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Prediction of Viscosity-Shear Properties for VI Improved Crankcase Oils
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1994 by SAE International in United States
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This study evaluates the shear-thinning effects of a commercial Viscosity Index (VI) improver in a variety of mineral oil base stocks to produce a series of viscosity grades from 0W-20 to 20W-50. All of these fluids also include a DI package in addition to an olefin copolymer VI improver and base oil. The Penn State high shear capillary viscometer was used to collect the primary data at shear rates of up to 106 s-1 and at 10 to 177°C. Data are fitted to a double truncated power law model to determine the incipient non-Newtonian shear rate Υ̇1, the power law index n, and the incipient second Newtonian shear rate Υ̇2. These parameters are found to be smooth functions of temperature and polymer concentration in the different base stocks. Using the data obtained from OW-20, 10W-30, and 20W-50 SAE grade formulations, these parameters (Υ̇1, Υ̇2 and n) are correlated as functions of temperature, polymer concentration, and a viscosity temperature property of the base oil.
These correlations were then used to predict Υ̇1, Υ̇2 and n for 10 additional multigrade lubricants formulated with the same VI additive. These three parameters and the Newtonian viscosity of these oils at 150°C predicted high temperature-high shear values at 104, 105, and 106 s-1 with the same precision as direct measurement with the Penn State high temperature, high shear viscometer. Consequently, this paper presents a method of predicting blend properties from a simple calibration system for blends of a single VI polymer in a relatively homogeneous set of base oils.
CitationKlaus, E., Duda, J., and Bala, V., "Prediction of Viscosity-Shear Properties for VI Improved Crankcase Oils," SAE Technical Paper 940819, 1994, https://doi.org/10.4271/940819.
SAE 1994 Transactions: Journal of Fuels and Lubricants
Number: V103-4; Published: 1995-09-01
Number: V103-4; Published: 1995-09-01
- Stewart, R. M. Selby, T. W. “The Relationship Between Oil Viscosity and Engine Performance -- A Literature Search,” SAE Paper No. 770372 SAE 1977
- Klaus, E. E. Shah, P. Krishnamachar, V. “Development and Use of the Microoxidation Test with Crankcase Oils,” Proceedings of the Conference on Measurements and Standards for Recycled Oil 155 168 1982
- Perez, J. M. Kelly, F. A. Klaus, E. E. Bogrodia, V. “Development and Use of the PSU Microoxidation Test for Diesel Engine Oils,” SAE Paper No. 872028 1987
- McMillan, M. L. Opening Address at SAE Open Forum Detriot, Michigan Feb. 26 1976
- Workshop Summary, Workshop I High Shear High Temperature Viscometry The 1981 International Conference on the Viscometry of Automotive Lubricants 1981
- ASTM ‘The Relationship between High Temperature Oil Rheology and Engine Operation - A Status Report’ ASTM Philadelphia 1984
- Balasubramaniam (Bala), V. “High Shear Rheology of Multigrade Lubricants,” The Pennsylvania State University 1992
- Klaus, E. E. Fenske M. R. “The Use of ASTM Slope for Predicting Viscosities,” ASTM Bulletin No. 215 87 94 1956
- Lee, F. L. “Measurement and Analysis of High Shear Viscosities of Polymer-Containing Lubricants,” The Pennsylvania State University 1985
- Lin, S. C. “Rheological Studies of Polymer Solutions at High Shear Rates,” The Pennsylvania State University 1988
- Klaus, E. E. Angeloni, F. M. Fenske, M. R. “Development and Application of the PRL Single-Pass Capillary Viscometer,” ASTM Sp. Tech. Publication 28 48 1961
- Melodick, T. Thesis M.S. “High Shear Behavior of Polymer Containing Lubricants,” The Pennsylvania State University 1988
- Duda, J. L. Klaus, E. E. Lin, S. L. Lee, F. L. “High Shear Viscosity Studies of Polymer Containing Lubricants,” Proceedings Leeds-Lyons Conference Leeds, England 1986
- Duda, J. L. Klaus, E. E. Lin, S. C. “Capillary Viscometry Study od non-Newtonian Fluids: Influence of Viscous Heating,” Ind. Eng. Chem. Res. 27 2 352 361 1988
- Wu, C. S. Melodick, T. Lin, S. C. Duda, J. L. Klaus, E. E. “The Viscous Behavior of Polymer-Modified Oils Over a Broad Range of Temperature and Shear Rate,” J. of Tribology 112 417 425 1990
- Klaus, E. E. Duda, J. L. Bala, V. “Prediction of High Temperature Viscosities of Polymer Solutions up to 107 s-1 Shear Rates,” SAE Paper No. 912411 1991
- Bala, V. Klaus, E. E. Duda, J. L. Palekar V. “Extension of the Temperature and Shear Rate Range for Polymer Containing Lubricants Using the Cannon HTHS Capillary Viscometer,”
- Venerus, D. Klaus, E. E. Duda, J. L. “Low-Temperature Rheological Studies of Hydrocarbon Base Lubricants,” SAE Paper No. 872048 1987