Rheological behavior of 10W40 base oil containing different combinations of MWCNT-Al2O3 nanoparticles and determination of the target nano-lubricant for industrial applications

The main goal of this research is to compare the rheological behavior of hybrid nano lubricants (HNLs) with different composition ratios in a base oil. The purpose of the comparison is to determine the HNL with the best lubrication performance at the start of the vehicle. Theoretical methods have confirmed the non-Newtonian behavior in different laboratory conditions. HNLs with the composition ratio of 30:70 and 25:75 had the highest percentage of increase and decrease in viscosity, respectively 34.97% and − 1.85% at T = 55 °C, shear rate SR = 6665 s −1 and solid volume fraction SVF = 1% and T = 5 °C, SR = 3999 s −1 and SVF = 0.05%. To predict the viscosity of the desired HNL, in the RSM, a special model with an accuracy of R 2 = 0.9997 has been used. The margin of deviation (MOD) is determined in the range of − 3.43%