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Characterisation of the Viscoelasticity of Engine Lubricants at Elevated Temperatures and Shear Rates
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Abstract
Most automotive multigrade oils contain high molecular weight polymeric viscosity index improvers (VIIs) and are to a greater or lesser extent, viscoelastic liquids. A way of characterising lubricant viscoelasticity (as typified by the first normal stress difference) using slit die rheometry is described in this paper. This technique has been applied to measure the viscoelasticity of several conventional multigrade oils at temperatures and shear rates close to that experienced by the lubricant in an automotive journal bearing. Additionally, the potential of slit die rheometry as a technique to measure the viscosity of engine oils at shear rates up to 2 X 106s-1 is assessed.
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Citation
Williamson, B. and Milton, A., "Characterisation of the Viscoelasticity of Engine Lubricants at Elevated Temperatures and Shear Rates," SAE Technical Paper 951032, 1995, https://doi.org/10.4271/951032.Also In
References
- Tanner, R.I. “Some Illustrative Problems in the Flow of Viscoelastic Non - Newtonian Lubricants.” ASLE Trans. 8 179 1965
- Davies, J.M. Walters, K. “The Behaviour of Non - Newtonian Lubricants in Journal Bearings - A Theoretical Study” Rheology of Lubricants Davenport T. App. Sci. Publishers Barking 1973
- Gupta, R.K. Deysarker, A.K. “Flow of Multigrade Motor Oils in an Extensional Flow Field” J. Rheol. 34 1373 1990
- Lodge, A.S. “A New Method of Measuring Multigrade Oil Shear Elasticity and Viscosity at High Shear Rates” SAE Paper No. 872043 1987
- Hutton, J.F. Jackson, K.P. Williamson, B.P. “The Effects of Lubricant Rheology on the Performance of Journal Bearings” ASLE Preprint No. 84-LC-1C-1 1984
- Bates, T.W. Williamson, B.P. Spearot, J.A. Murphy, C.K. “A Correlation Between Engine Oil Rheology and Oil Film Thickness in Engine Journal Bearings” SAE Paper No. 860376 1986
- Lodge, A.S. Chem. Engr. Commun. 32 1 1985
- Lodge, A. S. “Physical Principles of Rheological Measurement” Collyer Clegg Elsevier Sci. Pubi., London 1988
- Higashitani, K. Pritchard, W. G. Trans. Soc. Rheol. 16 687 1972
- Baird, D. G. Trans. Soc. Rheol. 19 147 1975
- Jackson, N.R. Finlayson, B.A. “Calculation of Hole Pressure: 1. Newtonian Fluids” Journal of Non-Newtonian Fluid Mechanics 10 1982 55 69
- Lodge, A. S. private commun 1993
- Walters, K. “Rheometry” Chapman and Hall London 1975
- Lodge, A.S. Private Communication 1990
- Ko, Y.S. Lodge, A.S. “Viscous Heating Correction for Thermally Developing Flows in Slit Die Viscometry” Rheol. Acta. 30 4 1991
- Barnes, H.A. Hutton, J.F. Walters, K. “An Introduction to Rheology” Elsevier 1989
- Hutton, J.F. Private Communication 1988
- Williamson, B.P. Milton, A.L. Bates, T.W. Coy, R.C. Walters, K. “The Rheometrical Properties of Lubricating Oils” Jour. of Non-Newt. Fluid Mech.
- Ferry, J.D. “Viscoelastic Properties of Polymers” Wiley 1980