Magnetohydrodynamic Free Convection Through Entropy Generation Scrutiny of Eco-Friendly Nanoliquid in a Divided L-Shaped Heat Exchanger with Lattice Boltzmann Method Simulation

Abstract

The current paper aims to investigate numerically the magnetized conjugate heat transport in a divided L-shaped heat exchanger (HE) filled with eco-nanofluid (functionalized graphene nanoplatelet (GnPs) dispersed in water) utilizing Lattice Boltzmann technique. Experimental correlations for thermo physical proprieties of the green nanofluid are utilized to study the flow pattern and conjugate heat transport inside the divided L-shaped HE. The entropy generation is also analyzed. Results are mainly presented using streamline, isotherms, entropy generation, Bejan number and average Nusselt number for various terms such as Ra numbers, Ha numbers and temperature. The obtained findings show that the heat transport enhances via increasing Ra number. The augmentation of magnetic field strength reduces the heat transport and the generated entropy. This behavior becomes remarkable for Ra= 105. Moreover, The Bejan number is kept constant for Ra=103 for all Ha number and increasing the Ra, the Bejan number increases with Ha. Besides, the increase in temperature rises the heat transport rate and reduces the entropy generation; nevertheless, the Bejan number is kept constant for all temperature values.