Discrete Heating and Outlet Ports’ Influences on Thermal Convection in Lid-Driven Vented Cavity System with Thermal Dispersion and LTNE Effects

An ambit of enhancing heat transfer throughout thermal convection in a cavity is explored numerically in this study, contemplating the heat dispersal from a segmental heat source circumscribed in a square-vented porous cavity with a moving lid. The cavity can be used as a heat sink for electronic cooling, material processing, and convective drying. Aluminum 10 PPI metal foam saturated by aluminum oxide–water nanofluid is occupied in this lid-driven vented cavity system. The bottom cavity wall is fully and partially heated by a heat source of specific length LH, and the left wall and inlet fluid are kept at the same cold temperature, while the right wall and top-driven wall are thermally insulated. Thermal dispersion and local thermal non-equilibrium effects are included in an energy equation, and continuity and Darcy–Brinkmann–Forchheimer momentum equations are implemented and resolved by utilizing the finite volume method with the aid of a vorticity–stream function approach operation. The inspirations behind pertinent parameters, including the Reynolds number (Re=10–50), Grashof number (Gr=103–106), inlet and outlet ports’ aspect ratio (D/H=0.1–0.4), outlet port location ratio (S/H=0.25–0.75), and discrete partial heating ratio (LH/L=0.25–1) are scrutinized. The baseline circumstance corresponds to full-length heating LH/L=1 and the outlet port location ratio S/H=0.25. The results reveal that the fluid and heat flow domains are addressed mostly via these specification alterations. For Gr=103, increasing Re from 10 to 40 does not alter streamlines or the isotherm field, but when Re=50 it is detected that streamlines increase monotonically. Streamlines are not altered when LH/L and S/H are amplified but strengthened more when the opening vent aspect ratio is increased. A greater temperature difference occurs as LH/L is raised from 0.25–0.75 and isotherms are intensified, and the thermal boundary layer becomes more distinct when S/H is augmented. The average Nusselt number rises as Re, Gr, LH/L, and D/H are increased by about 30%, 3.5%, 23%, and 19.4%, respectively, and it decreases with S/H amplifying is increased by around 5.5%.