Interest of modelling heat transfer inside a reactor to estimate kinetic parameters

Jimenez Nadiarid, Bohuon Philippe, Dornier Manuel, Bonazzi Catherine, Vaillant Fabrice. 2011. Interest of modelling heat transfer inside a reactor to estimate kinetic parameters. In : 11th International Congress on Engineering and Food, Athens, Greece, May 22-26, 2011. s.l. : s.n., Résumé, 5 p. International Congress on Engineering and Food. 11, Athènes, Grèce, 22 Mai 2011/26 Mai 2011.

Résumé : A space-and-time dependent model was developed for a reactor. The model, which combines heat transfer and chemical reaction, was intended to identify kinetic parameters under non-isothermal conditions for lowintermediate moisture foodstuff. In particular, the model was used to evaluate the effect of high temperature heat treatments (100-140 °C) on anthocyanins degradation in blackberry juice - quartz sand system at low water activity (aw 0.34). The coupled transport equations were solved using Comsol® calculation code. Kinetic and thermal parameters were identified with a nonlinear regression method. The relevance of this approach was assessed by comparison between the kinetic parameters estimated as described before (heterogeneous assumption) and the parameters identified by considering a homogeneous temperature distribution inside the reactor. The results showed no significant difference between the anthocyanins degradation reaction rate constant (k120°C) for the heterogeneous (3.29±0.05×10-3 s-1) and the homogeneous (3.5±0.3×10-3 s-1) assumption. And a slight difference was found between the activation energies (Ea) for the heterogeneous (95±5 kJ mol-1) and the homogeneous (108±7 kJ mol-1) identification. Therefore, the use of the developed model allowed a slight improvement in the identification of the kinetic parameters. However, the assumption of a heterogeneous distribution of temperature inside the reactor is valid for the identification of kinetic parameters with high orders of magnitude.

Classification Agris : U10 - Informatique, mathématiques et statistiques
Q02 - Traitement et conservation des produits alimentaires

Auteurs et affiliations

• Jimenez Nadiarid, UCR (CRI)
• Bohuon Philippe, CIRAD-PERSYST-UMR Qualisud (FRA)
• Dornier Manuel, CIRAD-PERSYST-UMR Qualisud (FRA)
• Bonazzi Catherine, AgroParisTech (FRA)
• Vaillant Fabrice, CIRAD-PERSYST-UMR Qualisud (CRI) ORCID: 0000-0001-6318-1353

Source : Cirad - Agritrop (https://agritrop.cirad.fr/568713/)

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