Abstract
Contact drying of porous alumina beads (hygroscopic material) was studied at atmospheric pressure in an agitated laboratory disc dryer in order to have a better understanding of the heat and mass transfer phenomena occuring during the process. Drying kinetics and temperature profiles were determined as a function of operating parameters, namely, the initial moisture content, the plate temperature and the agitation frequency. These data (drying kinetics, temperature profile) were modelled using a contact drying model adapted to this hygroscopic material. The experimental data which are a function of two main parameters, namely, the plate temperature and the stirrer rotation speed, were in good agreement with the model prediction.
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