Précipitation turbulente d'oxalate d'uranium en réacteur vortex : étude expérimentale et modélisation

Abstract : Industrial oxalic precipitation processed in an unbaffled magnetically stirred tank, the Vortex Reactor, has been studied with uranium simulating plutonium. Modelling precipitation requires a mixing model for the continuous liquid phase and the solution of population balance for the dispersed solid phase. Being chemical reaction influenced by the degree of mixing at molecular scale, that commercial CFD code does not resolve, a sub-grid scale model has been introduced : the finite mode probability density functions, and coupled with a model for the liquid energy spectrum. Evolution of the dispersed phase has been resolved by the quadrature method of moments, first used here with experimental nucleation and growth kinetics, and an aggregation kernel based on local shear rate. The promising abilities of this local approach, without any fitting constant, is strengthened by the similarity between experimental results and simulations.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2004_SOMMER_DE_GELICOURT_Y.pdf
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https://hal.univ-lorraine.fr/tel-01750071
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Submitted on : Thursday, March 29, 2018 - 12:37:06 PM
Last modification on : Thursday, January 31, 2019 - 1:27:49 AM

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Yann Sommer de Gélicourt. Précipitation turbulente d'oxalate d'uranium en réacteur vortex : étude expérimentale et modélisation. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL013N⟩. ⟨tel-01750071⟩

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