influences of temperature, concentration and shear rate on rheological behavior of nanofluid: an experimental study with al2o3-mwcnt/10w40 hybrid nano-lubricant

In this experimental study, the rheological behavior of al2o3-mwcnt (90%:10%)/10w40 hybrid nano-lubricant has been determined at the temperature range of 5°c to 55°c. al2o3 nanoparticles (average size of 50 nm) and mwcnts (inner and outer diameter of 2-6 nm and 5-20 nm, respectively) were dispersed in engine oil (10w40) to prepare 0.05%, 0.1%, 0.25%, 0.5%, 0.75% and 1% solid volume fractions. for each sample, dynamic viscosity was measured at shear rates ranging from 666.5 s^-1 to 13330 s^-1 with an uncertainty of about 0.6%. the findings insinuated that at the most range of temperature and solid volume fraction the nano-lubricant, as well as the base oil, are non-newtonian fluids. thus, by curve fitting the indexes of power law and consistency were calculated. eventually, the correlations indicated a very well compromise with experimental data