Statistical investigation for developing a new model for rheological behavior of Silica-ethylene glycol/Water hybrid Newtonian nanofluid using experimental data

In this experimental investigation, we developed a new model for rheological behavior of Silica-Ethylene glycol/Water (30: 70 vol. %) hybrid Newtonian nanofluid. The tests were carried out in volume fractions of 0.1%, 0.25%, 0.5%, 0.75%, and 1.5%, the temperature range from 25 degrees C to 50 degrees C, and in the shear rate range 24.48 s(-1) to 73.44 s(-1). It can be deduced that the obtained correlation is a suitable model for estimating the desired nanofluid viscosity. Also, as the volume fraction increases, the relative viscosity increases due to the greater dispersion of the nanoparticles in the base fluid. The maximum marginal deviation values in this graph are shown to be equal to 1.37%. This value is acceptable for an experimental correlation. We find that the relationship between shear stress and shear rate is linear; then the desired fluid is Newtonian. At the maximum volume fraction, the percentage of loss of viscosity from the minimum temperature to the maximum temperature is 89%. In addition, at maximum operating temperature, the percentage increase in relative viscosity in the maximum volume fraction relative to the minimum fraction is 48%. (C) 2019 Elsevier B.V. All rights reserved.