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Theses

Traitements micro-ondes et transferts de chaleur en milieu multiphasique

Abstract : Microwave technology is a process which knows many applications within food process industry. However this process is still badly known because of complex interactions between the microwaves and the matter. Within the framework of this numerical and experimental thesis, the study focuses on the microwave thawing process of a model product, the tylose gel. The heat generation due to microwaves is modelled by using the numerical resolution of the Maxwell's equations via a finite element method. The simulated temperatures are compared with experimental measurements and semi analytical solutions available in the literature. First of all, the frozen phase (low dielectric) and the defrosted phase (high dielectric) are studied separately. The results highlight the resonance phenomena with variable locations of the hot spots within the frozen product. The influence of the dielectric properties is also highlighted by using a reverse technique intended for their estimation. In the defrosted phase, the numerical and semi analytical solutions are in good agreement with the experimental data. The study is then extended to the microwave thawing process. The model sensitivity is characterised with the temperature dependent dielectric properties during the phase transition. Lastly, several recommendations are proposed for predictive control of temperature profiles during the microwave heating process.
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Contributor : Sebastien Curet <>
Submitted on : Monday, April 27, 2020 - 11:38:54 AM
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  • HAL Id : tel-02555365, version 1

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Sébastien Curet. Traitements micro-ondes et transferts de chaleur en milieu multiphasique. Génie des procédés. Université de Nantes, 2008. Français. ⟨tel-02555365⟩

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