Impression of porous body and magnetic field on the double-diffusive mixed convection traits

Abstract

A numerical investigation is performed to exemplify the impression of a porous triangular body on the double-diffusive mixed convection traits in a cavity under the influence of magnetic field by employing lattice Boltzmann method. Al2O3−H2O nanofluid is considered as a working fluid, and the dynamically varying effective properties are measured through the Koo-Kleinstreuer-Li (KKL) model. The prime objective of the present analysis is to assess the repercussions of Richardson number (Ri = 0, 1, 5 & 10), Darcy number (10−4≤Da≤10−2), nanofluid volume fraction (Φ = 0% & 4%), and Hartmann number (Ha = 0, 25 & 50) on flow, heat and concentration transfer characteristics in and around the porous body with high temperature and concentration. Also, the variation of thermal and concentration mixings, and their uniformities are examined. It is noticed that the flow field intensity is amplified while increasing Da, Ri and Φ, and is reduced while augmenting Ha. Besides, the effect of Ha on the reduction of heat transfer to the enclosure walls is predominant at higher Da. The formation of thick thermal boundary layer along the slant edge of porous body due to the Ri and Da is significantly reduced while including nanoparticle in the base fluid. On contrary, increment in Φ dampens the concentration transfer traits. However, such adverse effect is efficiently controlled by Ri variation. It is found that the Ri enhancement assists Da to significantly augment concentration transfer. Furthermore, the thermal and concentration mixings are mainly governed by Da and Ri. In addition, the nanoparticle inclusion can alter the behaviour of permeability on concentration mixing and its uniformity.