Implementation of partial magnetic fields to magneto-thermal convective systems operated using hybrid-nanoliquid and porous media

Application of partial magnetic field can be useful for controlling thermal convective processes occurring in magneto-thermal devices/systems. The present work aims to demonstrate the implementation of a partial magnetic field using a typical thermal system. This study explores both local transport phenomena and global heat transfer rates. The partial magnetic fields involving multiphysical conditions find many applications in electronic industries, medical, and health science. The paper presents a conceptual finding from the use of a partial magnetic field on a classical porous cavity comprising Cu-Al2O3/water hybrid nanoliquid heated differentially. The partial magnetic field is functional either horizontally or vertically. The finite volume technique is employed to the coupled transport equations subjected to particular boundary situations using a developed computing code. The simulations are accomplished to a great extent with different variables such as the Darcy-Rayleigh number (Ra-m), Darcy number (Da), Hartmann number (Ha), and hybrid nanoparticles concentrations (phi). The effects of magnetic field widths and their positional variations in horizontal and vertical directions are also analyzed. The study found that the convective transport process could effectively be modulated by setting the appropriate position, widths, directions, and intensity of the imposed magnetic fields. The partial magnetic field causes a decrease in heat transfer similar to 17.15% or 9.71% less compared to the whole length horizontal or vertical magnetic field. The application of partial magnetic fields significantly alters local thermo-fluid flow phenomena and advancement in heat transfer characteristics in comparison to the magnetic fields acting over the entire domain. Furthermore, the heatline visualization tools reveal the insight of the heat flow dynamics, which dictates the selection of appropriate parametric values and magnetic field configurations.