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Surface radiation effects on turbulent Rayleigh-Benard convection in a parallelepipedic cavity

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1110
pages 531-534

Anne Sergent
UPMC, Université Pierre et Marie Curie, Paris 06, 4 place Jussieu, 75005 Paris, France; LIMSI, CNRS UPR 3251, Campus de l'université Paris-Sud, 91403 Orsay cedex, France

Shihe Xin
Univ Lyon, CNRS, INSA-Lyon, Universite Claude Bernard Lyon 1, CETHIL UMR5008, F-69621, Villeurbanne, France

Patrice Joubert
LASIE, CNRS UMR 7356, Universite de la Rochelle, 17026 La Rochelle cedex 01, France

Patrick Le Quere
LESTE UA CNRS 1098 Universite de Poitiers,40 av du Recteur Pineau,86022 Poitiers Cedex- France

Abstract

The influence of wall radiation on turbulent Rayleigh-Bénard convection in an air-filled parallelepipedic enclosure is studied numerically by comparing data obtained from 3D Direct Numerical Simulations (DNS) for convection-surface radiation coupling and 3D Large Eddy Simulations (LES) for pure convection. Simulations have been performed in an experimental configuration [1] at Rayleigh number Ra = 1.6·106. It has been shown that the surface radiation enhances the horizontal velocity accordingly to the experimental data. The asymmetrical influence of the radiation is observed on the convective or radiative Nusselt number, but the convective Nusselt number at wall is not modified by the radiation. The wall-radiation reduces the convective heat flux over half the cavity height due to the lateral radiative heat transfers, and particularly the turbulent convective heat flux.

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