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Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383

Abstract

ASSIS, A. J.; LIRA, T. S.; MURATA, V. V.  and  BARROZO, M. A. S.. Concurrent drying of soybean seeds: the effect of the radial air profile. Braz. J. Chem. Eng. [online]. 2005, vol.22, n.2, pp.311-318. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322005000200020.

The aim of this work was to analyze the heat and mass transfer between the air and soybean seeds in a concurrent moving bed dryer with an air profile that is not flat. The modelling of heat and mass transfer in moving bed dryers is generally based on the application of mass and energy balance equations for both solid and fluid phases (two-phase model). In the establishment of these equations some classical hypotheses such as that the fluid velocity profile is flat, are assumed. The main goal of this work was to verify the validity of this assumption by means of an experimental and simulation study in a concurrent moving bed, using soybean seeds as particles. In this work, the radial air profile was taken into account by means of a suitable empirical correlation and a mechanistic model validated by experimental results. The numerical solution of the one-dimension boundary value problem was obtained by means of a computational code based on axial integration through the DASSL code. By comparison of the experimental data and the simulated responses for air temperature and seed moisture content, it was possible to verify the significant effect of air velocity distribution.

Keywords : Concurrent drying; Soybean seeds; Radial air profile.

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