A novel comparative experimental study on rheological behavior of mono & hybrid nanofluids concerned graphene and silica nano-powders: Characterization, stability and viscosity measurements

By I. Kazemi, M. Sefid, Masoud Afrand. 2020

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ABSTRACT This paper explores a hybrid- and two mono-nanofluids and, to be more specific, it deals with the effect of adding Silica (SiO2) and Graphene (G) nanoparticles and their hybrid (G (30%) + SiO2 (70%)) on viscosity of water. For all designed hybrid- and mono-nanofluids at various concentrations of 0.05–1%, viscosity was measured under the influence of temperature (25–50 °C). Meanwhile, for measuring the viscosity, different shear rates (12.23–122.3 s−1) have been applied to evaluate rheological behavior of nanofluids. The viscosity of hybrid nanofluids lies between the viscosity of mono nanofluids, while G/Water mono-nanofluid samples have the highest value. Experimental results revealed non-Newtonian pseudoplastic behavior for all three types of nanofluids, this behavior is more evident in the G/Water mono-nanofluid. Moreover, G-SiO2(30–70%)/Water hybrid nanofluid has a higher tendency to the behavior of SiO2/Water mono-nanofluid. Finally, via curve fitting method, two-variable correlations were proposed to estimate rheological behavior of G-SiO2(30–70%)/Water hybrid nanofluid.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Fluid Flow and Transfer Processes

View Paper: https://www.semanticscholar.org/paper/9b3e448d2553cb0b6b1b5e995f3463a408854c15