Titre :
|
Air drying of vegetables: Evaluation of mass transfer coefficient
|
Auteurs :
|
M. Markowski
|
Type de document :
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article/chapitre/communication
|
Année de publication :
|
1997
|
Format :
|
p. 55-62
|
Langues:
|
= Anglais
|
Catégories :
|
TECHNOLOGIE ALIMENTAIRE
|
Mots-clés:
|
LEGUME RACINE
;
SECHAGE
;
TRANSFERT DE MASSE
;
METHODE DES ELEMENTS FINIS
;
MODELISATION
;
CAROTTE
|
Résumé :
|
A new equation for the external mass transfer coefficient during vegetable drying is presented. The equation is validated for carrot slices dried under natural convection conditions. A finite element method is used to solve the non-linear boundary value problem modelling the carrot drying process. The mean value of the mass transfer coefficient is 1.371 x 10(-7) ms(-1) during the initial phase of ms drying 4-mm-thick fresh carrot slices in air at 60 degrees C. It is concluded that the Neuman-type boundary condition for mass transfer during carrot drying gives a much better fitting of measured results to the computer simulation results than does the Dirichlet-type one. The Dirichlet-type boundary condition used for simulation of the process of carrot drying under natural convection conditions may lead to unrealistic results.
|
Source :
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Journal of Food Engineering, vol.34
|