An experimental study on rheological behavior of SAE50 engine oil Effects of temperature and hybrid nano-materials composed of 20 vol% MWCNTs and 80 vol% TiO2

摘要

In this paper, the rheological behavior of the MWCNTs-TiO2/SAE50 hybrid nano-lubricant in solid volume fractions ranging from 0.03125 to 1% and temperatures ranging from 25 to 50 A degrees C has been examined. Samples were prepared by a two-step method and CAP2000+ viscometer was used to measure the viscosity of nano-lubricant samples at different shear rates. Applying curve fitting method on the shear stress-shear rate dependency, consistency and power law index were obtained. In addition, a new correlation has been proposed to predict the consistency of the nano-lubricant as a function of temperature and solid volume fraction. Results revealed that all samples showed Newtonian behavior at all temperatures considered. Moreover, a comparison was performed between present findings and nano-lubricant. It showed that the viscosity of the present nano-lubricant was lower than that of MWCNTs-MgO/SAE50.