An Empirical Investigation on the Dynamic Viscosity of Mg(OH)2- Ethylene Glycol in Different Solid Concentrations and Proposing New Correlation Based on Experimental Data

Abstract

In the present study, the dynamic viscosity of the Mg(OH)2-ethylene glycol(EG) nanofluid is investigated. The studied nanofluid in
different solid volume fractions of 0.1%, 0.2%, 0.4%, 0.8%, 1%, 1.5% and 2% at the temperatures of 23 and 55⁰C with diameter particle size
of 10 nanometer are measured. In addition, by investigating the shear rate of the nanofluid at various sizes and measuring the dynamic
viscosity of the nanofluid, the Newtonian behavior of this nanofluid is proofed. Regarding the weakness of the previous correlations for
predicting the dynamic viscosity of this nanofluid and according to the experimental correlations, a new equation is proposed. The results
show that by increasing the solid volume fraction, the dynamic viscosity is increased. This increase is by far more at lower temperatures
compared with higher temperatures. Also, at the temperature of 55⁰C, the solid volume fraction has no great effect on the dynamic viscosity
of the nanofluid which this issue can be take into account as an important achievement in the industrial and engineering applications.