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IJCT Vol.13(2) [March 2006] >

Title: Rheology of multigrade engine oils
Authors: Tanveer, Sabiha
Sharma, Umesh Chandra
Prasad, Ram
Keywords: Rheology
Multigrade engine oil
Shear rate
Issue Date: Mar-2006
Publisher: CSIR
IPC CodeC10M107/00
Abstract: Rheology of multigrade engine oils, SAE 15W-40, SAE 20W-40, SAE 20W-50 and SAE 25W-50 has been examined experimentally in the temperature range of -20 to 20°C. Experiments have been carried out to observe the dependence of shear rate, time and temperature on the apparent viscosity of these multigrade engine oils. The oils SAE 15W-40 and SAE 20W-40 are found to behave as Newtonian fluids above a temperature of about 5°C. The oils SAE 20W-50 and SAE 25W-50 are found to behave as Newtonian fluids above a temperature of about 10°C. Below these temperatures, they behave as dilatant fluids. These oils also exhibit a rheopectic behaviour. The apparent viscosity of these multigrade engine oils decreases with increase in temperature.
Page(s): 180-184
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.13(2) [March 2006]

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