Evaluation of the Free Volume Theory to Predict Moisture Transport and Quality Changes During Broccoli Drying
- 4 October 2011
- journal article
- research article
- Published by Taylor & Francis in Drying Technology
- Vol. 29 (16) , 1963-1971
Abstract
Moisture diffusion in porous broccoli florets and stalks is modeled using the free volume and Maxwell-Eucken theories. These theories are based on the mobility of water and concern the variation of the effective diffusion coefficient for a wide range of temperature and moisture content during product drying. Mass and heat transport, shrinkage, and vitamin C degradation during drying of broccoli are simulated by a spatial model. The effective diffusion coefficient varies strongly with product moisture content and temperature. Vitamin C degradation is high at moisture contents around 2 kg water/kg dry matter. The influence of the size of broccoli on the drying rate is evaluated for several types of broccoli florets and stalks.Keywords
This publication has 14 references indexed in Scilit:
- Desiccation Kinetics and Biothermodynamics of Glass Forming Trehalose Solutions in Thin FilmsAnnals of Biomedical Engineering, 2008
- Modified Free Volume Theory of Self-Diffusion and Molecular Theory of Shear Viscosity of Liquid Carbon DioxideThe Journal of Physical Chemistry B, 2005
- Modified Biot Number in the Context of Air Drying of Small Moist Porous ObjectsDrying Technology, 2005
- Inverse analysis of the transient bound water diffusion in woodHolzforschung, 2005
- Drying model for highly porous hemispherical bodiesEuropean Food Research and Technology, 1999
- Drying of shrinking cylinder-shaped bodiesJournal of Food Engineering, 1998
- Drying characteristics of hemispherical solidsJournal of Food Engineering, 1997
- Predicting ability of free-volume theory for solvent self-diffusion coefficients in rubbersJournal of Applied Polymer Science, 1996
- Predicting the Quality of Dehydrated Foods and Biopolymers — Research Needs and OpportunitiesDrying Technology, 1996
- Evaluation of a sorption equation for polymer–solvent systemsJournal of Applied Polymer Science, 1994