%0 Journal Article
%T Investigation on the rheological behavior of coconut oil based hybrid CeO2/CuO nanolubricants
%A Ayamannil Sajeeb
%A Perikinalil Krishnan Rajendrakumar
%J Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
%@ 2041-305X
%D 2019
%R 10.1177/1350650118772149
%X In the present work, hybrid CeO2/CuO¨Ccoconut oil nanolubricants in different weight fractions are prepared for different proportions of CeO2 and CuO namely 25/75, 50/50, and 75/25. Experimental and theoretical studies are carried out to investigate the rheological behavior of these hybrid nanolubricants with different proportions CeO2/CuO at a temperature range of 30£¿¡æ to 90£¿¡æ and various shear rates for different total concentrations (wt%) ranging from 0% to 1%. For higher concentrations and lesser shear rates, non-Newtonian behavior is observed for each proportion of CeO2 and CuO. Nanoparticle¨Coil interactions play an important role for non-Newtonian behavior at higher concentrations. But at higher shear rates, the nanolubricants behave as Newtonian fluids at all temperatures and concentrations. The values of viscosity measured using a rheometer shows minor variations compared to the values obtained by the theoretical models due to interactions, morphology, and size effects of nanoparticles. An empirical viscosity prediction model for hybrid CeO2/CuO¨Ccoconut oil nanolubricants is proposed in terms of concentrations for various temperatures and proportions of CeO2/CuO nanoparticles based on experimental results
%K Viscosity
%K hybrid nanolubricant
%K CeO2
%K CuO
%K coconut oil
%K temperature
%K concentration
%U https://journals.sagepub.com/doi/full/10.1177/1350650118772149