An enhancement in thermal performance of partially ionized fluid due to hybrid nano-structures exposed to magnetic field

This article considers ethylene glycol as a partially ionized base fluid whose rheological characteristics can be exhibited by Carreau stress-strain relations. This dispersion of nanoparticles (MoS2) and hybrid nanoparticles (a combination of (MoS2 and SiO2) in ethylene-glycol is considered and thermal performance of MoS2-Carreau nanofluid and hybrid nanofluid (MoS2-SiO2-ethylene glycol) are investigated numerically using FEM. The results are validated. The present theoretical analysis has shown that thermal performance of working fluid can be enhanced by the use of hybrid nano fluid rather than nano fluid. Unfortunately, shear stress on elastic surface exerted by hybrid nanofluid is greater than the shear stress exerted by nanofluid. Although the thermal performance of hybrid nano fluid is greater than the thermal performance of nanofluid but one must be cautious about strength of surface as it can afford sufficient stress otherwise thermal system may experience failure. Failure analysis prediction while using hybrid nanonfluid must be in mind. As ethylene glycol is partially ionized and its interaction with applied magnetic field induces Hall and ion slip currents. Due to Hall and ion slip currents, ethylene glycol experiences Hall and ion slip forces which are opposite to the Lorentz force of applied magnetic field. This Lorentz force is reduced Hall and ion slip forces. Consequently, the flow of ethylene glycol is accelerated when Hall and ion slip parameters are increased. (C) 2019 Author(s).