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Modelling and Simulation of a Vibrofluidised Bed Dryer for Solids containing Solvent Mixtures
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. (Drying)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. (Drying)
2007 (Spanish)In: Nexo, ISSN 1818-6742, Vol. 20, no 2, 56-68 p.Article in journal (Refereed) Published
Abstract [en]

The drying of solids in a continuously worked vibrated fluidised bed dryer is studied by simulations. A model considering the drying of a thin layer of particles wetted with a multicomponent mixture is developed. Particles are assumed well mixed in the direction of the airflow and only the longitudinal changes of liquid content, liquid composition and particle temperature are considered. Interactive diffusion and heat conduction are considered the main mechanisms for mass and heat transfer within the particles. Assuming a constant matrix of effective diffusion coefficients analytical solutions of the diffusion and conduction equations are obtained. The variation of both the diffusion coefficients and the effective thermal conductivity of the particles along the dryer is taken into account by a stepwise application of the analytical solution in space intervals with averaged coefficients from previous locations in the dryer. The analytical solution represents a suitable method to study the selectivity and aroma retention during drying of foodstuffs. The solution is computationally fast; therefore, the experimental verification of this approximate model would be very useful since the rigorous treatment of multicomponent drying involves tedious and time-consuming calculations.

Place, publisher, year, edition, pages
Managua, Nicaragua: National University of Engineering (UNI) , 2007. Vol. 20, no 2, 56-68 p.
Keyword [en]
Aroma retention; Drying selectivity; Multicomponent drying
National Category
Chemical Engineering
URN: urn:nbn:se:kth:diva-85776OAI: diva2:500124
QC 20120305Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-03-05Bibliographically approved

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