Coupled Natural Convection and Radiation in a Horizontal Rectangular Enclosure Discretely Heated from Below |
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| Authors: | A. Bahlaoui R. El Ayachi M. Hasnaoui M. Lamsaadi M. Naïmi |
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| Affiliation: | 1. Cadi Ayyad University, Faculty of Sciences and Technologies, Physics Department , UFR of Applied Chemistry and Environment Sciences, Team of Flows and Transfers Modeling (EMET) , Béni-Mellal, Morocco;2. Cadi Ayyad University, Faculty of Sciences Semlalia, Physics Department , UFR TMF, Laboratory of Fluid Mechanics and Energetics (LMFE) , Marrakech, Morocco |
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| Abstract: | A numerical study is carried out to investigate the interaction between natural convection and thermal radiation in a horizontal enclosure filled with air and heated discretely from below. The results are presented for a cavity having an aspect ratio A r = L′/H′ = 10, while the Rayleigh number and the emissivity of the walls are varied in the ranges 103 ≤ Ra ≤ 106 and 0 ≤ ε ≤ 1, respectively. The results of the study, presented in terms of flow and temperature patterns, average convective, radiative and total Nusselt numbers, evaluated on the cold wall, show that the problem has multiple solutions. Each of these solutions is characterized by a specific flow structure, and its appearance and range of existence depend strongly on the parameters Ra and ε. The amount of heat evacuated through the cold surface is dependent on the type of solution. |
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