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Heat and mass transfer model for potato drying

✍ Scribed by S. Simal; C. Rossello; A. Berna; A. Mulet

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
628 KB
Volume
49
Category
Article
ISSN
0009-2509

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✦ Synopsis

A model describing the mass and heat transfer during hot air drying of potato cubes was evaluated. A moving boundary problem as well as a local temperature-dependent effective diffusivity was considered. Temperature calculation within the sample was pexformed using the macroscopic heat transfer balance. The moving boundary problem was solved by an explicit finite difference method using experimental time and moisture data of an experiment carried out at 90Β°C by identification on the model describing the heat and mass transfer. The effective diffusivity was derived according to Arrhenius' law.

For evaluation purposes this model was applied to drying experiments in a range of air temperatures between 30Β°C and WC and cube sizes between 8 and 15 cm. The model permits a good process description allowing us to explain more than 99.3% of the total variance.

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## Abstract The article presents a mathematical model of drying that describes the kinetics of combined microwave‐convective drying for the process as a whole. Based on this model, the drying curves and the temperature evolutions of the drying body were constructed by a number of computer‐simulated