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The Effect of Shear Rate and Shear Stress on Viscosity Determinations at Low Temperatures for Engine Oils
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1990 by SAE International in United States
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The viscosity of engine lubricants was measured at multiple shear rates by a unique Scanning Brookfield apparatus. These oils included both Pumpability Reference Oils (PRO) and a selection of today's commercial multigrade oils. It was found that the viscosity of “flow-limited” oils remained constant when the shear rate decreased. Oils with “air-binding” properties exhibited an increase in viscosity with decreasing shear rate. The magnitude of a change in “slope of the temperature/viscosity profile was found to suggest the degree of air-binding character of an oil.
The flow characteristics of PRO 1, 3, 9, 11, and 16 were measured at several shear stresses and temperatures in the Mini-Rotary Viscometer. The Scanning Brookfield technique and the Mini-Rotary Viscometer were found to yield similar results when the shear stress of the Mini-Rotary Viscometer was reduced from 525 to 35 Pascals.
CitationHenderson, K. and Sicking, J., "The Effect of Shear Rate and Shear Stress on Viscosity Determinations at Low Temperatures for Engine Oils," SAE Technical Paper 902091, 1990, https://doi.org/10.4271/902091.
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