Experimental investigation of thermo-physical properties of MgO-MWCNT (75–25%)/10W40 as a new nano-lubricant
Department of Mechanical Engineering, Imam Hossein University, Tehran, Iran
2 Department of Energy, Water, Energy and Environment Center, Tehran, Iran
Accepted: 9 April 2021
Published online: 31 May 2021
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 °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 °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 °C, and at 0.05% SVF. Likewise, the highest VI increase (+ 26%) was observed at 45 °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 °C, the VI of this hybrid nano-lubricant increased by 20.3% and at 55 °C increased by 16%.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021