Assessment of thermal performance of hybrid nanofluid flow in a tilted porous enclosure by imposing partial magnetic fields

Abstract

A novel approach of implementation of a partial active magnetic field in a slanting porous cavity packed with hybrid nanofluid has a significant influence on the various types of passive controlling of the transport phenomena. The magnetohydrodynamic (MHD) flow coupled with other multiphysics comes across widespread applications in health and medical science, electronics, others. Imposing magnetic field, treatment of tumor tissues is a promising technique, which needs an in-depth analysis of thermal performance. In this context, the present study explores a novel implementation of the partial magnetic field induced on a differentially heated inclined porous square enclosure containing Cu−Al2O3/water hybrid nanofluid. The partial magnetic field is imposed using varying effective width and the allocation impacts of this partial magnetic field on the inclined cavity have been investigated systematically. The width, as well as positional impacts of the applied partial magnetic fields, has been scrutinized thoroughly. The coupled transport equations are used for the solution by the finite volume technique (FVM) for a selective range of variables like Darcy-Rayleigh number (Ram), Hartmann number (Ha), Darcy number (Da), the concentration of hybrid nanofluid (ζ) and cavity angle (γ). The investigation exposes that the partial magnetic fields with cavity inclination have substantial effects on the heat transport mechanism. The study indicates that adjusting the position and width of the imposed magnetic fields, cavity angle, and involved pertinent parameters can significantly modulate the local as well as global transport phenomena under the multi-physical scenario. This technique allows less reduction in heat transfer, which is ∼15% (with partial magnetic field) and ∼30% (with whole domain magnetic field) relative to the no-magnetic field. Highlights The impact of a partially active magnetic field on thermal convection in a typical porous inclined cavity packed with a hybrid nanofluid is analyzed. The positional shifting and width of the spatially active magnetic field for the various parameters are illustrated using streamlines, isotherms, heatlines, and Nusselt numbers. The orientation of the enclosure under the partial magnetic fields significantly alters the overall thermal performance of the enclosure. The magnetic field intensity, porous structure permeability, volume concentrations of hybrid nanoparticles comprehensively persuade fluid and heat flow features. With this technique reduction in heat transfer is less, which is ∼ 15% (with partial magnetic field), and ∼ 30% (with whole domain magnetic field) relative to the no-magnetic field.