Modélisation et simulation des écoulements réactifs turbulents : validation et évaluation de la résolution de l'équation de transport de la fonction de densité de probalilité jointe de la composition (PDF) dans un réacteur de précipitation de type Taylor-Couette

Abstract : Numerical simulation of industrial reactor promises to be a precious tool that could help in prospecting new mixing technologies, in scaling-up and optimising reactors. Fast reactions, such as polymerisation and precipitations, are difficult to handle when mixing processes and reactions strongly interacts. This work aims at evaluating and validating reactive flow simulation for chemical engineering reactors using a special method which is able to take into account mixing reaction interaction for fast reactions. This method is based on solving Navier-Stokes equations in turbulent flow and then on solving the transport equation of the jointtcomposition Probability Density Function (PDF) with a Monte-Carlo solver. The validation is carried-out on a semi-batch Taylor-Couette precipitator. Each calculation step is validated. Finally, comparison between experiment and simulation proved that the method we chose has to be handle with special cares. Calculation has to be validated and 2 model constants have to be fitted and chemical kinetics known quite precisely. Besides, Monte-Carlo algorithm produces numerical noise which can highly affect reliability of the results. The calculation of the specific studied reactor didn'nt give completely good agreement with experiments. Nevertheless, the discrepancy is assigned not to the numerical approach but to the fact that the studied reactive flow is rather tricky to be calculated.
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Élise Fournier. Modélisation et simulation des écoulements réactifs turbulents : validation et évaluation de la résolution de l'équation de transport de la fonction de densité de probalilité jointe de la composition (PDF) dans un réacteur de précipitation de type Taylor-Couette. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 2002. Français. ⟨NNT : 2002INPL068N⟩. ⟨tel-01749724⟩

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