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Brazilian Journal of Chemical Engineering

versão impressa ISSN 0104-6632

Resumo

STAKIć, M.; BANJAC, M.  e  UROšEVIć, T.. Numerical study on hygroscopic material drying in packed bed. Braz. J. Chem. Eng. [online]. 2011, vol.28, n.2, pp.273-384. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322011000200012.

The paper addresses numerical simulation for the case of convective drying of hygroscopic material in a packed bed, analyzing agreement between the simulated and the corresponding experimental results. In the simulation model of unsteady simultaneous one-dimensional heat and mass transfer between gas phase and dried material, it is assumed that the gas-solid interface is at thermodynamic equilibrium, while the drying rate of the specific product is calculated by applying the concept of a "drying coefficient". Model validation was done on the basis of the experimental data obtained with potato cubes. The obtained drying kinetics, both experimental and numerical, show that higher gas (drying agent) velocities (flow-rates), as well as lower equivalent grain diameters, induce faster drying. This effect is more pronounced for deeper beds, because of the larger amount of wet material to be dried using the same drying agent capacity.

Palavras-chave : Heat and mass transfer; Mathematical model; Simulation.

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