SIMULATION NUMERIQUE DU TRANSFERT
DE CHALEUR ET DE MASSE EN MILIEUX
FLUIDES ET POREUX

Abstract : In this thesis, heat and mass transfer by natural convection in confined fluid and porous
media has been studied numerically. Two of its parallel walls are maintained at constant
and different temperature and concentrations. The other two walls are impermeable and
well insulated. The thermosolutal convective phenomena inside the enclosure is described
by Navier-Stokes equations, the energy and species conservation equations. The porous
media is modeled according to the Darcy-Brinkman and Forchheimer model. The
convective flow is governed by the Rayleigh number (Ra), the buoyancy ratio (N), the
Prandtl number (Pr), the Lewis number (Le), the Darcy number and the porosity ε. The
control volume approach is employed to solve the governing equations. Concerning the
validation of the numerical algorithm, The results are found to be in excellent agreement
with those of previous work. The influence of the physical and geometrical parameters is
examined. Results shows that increasing of porous layer thickness reduces the global heat
and mass transfer for low values of permeability. The decrease in heat transfer with
increasing buoyancy ratio at high Lewis numbers is analyzed. Furthermore, in order to put
a the disposal of the engineer a tool allowing him to evaluate the thermal and solutal
transfer taking place in the considered type configuration, a correlations are proposed.
Document type :
Theses
Earth Sciences. Université des Sciences et de la Technologie Houari Boumediene, 2002. French


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Submitted on : Wednesday, May 23, 2007 - 8:48:04 PM
Last modification on : Friday, May 25, 2007 - 9:08:55 AM

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  • HAL Id : tel-00148969, version 1

Citation

Ramdane Younsi. SIMULATION NUMERIQUE DU TRANSFERT
DE CHALEUR ET DE MASSE EN MILIEUX
FLUIDES ET POREUX. Earth Sciences. Université des Sciences et de la Technologie Houari Boumediene, 2002. French. <tel-00148969>

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