Contribution à l'étude des collisions entre particules et des interactions particules-parois en écoulement gaz-solide, par voie expérimentale et simulation lagrangienne

Abstract : The aim of the present work is to bring experimental and numerical contributions to the knowledge of the effects of collisions between particles in gas-solid flows. A Lagrangian simulation, using a probabiIistic model to take particIe-to-particle collisions into account is used. The first chapter consists in a review of previous works on these collisions and on particle-wall interactions in gas-solid suspension flows. The second chapter explains the development of an original experimental facility allowing the investigation of a gas-solid flow, in a vertical convergent channel, where effects of collisions between particIes are preponderant. Then, the third chapter describes the photographic technique of visualization and the image analysis method. Experimental results (Chapter IV) obtained for two mass flow rates of spherical glass beads (3mm in diameter) show the influence of collisions between particles on the evolution of the characteristics of the flow (velocity and concentration profiles). This experimental work is completed with measurements of particle-wall interactions characteristics (restitution and friction coefficients, roughness parameter) in our experiments. Next, the study of the influence of each parameter used to model particle-wall interactions and particle-to-particle collisions in the Lagrangian simulation is realized in chapter V. Finally, experimental resuIts are compared with predictions of this simulation (Chapter VI). The relevancy of using a probabilistic model to take collisions between particles into account is shown. An improvement of this model has been proposed. Nevertheless, it still needs to be improved. Departure from sphericity of the particles should also be modelled to get better predictions.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_1997_0261_FOHANNO.pdf
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https://hal.univ-lorraine.fr/tel-01747382
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Submitted on : Thursday, March 29, 2018 - 10:58:17 AM
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Stéphane Fohanno. Contribution à l'étude des collisions entre particules et des interactions particules-parois en écoulement gaz-solide, par voie expérimentale et simulation lagrangienne. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 1997. Français. ⟨NNT : 1997NAN10261⟩. ⟨tel-01747382⟩

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