Transfert de chaleur en proche paroi en dispersion dans un milieu poreux granulaire. Application aux réacteurs en lits parcourus par un fluide gazeux

Abstract : Thermal control for chemical reactions conducted in fixed-bed reactors requires a fine knowledge about heat transfer in the near-wall region of the bed. In order to optimize the process design, to minimize the mass of catalyst that is needed, one must attempt to maintain the operational path of the reactor the closest of the isotherm functioning. A pertinent and reliable heat transfer model is then required. Two thesis were realized in the Laboratoire d'Energétique et de Mécanique Théorique et Appliquée in order to construct a corresponding dispersive model. This model can be used at the core of the reactor, where the porous medium can be homogenized. This thesis shows a wall effect that cannot be neglected. This wall effect is directly caused by the important variation of the porosity distribution near the wall of the bed. This work proposes a junction between a core layer, where the previous model is still valid, and the wall through an homogenized near-wall layer. This approach is validated by the mean of an experimental characterization of the model parameters, using an original inversion technique based on a Bayesian approach. A validation of this characterization in another geometry is also done. This geometry is closer to an industrial reactor
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Benoît Fiers. Transfert de chaleur en proche paroi en dispersion dans un milieu poreux granulaire. Application aux réacteurs en lits parcourus par un fluide gazeux. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL059N⟩. ⟨tel-01748729⟩

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