Theme: Thermal and Dynamic Study of Convection-Radiation Coupling in a Closed Enclosure

Sanembaye Adrien *

Renewable Thermal Energy Laboratory (LETTRE), Joseph KI-ZERBO University, Ouagadougou, Burkina Faso and University of Moundou, Moundou, Chad.

Konfé Amadou

Renewable Thermal Energy Laboratory (LETTRE), Joseph KI-ZERBO University, Ouagadougou, Burkina Faso and Joseph KI-ZERBO University, Ouagadougou, Burkina Faso.

Toussakoe Karim

Renewable Thermal Energy Laboratory (LETTRE), Joseph KI-ZERBO University, Ouagadougou, Burkina Faso.

KY Thierry Sikoudouin Maurice

Renewable Thermal Energy Laboratory (LETTRE), Joseph KI-ZERBO University, Ouagadougou, Burkina Faso and Joseph KI-ZERBO University, Ouagadougou, Burkina Faso.

Bathiebo Dieudonné Joseph

Renewable Thermal Energy Laboratory (LETTRE), Joseph KI-ZERBO University, Ouagadougou, Burkina Faso and Joseph KI-ZERBO University, Ouagadougou, Burkina Faso.

*Author to whom correspondence should be addressed.


Abstract

In this work, we present a two-dimensional study of natural convection in a square air-filled cavity whose two vertical sides are subjected to a temperature difference, while the other two horizontal ones are adiabatic. The numerical method used is that of finite elements used in the COMSOL calculation code. We first studied pure natural convection, by varying the Rayleigh number from  to , then its coupling with surface radiation, by varying the emissivity of the cavity surfaces from 0 to 0.6. The results are presented in the form of isotherms, pressure, current etc. It appears from this study that for a Rayleigh number less than 100, the fluid presents a vertical thermal stratification due to heat transfer only by conduction which does not generate any convective flow. The presence of surface radiation does not modify the equations governing fluid movements but only alternates the thermal boundary conditions. The coupling of natural convection and surface radiation occurs only through thermal boundary conditions. The variation in the emissivity of the walls does not influence the temperature isotherms.

Keywords: Natural convection, square cavity, convection-radiation coupling, numerical simulation


How to Cite

Adrien , Sanembaye, Konfé Amadou, Toussakoe Karim, KY Thierry Sikoudouin Maurice, and Bathiebo Dieudonné Joseph. 2023. “Theme: Thermal and Dynamic Study of Convection-Radiation Coupling in a Closed Enclosure”. Physical Science International Journal 27 (6):25-33. https://doi.org/10.9734/psij/2023/v27i6808.

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Author Biography

Konfé Amadou , Renewable Thermal Energy Laboratory (LETTRE), Joseph KI-ZERBO University, Ouagadougou, Burkina Faso and Joseph KI-ZERBO University, Ouagadougou, Burkina Faso.