ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

# 多孔介质期刊

DOI: 10.1615/JPorMedia.v11.i7.20
pages 633-646

## Superheated Steam Drying of a Spherical Porous Particle

Jalila Sghaier
Département d'Energétique, Ecole Nationale d'Ingénieurs de Monastir, Avenue Ibn Eljazzar, 5019 Monastir, 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

In this article, we present a mathematical model to describe the drying kinetics occurring in a porous particle during superheated steam drying. This model is based on the averaging volume approach. It takes into account the effect of gradients of moisture content, temperature, and pressure. The heat flux by convection is given by the external transfer coefficient between the particle and the surrounding steam. The radiation exchange between the particle and the surrounding during the drying process in superheated steam vapor has been included. For the mass transfer, the natural physical condition at the drying surface is based on the equality of the partial pressure of the vapor and the external pressure of the stream. An iterative method is proposed to process this condition. The system of equations describing heat and mass transfer in a porous particle is solved numerically by the finite volume method with an irregular mesh. The predicted results from the model are compared with experimental data reported in the literature. The validated model is then used to investigate, parametrically the effects of system variables on the drying behavior of a porous particle in steam.

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