فهرست مطالب majid gholami andarati

In this paper, we aim to investigate the dynamic viscosity of the Mg(OH)2-ethylene glycol(EG) nanofluid. The study is conducted in different solid volume fractions (0.1%, 0.2%, 0.4%, 0.8%, 1%, 1.5%, and 2%) at the temperatures of 23 and 55⁰C. It should also be mentioned that the average diameter of the nano-particle is 10nanometer. Moreover, the Newtonian behavior of the nanofluid is evidenced by examining the shear rate of the nanofluid. The results proof that while the solid volume fraction is increased, the dynamic viscosity is increased too. This increase is more noticeable at lower temperatures in comparison with higher temperatures.

In the present study, the thermal conductivity of Mg(OH)2-EG nanofluid has been experimentally investigated. All the experiments have been carried out at the temperatures ranging from 24 to 55 °C and different solid concentrations (0.1, 0.2, 0.4, 0.8, 1, 1.5, and 2%). The results declared that the variations of thermal conductivity of Mg(OH)2-EG nanofluid with respect to temperature at the solid volume fractions less than 0.4 %, compared to the higher solid volume fractions, is negligible. Furthermore, the maximum and minimum percentage of increasing the thermal conductivity at solid concentration of 2% is 22% at 55°C and 13% at 24°C, respectively.

In this study, the dynamic viscosity of Mg(OH)2-ethylene glycol(EG) is measured. Moreover, new model for determining the dynamic viscosity of the nanofluid is proposed. Due to the limitation of the previous correlations in order to predict the dynamic viscosity of the mentioned nanofluid, a new practical equation is suggested base on the experimental correlations. The results indicate that while the solid volume fraction is increased, the dynamic viscosity is increased simultaneously. It can be interesting to note that at lower temperatures, this increase is more noticeable than those in higher temperatures. In addition, it is shown that at the special temperature of 55⁰C, the solid volume fraction has no significant impact on the dynamic viscosity of the nanofluid. This unique consequence can be considered as a paramount breakthrough in the engineering and industrial applications.