Heat performance resulting from combined effects of radiation and mixed convection in a rectangular cavity ventilated by injection or suction

Sustainable Buildings and Cities

土木建筑工程

Ezzaraa, K.^1 ; Bahlaoui, A.^1 ; Arroub, I.^1 ; Raji, A.^2 ; Hasnaoui, M.^3 ; Naïmi, M.^2

Sultan Moulay Slimane University, Polydisciplinary Faculty, Department of Physics, Team of Applied Physics and New Technologies (EPANT), B. P. 523, Béni-Mellal

23000, Morocco^1

Sultan Moulay Slimane University, Faculty of Sciences and Technologies, Department of Physics, Laboratory of Flows and Transfers Modelling (LAMET), B.P. 523, Béni-Mellal

23000, Morocco^2

Cadi Ayyad University, Faculty of Sciences Semlalia, Department of Physics, Laboratory of Fluid Mechanics and Energetics (LMFE), B.P. 2390, Marrakech, Morocco^3

关键词: Constant heat flux;    Heat performance;    Heat transfer rate;    Rectangular cavity;    Rectangular enclosures;    Temperature patterns;    Thermal structure;    Ventilation mode;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/353/1/012001/pdf
DOI  :  10.1088/1757-899X/353/1/012001

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In this work, we investigated numerically heat transfer by mixed convection coupled to thermal radiation in a vented rectangular enclosure uniformly heated from below with a constant heat flux. The fresh fluid is admitted into the cavity by injection or suction, by means of two openings located on the lower part of both right and left vertical sides. Another opening is placed on the middle of the top wall to ensure the ventilation. Air, a radiatively transparent medium, is considered to be the cooling fluid. The inner surfaces, in contact with the fluid, are assumed to be gray, diffuse emitters and reflectors of radiation with identical emissivities. The effects of some pertinent parameters such as the Reynolds number, 300 ≤ Re ≤ 5000, and the emissivity of the walls, 0 ≤ ≤ 0.85, on flow and temperature patterns as well as on the heat transfer rate within the enclosure are presented for the two ventilation modes (injection and suction). The results indicate that the flow and thermal structures are affected by the thermal radiation for the two modes of imposed flow. However, the suction mode is found to be more favorable to the heat transfer in comparison with the injection one.