Polytechnic University of Valencia Congress, 21st International Drying Symposium

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Fixed-bed drying of grains: analysis of the structural properties of packed-beds of non-spherical particles
Heitor O Nogueira Altino, Maria do Carmo Ferreira

Last modified: 26-12-2018

Abstract


Structural properties of packed-beds of non-spherical biological materials were investigated. The particles tested were oats, lentil, barley and soy, with sphericity ranging from 0.4 to 0.8. Porous alumina particles with sphericity of 0.98 were also included. The particles dimensions and sphericity were measured under moisture content ranging from the equilibrium up to 24% (dry basis). Mean voidage, bulk density, permeability and tortuosity of the packed-beds were obtained in the whole moisture range. The data were used as input into a correlation to predict Sherwood numbers under constant air velocity and the results were compared to evaluate the influence of packing characteristics on convective mass transfer.

Keywords: Sphericity; Permeability, Tortuosity, Fixed-Bed Dryers.


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