Experimental study on viscosity of stabilized Al2O3, TiO2 nanofluids and their hybrid

Abstract This paper shows an experimental study on rheological behavior of hybrid nanofluids made of Al 2 O 3 –TiO 2 suspended in pure water. Also, simple nanofluid samples, with various volume fractions of Al 2 O 3 and TiO 2 were prepared and used for comparison. Viscosity measurements were achieved at room temperature and the shear rate between 10 and 1000 1/s for all samples. Experimental outcomes shown that all samples showed non-Newtonian behavior and followed the Ostwald model. Furthermore, the power law index and consistency index were discussed in detail. The curve-fitting technique was applied and results helped us tailoring few correlations in order to describe the rheological behavior. A regression analysis was also done in order to connect the relative viscosity with volume fractions of both nanofluids and hybrid nanofluid.