Non fourier heat transfer enhancement in power law fluid with mono and hybrid nanoparticles

Abstract

Several polymers like ethylene glycol exhibit non-Newtonian rheological behavior. Ethylene glycol is a world-widely used engine coolant and therefore, investigation of thermal enhancement by dispersing mono and hybrid nanoparticles in ethylene glycol is worthful. Since ethylene glycol has shear rate-dependent viscosity and it obeys the power-law rheological model. Therefore, based on these facts, the power-law rheological model with thermophysical properties is augmented with basic law of heat transfer in fluid for the modeling of the considered physical situation. MoS2 are taken as mono-nanoparticles where MoS2 and SiO2 are taken as hybrid nanoparticles. Comparative study for the enhancement of thermal performance of MoS2 ethylene glycol and MoS2−SiO2– ethylene glycol is done. For energy conservation, non-Fourier’s law of Cattaneo–Christov is used. The power-law fluid becomes more heat generative due to the dispersion of MoS2 and SiO2. However, MoS2−power-law fluid is less heat generative relative to MoS2− SiO2-nanofluid. Thermal relaxation time is found proportional to the ability of the fluid to restore its thermal equilibrium.