Article: Coupled natural convection and radiation in a cubic cavity filled with an air - H2O mixture in the presence of a heated obstacle Journal: Progress in Computational Fluid Dynamics, An International Journal (PCFD) 2022 Vol.22 No.3 pp.139 - 158 Abstract: Natural convection in a cubical cavity with a hot obstacle located on its floor is investigated. The inner fluid is a semi-transparent mixture of dry air and water vapour, which creates a coupled convective and radiative transport within the fluid. The conservation equations are solved by a finite volume method and the radiative transfer equation by using the discrete ordinates method. The radiative properties of the mixture are accounted for by a spectral line weighted sum of grey gases model associated to the rank correlated approach. It was observed that the volume radiation has a strong influence on the thermal and dynamic fields. The nearly vertical stratification of the temperature field around the plume is broken. Radiation also accelerates the boundary layers near the lateral surfaces and the ceiling and the floor of the enclosure. The total heat transfer is decreased due to both the reduction in convective process near the vertical walls and the attenuation by radiation. Inderscience Publishers - linking academia, business and industry through research

Title: Coupled natural convection and radiation in a cubic cavity filled with an air - H₂O mixture in the presence of a heated obstacle

Authors: Xuan Bach Nguyen; Didier Saury; Denis Lemonnier

Addresses: Institut PPRIME UPR CNRS 3346, CNRS ISAE-ENSMA, Université de Poitiers, ENSMA, Téléport 2, 1 Avenue Clément ADER, BP 40109, F-86961 Futuroscope Chasseneuil CEDEX, France ' Institut PPRIME UPR CNRS 3346, CNRS ISAE-ENSMA, Université de Poitiers, ENSMA, Téléport 2, 1 Avenue Clément ADER, BP 40109, F-86961 Futuroscope Chasseneuil CEDEX, France ' Institut PPRIME UPR CNRS 3346, CNRS ISAE-ENSMA, Université de Poitiers, ENSMA, Téléport 2, 1 Avenue Clément ADER, BP 40109, F-86961 Futuroscope Chasseneuil CEDEX, France

Abstract: Natural convection in a cubical cavity with a hot obstacle located on its floor is investigated. The inner fluid is a semi-transparent mixture of dry air and water vapour, which creates a coupled convective and radiative transport within the fluid. The conservation equations are solved by a finite volume method and the radiative transfer equation by using the discrete ordinates method. The radiative properties of the mixture are accounted for by a spectral line weighted sum of grey gases model associated to the rank correlated approach. It was observed that the volume radiation has a strong influence on the thermal and dynamic fields. The nearly vertical stratification of the temperature field around the plume is broken. Radiation also accelerates the boundary layers near the lateral surfaces and the ceiling and the floor of the enclosure. The total heat transfer is decreased due to both the reduction in convective process near the vertical walls and the attenuation by radiation.

Keywords: heat transfer; convection; radiation; numerical method.

DOI: 10.1504/PCFD.2022.123181

Progress in Computational Fluid Dynamics, An International Journal, 2022 Vol.22 No.3, pp.139 - 158

Received: 22 Mar 2020
Accepted: 20 Apr 2021
Published online: 01 Jun 2022 *

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Title: Coupled natural convection and radiation in a cubic cavity filled with an air - H2O mixture in the presence of a heated obstacle

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Title: Coupled natural convection and radiation in a cubic cavity filled with an air - H₂O mixture in the presence of a heated obstacle