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Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 56, 2009 - Issue 2
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Original Articles

Computer Simulation of Atmospheric Freeze Drying of Carrot Slices in a Fluidized Bed

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Pages 170-191 | Received 03 Nov 2008, Accepted 05 Jun 2009, Published online: 22 Jul 2009
 

Abstract

Nam and Song's model, which describes the first stage of vacuum freeze drying, is adapted to atmospheric pressure conditions in a pulsating fluidized bed, discretizing the differential equations by finite-difference according to the implicit scheme. The generated algebraic systems of equations are solved by the tridiagonal matrix algorithm (TDMA). The effect of the variable time step on computation time is analyzed. The effect of particle size reduction, bed temperature increase, and the incorporation of infrared radiation made it possible to reduce drying times. Comparison with experimental values of the first stage of the freeze drying of carrot slices and the values calculated from the model showed a maximum mean quadratic error of 0.09.

The authors are grateful for the financial support under FONDECYT project no.1070019.

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