Moisture diffusion in gelatin slabs by modeling drying kinetics
1997
Bonazzi, Catherine, C. | Ripoche, Aude | Michon, Camille | Génie industriel alimentaire (GENIAL) ; Institut National de la Recherche Agronomique (INRA)-Conservatoire National des Arts et Métiers [Cnam] (Cnam)-Institut National Agronomique Paris-Grignon (INA P-G)-Ecole Nationale Supérieure des Industries Agricoles et alimentaires | Ecole Nationale Supérieure des Industries Agricoles et alimentaires
Conference: 10th International Drying Symposium (IDS 96) Location: KRAKOW, POLAND Date: JUL 30-AUG 02, 1996
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Afficher plus [+] Moins [-]anglais. The aim of this work is to improve the knowledge concerning moisture mobility in gelatin slabs, through the evaluation of moisture diffusivity (function of temperature and moisture content) by modeling of drying kinetics. The first part of this work is devoted to the determination of the gel characteristics needed for a good modeling. Drying experiments were then carried out on a pilot drier according to a central composite design with 3 factors (temperature, moisture content and pH). Moisture diffusivity was finally calculated by fitting a model to the drying experiments. The chosen model (a conventional diffusive model with variable diffusion coefficient, solved by finite difference calculations in a solid-related frame of coordinates) did not perfectly fit the experimental results. It especially under-estimates moisture gradients at the surface of the gel.
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