated Poiseuille friction coefficient can be predicted from non-dimensional load and speed using a simple power law expression similar to that used for film thickness. However accurate prediction of calculated Couette friction coefficient requires a two-term power law expression. Comparison of experimental and numerical Couette friction coefficients shows quite good agreement between the two, with a similar non-dimensional speed dependence, but slightly lower predicted than measured values.
Keyword soft-EHL
Couette friction
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Created: Wed, 01 Jul 2009, 16:04:07 EST