Experimental investigation of thermo-physical properties of MgO-MWCNT (75-25%)/10W40 as a new nano-lubricant

In this study, the MWCNT-MgO (25-75%)/10W40 hybrid nano-lubricant was prepared via a two-step method and was experimentally investigated in the solid volume fraction (SVF) range of 0-1%, the temperature (T) range of 5-55 degrees C, and the shear rate (SR) range of 6665-11,997 s(-1). MWCNT and MgO nanoparticles (NPs) with a volume ratio of 25-75 were used to provide the NPs, and experiments were conducted at 6 Ts in the range of 5-55 degrees C. The results indicated that viscosity (VI) of nano-lubricant increases and decreases, respectively, with increasing SVF and temperature (T), in a way that the maximum VI drops (-5%) were observed at 15 and 25 degrees C, and at 0.05% SVF. Likewise, the highest VI increase (+26%) was observed at 45 degrees C and SVF of 1%. It was observed that the VI of the nano-lubricant at SVF of 1% and in the studied T range, with a mean of 16.13%, was higher than the VI of pure oil. The effect of NPs presence on VI was lower than that of the base fluid (BF) at lower Ts, as, at a T of 15 degrees C, the VI of this hybrid nano-lubricant increased by 20.3% and at 55 degrees C increased by 16%.

Automated summary

In this study, the MWCNT-MgO (25-75%)/10W40 hybrid nano-lubricant was prepared and experimentally investigated in different ranges of SVF, T, and SR. The results showed that the viscosity of the nano-lubricant varied with temperature and solid volume fraction, with significant changes observed at specific conditions.