TY  - EJOU
AU  - Lahrech, Abdelhakim 
AU  - Tayebi, Tahar 
AU  - Kallel, Mohamed 
AU  - Hashemi-Tilehnoee, Mehdi 
AU  - Chamkha, Ali J. 

TI  - Magneto Thermosolutal-Aiding Free Convection in a Nanofluid-Filled-Non-Darcy Porous Annulus under Local Thermal Non-Equilibrium Approach
T2  - Computer Modeling in Engineering \& Sciences

PY  - 2025
VL  - 144
IS  - 1
SN  - 1526-1506

AB  - The study considers numerical findings regarding magneto-thermosolutal-aided natural convective flow of alumina/water-based nanofluid filled in a non-Darcian porous horizontal concentric annulus. Two equations are assumed to evaluate the thermal fields in the porous medium under Local Thermal Non-Equilibrium (LTNE) conditions, along with the Darcy-Brinkman-Forchheimer model for the flow. By imposing distinct and constant temperatures and concentrations on both internal and external cylinders, thermosolutal natural convection is induced in the annulus. We apply the finite volume method to solve the dimensionless governing equations numerically. The thermal conductivity and viscosity of the nanofluid mixture are determined utilizing Corcione’s empirical correlations, incorporating the effects of Brownian diffusion of nanoparticles. Steady-state findings are provided for a range of significant parameters, including buoyancy ratio (<i>N</i> = 1 to 5), Lewis (<i>Le</i> = 0 to 10), Rayleigh (<i>Ra</i> = 10<sup>2</sup> to 10<sup>5</sup>), Hartmann (<i>Ha</i> = 0 to 50), and heat generation in the nanofluid and solid phases (<i>Q</i> = 0 to 20) when the nanofluid flow is driven by aiding thermal and mass buoyancies at given porous medium characteristics (porosity (<i>ε</i>), Darcy number (<i>Da</i>), porous interfacial heat transfer coefficient (<i>H</i>), and thermal conductivity ratio (<i>γ</i>), to assess the thermosolutal convective circulation beside heat and solutal transfer rates in the annulus. The results reveal that internal heat generation significantly modifies the heat transport mechanism, initially reducing and then enhancing heat transfer rates as <i>Q</i> increases. Interestingly, increasing <i>Le</i> reduces heat transfer at low <i>Q</i> but promotes it when <i>Q</i> > 5, while mass transfer consistently increases with <i>Le</i>. The magnetic field represses heat transfer in the absence of internal heat but enhances it when internal heat is present.
KW  - Magnetized thermosolutal convection; porous interfacial heat transfer coefficient; porous annulus; LTNE; two-energy equations model; heat generating

DO  - 10.32604/cmes.2025.067099