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Simulation eulérienne-lagrangienne d'écoulements gaz-solide non isothermes : interactions particules-turbulence, application aux écoulements en conduite

Abstract : The aim of this work is to contribute to the numerical modeling of turbulent gas-solid flows in vertical or horizontal non isothermal pipes, which can be found in many industrial processes (pneumatic transport, drying, ...). The model is based on an Eulerian-Lagrangian approach allowing a fine description of the interactions between the two phases (action of the fluid upon the particles (dispersion), action of the particles upon the fluid (two way coupling) and between particles (collisions)), more or less influential according to the characteristics of the flow. The influence of the gas phase turbulence on the particle motion is taken into account using a non-isotropic dispersion model, which allows the generation of velocity and temperature fluctuations of the fluid seen by the particles. The numerical developments brought to the model for vertical and horizontal pipe flow have been validated by comparison with available experimental results from the literature. The sensitivity tests highlight the influence of the dispersion model, collisions and turbulence modulation (direct and non direct modifications ) on the dynamic and thermal behavior of the suspension. The model is able to predict the heat exchanges in the presence of particles for a wide range of flows in vertical and horizontal pipes. However numerical problems still exist in two-way coupling for very small particles and loading ratios above one. This is related to the problems encountered when modeling the coupling terms between the two phases (parameters Ce2 and Ce3 ) involved in the turbulence dissipation balance.
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https://tel.archives-ouvertes.fr/tel-00007697
Contributor : Valérie Chagras <>
Submitted on : Thursday, December 9, 2004 - 2:09:19 PM
Last modification on : Monday, March 29, 2021 - 4:02:38 PM
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Valérie Chagras. Simulation eulérienne-lagrangienne d'écoulements gaz-solide non isothermes : interactions particules-turbulence, application aux écoulements en conduite. Energie électrique. Université Henri Poincaré - Nancy I, 2004. Français. ⟨tel-00007697⟩

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