Abstract
In this experiment, for the first time, nanoparticles were suspended in the 5W30 base oil as a suitable oil for mild climates. Statistical investigation of the temperature effect, volume fraction (VF) and shear rate (SR) for viscosity of MWCNT–ZnO (20%–80%) / 5W30 nanofluid and a new experimental three variable correlation are presented for engineering applications with non-Newtonian fluids as their working fluids. In fact, the effect of SR on viscosity changes is considered for the first time for viscosity prediction of SAE 5W30 engine oil. Viscosity tests were carried out at temperatures between 5–55 °C to check the enriched oil behavior at low temperatures and 0.05%–1% VFs considering economic limitations. The addition of nanoparticles to the 5W30 base fluid at all temperatures increased viscosity. Moreover, the viscosity sensitivity less than 2% on VFs less than one, indicates that this nanofluid is suitable to use in various engineering systems. Low level of sensitivity of proposed nanofluid is a suitable condition for using this nanofluid in industries with a high level of risks of human mistakes.
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