Abstract
In the current study, an experimental study was carried out on the rheological properties of hybrid non-Newtonian nanofluid (MWCNTs–ZnO/Water–Ethylene glycol (80:20vol.%)) to develop a new model. The viscosities of nanofluid were evaluated in the temperature range of 25–50°C with volume fractions of φ=0.075%, 0.15%, 0.3%, 0.6%, 0.9%, and 1.2%. We find that the effect of changes is more obvious when the φ is increased. So the property of non-Newtonian nanofluid is more likely to appear. In addition to a temperature of 25°C, the viscosity increase from a φ=0% to 1.2% is higher than 90%, which is very significant. Also, in the maximum φ, at T=50°C, 40°C and 30°C, the viscosity reduction is 21%, 17%, and 8%, respectively, relative to the reference temperature (25°C). The above results can be of great help to engineers in designing thermal systems to increase heat transfer and considering pumping power.
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