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Titre :
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Natural convection due to heat and mass transfer in a composite system
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Auteurs :
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A. Singh ;
T. Paul ;
G. Thorpe
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Type de document :
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article/chapitre/communication
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Année de publication :
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1999
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Format :
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p. 39-48
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Langues:
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= Anglais
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Catégories :
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THERMIQUE THERMODYNAMIQUE
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Mots-clés:
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TRANSFERT DE CHALEUR
;
TRANSFERT DE MASSE
;
MILIEU POREUX
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Résumé :
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A numerical study is performed to analyse heat and mass transfer phenomena due to natural convection in a composite cavity containing a fluid layer overlying a porous layer saturated with the same fluid. The flow in the porous region is modelled using Brinkman-Forchheimer-extended Darcy model that includes both the effect of macroscopic shear (Brinkman effect) and flow inertia (Forchheimer effect). The vertical walls of the two-dimensional enclosure are isothermal whilst the horizontal walls are adiabatic. The two regions are coupled by equating the velocity and stress components at the interface. The resulting coupled equations in non-dimensional form are solved by an alternating direction implicit method by transforming them into parabolic form by the addition of false transient terms. The numerical results show that the amount of fluid penetration into the porous layer depends strongly upon the Darcy, thermal and solutal Rayleigh numbers. Average Nusselt number decreases while average Sherwood number increases with an increase of the Lewis number. The transfer of heat and mass on the heated wall near the interface depends strongly on the Darcy number.
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Source :
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Heat and Mass Transfer, vol.35, n°1
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