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Étude expérimentale et modélisation de mélangeurs convectifs : agitation de poudres de différentes coulabilités

Abstract : Mixing systems are usually difficult to understand, because there is a lack of knowledge concerning dynamic laws ruling these operations. Thus, nowadays, several tests are needed to predict properly the homogeneity of a powder mix. Throughout this PhD work, a method is developed to build predictive models for powder mixers and to bring out possible invariants for scale switching on these processes. Thus the stirring of powders is studied using different flow resistances within a 48L capacity Triaxe®, a convective planetary mixer. Rheological properties measurements are done at labscale (FT4 rheometer, volumenometer) for a better understanding of powder behavior at a wider mixer scale. A prototype blender has been built for this work. This polyvalent device, made of four blades and of a transparent vessel, allows to observe flow regimes and mechanisms, and to do rheological measurements. Two flow regimes have been identified (rolling, cataracting) and three flow mechanisms (convection, diffusion and avalanching). These mechanisms allowed to do stochastic modelling, for which parameters have been evaluated with experiments for free-flowing and cohesive powders.
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https://tel.archives-ouvertes.fr/tel-01673832
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Submitted on : Monday, January 1, 2018 - 1:43:52 AM
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  • HAL Id : tel-01673832, version 1

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Léonard Legoix. Étude expérimentale et modélisation de mélangeurs convectifs : agitation de poudres de différentes coulabilités. Génie des procédés. Ecole des Mines d'Albi-Carmaux, 2016. Français. ⟨NNT : 2016EMAC0020⟩. ⟨tel-01673832⟩

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