The effect of Mg(OH)2 nanoparticles on the rheological behavior of base engine oil SN500 HVI and providing a predictive new correlation of nanofluid viscosity

Abstract

New engine lubricating oils based on nanotechnology have emerged with significant capabilities. In this study, the viscosity of SN 500 HVI/Mg(OH)2 lubricating nanofluid was recorded for analysis in solid volume fractions (SVF) of 0-1.5% with different shear rates (range of 650 to 13,250 s-1) at temperatures in the range of 5–60 °C. The Mg(OH)2 nanoparticles were modified with oleic acid. Nanoparticle functional groups were identified by Fourier transform infrared spectroscopy (FT-IR), morphology was examined by field emission scanning electron microscopes (FESEM), before and after modification. The prepared nanofluid was stable for up to 20 days at room temperature and no sediment was observed at rest. The non-Newtonian behavior for this nanofluid was proved in experiments of all samples with different SVFs. The rheological data of the new nano-lubricant stated that with the increase of Mg(OH)2 nanoparticles in the base oil, the viscosity increases and the increase of temperature has a negative effect. Based on the recorded SN 500 HVI/Mg(OH)2 nanofluid viscosity data (with changes in effective factors: temperature, shear rate and SVF), a surface response modeling was performed and a relation for viscosity prediction was presented with R2>0.99.

Keywords

• Base engine oil
• Nanoparticles
• Nano-lubricants
• Viscosity
• Experimental correlation