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Journal of Porous Media
Impact-faktor: 1.49 5-jähriger Impact-Faktor: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v14.i2.50
pages 169-177

MATHEMATICAL MODELING OF A PACKED BED DRYING WITH HUMID AIR AND SUPERHEATED STEAM

Souad Messai
Laboratoire d'Energétique et des Transferts Thermiques et Massiques, Faculté des Sciences de Tunis, Campus Universitaire 1060, Tunis, Tunisie
Jalila Sghaier
Département d'Energétique, Ecole Nationale d'Ingénieurs de Monastir, Avenue Ibn Eljazzar, 5019 Monastir, Tunisie
Ali Belghith
Faculte des Sciences de Tunis, Laboratoire des Transferts de Chaleur et de Masse, Campus Universitaire, 1060 Tunis, Tunisia

ABSTRAKT

A one-dimensional mathematical model describing heat and mass transfer during the drying of a packed bed of porous particles with superheated steam and humid air has been developed. This model is based on the scale-changing approach. During superheated steam drying, the expression of mass flux is based on the resolution of the single-particle model: new correlations of different drying parameters are determined, whereas in the case of humid air drying the expression of mass flux is deduced from the literature. The numerical resolution of macroscopic equations describing heat and mass transfer during the drying of a packed bed is carried out by the finite-volume method. Experimental data for spherical porous alumina particles reported in the literature were used for the validation of the model. When comparing superheated steam and humid air drying processes, a temperature has been determined at which the drying rates during these two processes are equal. This temperature is called the inversion temperature. The latter is about 418 K for corn.