Abstract
Laminar flow and heat transfer generated by natural convection, conduction, and radiation in a square cavity are studied. The cavity is divided into two domains (air and water) by a solid partition of finite thickness. Its vertical walls are maintained at two different temperatures varying linearly with height, while the horizontal walls are thermally insulated. Two cases, noted AW (air–water) and WA (water–air), are considered depending on whether the air is in contact with the hot or cold wall. The equations of conjugate natural convection and surface radiation (considered only in the air cavity) are solved using the finite volume and radiosity methods. This study analyzes the combined effects of the active wall temperatures, surface radiation, and the Rayleigh number. Simulation results reveal that thermal and hydrodynamic fields on both sides of the partition depend on the emissivity of the air cavity surfaces and the temperature profiles imposed on the active walls. Hence, the overall heat transfer through the enclosure depends on these parameters.
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