The evaluation on a new non-Newtonian hybrid mixture composed of TiO2/ZnO/EG to present a statistical approach of power law for its rheological and thermal properties

摘要

In this study, the rheological behavior of TiO2/ZnO/EG nanofluid at temperature range of 25 degrees C to 50 degrees C has been experimentally investigated. The steady and homogeneous suspensions, in volume fractions of 0.1% to 1.5%, have been prepared with volume composition of 50% ZnO nanoparticles and 50% TiO2 nanoparticles in a specified amount of EG. The viscosities of sample nanofluid have been measured in different shear rates of 6.12 S-1 to 61.2 S-1. The results of viscosity measurement showed that, TiO2/ZnO/EG nanofluid has Newtonian behavior in volume fractions of 0.1%, 0.3% and 0.5% and in all of the considered temperatures and by increasing volume fraction of nanoparticles, the viscosity of nanofluid enhances and also, by increasing the temperature, nanofluid viscosity reduces. While, the sample nanofluid in volume fractions of 1% and 1.5% have non-Newtonian behavior similar with power law model with power coefficient less than 1. For nanofluid samples in 1% and 1.5% volume fractions in all considered temperatures, the power law model coefficients have been calculated by curve-fitting with high accuracy The results indicated that, in general, by increasing volume fraction, the apparent viscosity enhances and by increasing the temperature, the apparent viscosity reduces. (C) 2018 Elsevier B.V. All rights reserved.