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Viscosity Prediction for Multigrade Oils
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Abstract
The variation of viscosity with temperature and shear rate plays an important role in the analysis of lubrication of automotive systems. In this paper, a method for predicting the viscosity of non-Newtonian fluids, such as multigrade engine oils, over a wide range of temperatures and shear rates is outlined. This expression determines viscosity parameters for shear thinning fluids in terms of easily measured viscosity values at some reference state. A comparison of predictions with experimental data suggests that viscosity for multigrade engine oils can be predicted to within experimental uncertainty.
The proposed method can be used in assessing lubricant viscosity at shear rates greater than 106 s-1, which are beyond the capability of current laboratory instruments. A comparative study with multigrade oils shows that performance at very high shear rates cannot be accurately gauged from high temperature, high shear (HTHS) viscosity measurements. To insure satisfactory performance at high shear rates, oils may have to be investigated not at isolated conditions of temperature and shear rate, but over ranges of these parameters typical of actual component operation.
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Sorab, J., Holdeman, H., and Chui, G., "Viscosity Prediction for Multigrade Oils," SAE Technical Paper 932833, 1993, https://doi.org/10.4271/932833.Also In
Tribological Insights and Performance Characteristics of Modern Engine Lubricants
Number: SP-0996; Published: 1993-10-01
Number: SP-0996; Published: 1993-10-01
References
- Barnes, J. R. Bell, J. C. “Laboratory Screening of Engine Lubricants for High Temperature Performance” Proceedings of the ASME/STLE Tribology Conference, Baltimore, Maryland, STLE Preprint No. 88-TC-6C-1 1988
- Choi, J-K. Lee, J-H. Han, D-C “Oil Film Thickness in Engine Main Bearings: Comparison Between Calculation and Experiment by Total Capacitance Method” SAE 922345 1992
- Lodge, A. S. “A New Method of Measuring Multigrade Oil Shear Elasticity and Viscosity at High Shear Rates SAE 872043 1987
- Bates, T. W. Williamson, B. Spearot, J. A. Murphy, C. K. “A Correlation Between Engine Oil Rheology and Oil Film Thickness in Engine Journal Bearings” SAE 860376 1986
- Watson, R. W. McDonnell, T. F. “Additives - The Right Stuff for Automotive Engine Oils” International Off-Highway & Powerplant Congress and Exposition Milwaukee, Wisconsin 1986
- Cryvoff, S. A. Spearot, J. A. Bates, T. W. “Engine Bearing Oil Film Thickness Measurement and Oil Rheology - an ASTM Task Force Report” SAE 902064 1990
- Deysarkar, A. K. “The Bearing Oil Film Thickness of Single and Multi-Grade Oils-Part 1: Experimental Results in a 3.8L Engine” SAE 880681 1988
- Spearot, J. A. Murphy, C. K. “A Comparison of the Total Capacitance and Total Resistance Techniques for Measuring the Thickness of Journal Bearing Oil Films in an Operating Engine” SAE 880680 1988
- Bird, R. B. Armstrong, R. C. Hassager, O. Dynamics of Polymeric Liquids: Fluids Mechanics John Wiley & Sons New York 2nd 171 1987
- Lodge, A. S. Elastic Liquids Academic Press New York 1964
- Change, H-F. D. Darby, R. “Effect of Shear Degradation on the Rheological Properties of Dilute Drag-Reducing Polymer Solutions” J. Soc. Rheology 27 1 77 83 1983
- Sorab, J. VanArsdale, W. E. “A Correlation for the Pressure and Temperature Dependence of Viscosity” Tribology Trans. 34 4 604 610 1991
- Philippoff, W. Gaskin, F. H. “Viscosity Measurements on Molten Polyethylene” J. Poly. Sci. 21 205 222 1956
- Vinogradov, G. V. Malkin, A. Y. “Temperature-Independent Viscosity Characteristics of Polymer Systems” J. Poly. Sci: Part A 2 2357 2372 1964
- Mendelson, R. A. “Polyethylene Melt Viscosity: Shear Rate-Temperature Superposition” Trans. Soc. Rheology 9 1 53 63 1965
- 2 Kolloid-Z 183 2 110 120 1961
- Ferry, J. D. Viscoelastic Properties of Polymers 3rd 271 John Wiley & Sons New York 1980
- Washburn, E. W. International Critical Tables of Numerical Data, Physica, Chemistry and Technology, McGraw-Hill New York 1927
- Van Wazer, J. R. Lyons, J. W. Kim, K. Y. Colwell, R. E. Viscosity and Flow Measurement - A Laboratory Handbook of Rheology 190 Interscience New York 1963
- Philippoff, W. Gaskins, F. H. “The Capillary Experiment in Rheology” Trans. Soc. Rheology II 263 284 1958