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Journal of Porous Media
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ISSN Imprimir: 1091-028X
ISSN En Línea: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v16.i2.70
pages 167-182

UNSTEADY DOUBLE-DIFFUSIVE NATURAL CONVECTION AND THERMAL RADIATION WITHIN A VERTICAL POROUS ENCLOSURE

Abdesslem Jbara
The National School of Engineers, University of Monastir, Ibn Aljazzar Street, 5019, Monastir, Tunisia
Hosni Souheil Harzallah
The National School of Engineers - University of Monastir, 5019, Tunisia
Khalifa Slimi
ISTLS
Abdallah Mhimid
Laboratory of Thermal and Energetic Systems Studies (LESTE) at the National School of Engineering of Monastir, 5019 Ibn Eljazzar Street, University of Monastir

SINOPSIS

Heat and mass transfer by double-diffusive natural convection and thermal radiation in a porous cavity opened at its top end, insulated at the bottom wall, and filled with a fluid-saturated porous medium has been numerically investigated. The porous medium, at local thermal equilibrium assumption, is considered as a fictitious homogeneous, isotropic, and participating medium that can emit, absorb, and scatter isotropically radiative energy. The side vertical walls of the enclosure are isothermal and gray. In this paper, a physical phenomena description has been presented and a sensitivity study of fluid flow and heat and mass transfer to different controlling radiative parameters, such as the particular emissivity ε, the optical thickness τD, the single scattering albedo ω, and the conduction−radiation parameter N, has been performed. The results indicate that the temperature and the axial velocity values are increased when ε and τD are increased or when ω and N are decreased. Moreover, the concentration values are decreased when ε and τD are increased or when ω and N are decreased.


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