Abstract
In the present research, the rheological behavior of MWCNT (50%)-ZnO (50%)/5W50 nanofluid is investigated in the temperature range of 5–55 °C, different solid volume fractions (SVFs) between 0 and 1%, and shear rates (SRs) of 666.5–10,664 s−1. With the aim of preventing unwanted viscosity increase in nano-engine oil and according to test results, the SVF of 0.05% and 0.1% was selected as best choices for having an enriched engine oil containing nanoparticles with improved thermal conductivity and controlled viscosity behavior. Also, to check the sensitivity of nano-engine oil viscosity against unwanted changes in temperature and SVF, a sensitivity analysis was carried out on the produced nano-engine oil. Focusing on the results shows that the lowest sensitivity of viscosity occurs at lower temperatures and SVFs that are about 0.1% and 0.5% at a temperature of 5 °C and SVF of 0.05%, respectively. On the other hand, at higher temperatures and SVFs, the sensitivity of viscosity against temperature and SVF reaches its highest values that are about 1.2% at 55 °C and 6% at SVF of 1%. Based on results SVF of 0.05% is the most suitable enriched nano-engine oil with lowest viscosity influens level against dispersed nanoparticles and also with low level of sensitivity. Proposing a mathematical-based correlation is another achievement of the present study to predict the rheological behavior of nano-engine oil.
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