The effect of multi-wall carbon nanotubes/turbine meter oil nanofluid concentration on the thermophysical properties of lubricants

This study aims to evaluate the effect of the concentration of multi-wall carbon nanotubes (MWCNTs)/turbine meter oil nanofluids on thermophysical attributes of lubricants, including the viscosity index, kinematics viscosity, flash point, pressure drop, and friction factor. The results indicated that the viscosity of pure lubricant was enhanced with the addition of MWCNTs and increased with decreasing temperature. The viscosity index at a concentration of 0.3 wt% was increased by 2.43%. The flash point temperature at concentrations of 0.3 wt% and 0.4 wt% was increased by 4.4%. Experiments were conducted to obtain the pressure drop data and friction factor. The friction factor increased for all concentrations of MWCNTs in pure oil; the highest increment in the friction factor, with the addition of 0.3 wt% nanoparticles to pure oil in 0.069 m/s inlet velocity, was 10.41%. The mean deviation between the experimental friction factor and simulation friction factor was 0.029. (C) 2020 Elsevier B.V. All rights reserved.