The low temperature rheological behavior of a number of lubricants was examined in the range of −12 to −37°C over a shear rate range of one to 1000 sec−1. Results are presented for the following fluids: a waxy mineral oil, a synthetic hydrocarbon oil (poly-alpha olefin) and four oils each containing an olefin copol ymer (OCP) viscosity index improver with different additive packages. All samples were subjected to the same cooling history consisting of a 0.56°C/min cooling rate, followed by a one hour soak period before data was collected. These data demonstrate that waxy oils without VI improvers can show non-Newtonian and viscoelastic behavior similar to data at low temperatures for polymer-thickened oils in a non-waxy solvent. Combinations of wax and VI improver can show both shear thinning and shear thickening, as well as viscoelastic properties.
Low Temperature Rheological Studies of Hydrocarbon Base Lubricants
Sae Technical Papers
1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1987
1987-11-01
Conference paper
English
Low temperature rheological studies of hydrocarbon base lubricants
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