Titre :
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An experimental study on natural convection from vertical surfaces embedded in porous media
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Auteurs :
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S. Rahman ;
M. Al-saleh ;
R. Sharma
|
Type de document :
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article/chapitre/communication
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Année de publication :
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2000
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Format :
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p. 214-218
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Langues:
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= Anglais
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Catégories :
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PHYSIQUE ETAT DE LA MATIERE
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Mots-clés:
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MILIEU POREUX
;
TRANSFERT DE MASSE
;
MILIEU NON SATURE
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Résumé :
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Mass-transfer coefficients for natural convection from vertical surfaces embedded in saturated porous media have been experimentally obtained by utilizing a limiting diffusion current technique based on cathodic reduction of cupric ions in an acidic solution. The data correspond to a high Rayleigh number and exhibit non-Darcian effects. Final results, when compared with available mathematical models, revealed that a model based on Prink-nan-extended Darcy's flow model with a corrected constant predicted mass-transfer coefficients closely. For the spherical packing materials the data fit well in, Sh(L)* = 3.32(Ra-L*/Da(L))(0.26), where Ra-L* and Da(L) are a modified Rayleigh number and Darcy's number, respectively.
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Source :
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Industrial & Engineering Chemistry Research, vol.39, n°1
|