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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v12.i7.30
pages 639-656

Modeling Heat and Mass Transfer during Superheated Steam Drying of a Fixed Bed of Porous Particles

Jalila Sghaier
Département d'Energétique, Ecole Nationale d'Ingénieurs de Monastir, Avenue Ibn Eljazzar, 5019 Monastir, Tunisie
Souad Messai
Laboratoire d'Energétique et des Transferts Thermiques et Massiques, Faculté des Sciences de Tunis, Campus Universitaire 1060, Tunis, Tunisie
Wahbi Jomaa
Laboratoire TREFLE-UMR 8508, Site ENSAM, Esplanade des Arts et Métiers, 33405 Talence Cedex, France
Ali Belghith
Faculte des Sciences de Tunis, Laboratoire des Transferts de Chaleur et de Masse, Campus Universitaire, 1060 Tunis, Tunisia

ABSTRACT

Heat and mass transfer during drying of a fixed bed of wet porous particles in superheated steam is modeled. The mathematical model is based on the averaging approach using two changes of scale. Convective heat transfer is assumed between the granular bed and steam. To take into account the thermal nonequilibrium between the porous particle and fluid phase, a two-temperature macroscopic model is used to describe heat transfer. The mass transfer is introduced in the form of drying kinetics deduced from a single-particle model describing superheated steam drying. This model was developed in a previous paper. In this work, correlations of mass flux deduced from the single-particle model are presented and incorporated in the fixed-bed model. The set of partial equations describing the steam drying of a fixed bed is solved using the finite volume method, which was achieved by the computer program written in FORTRAN language. To validate this model, the predicted results are compared with the experimental results from the literature and good agreement was obtained.