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Comparison of various micromixing approaches for computational fluid dynamics simulation of barium sulfate precipitation in tubular reactors / Alper A. Öncül in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 999–1007 Titre : Comparison of various micromixing approaches for computational fluid dynamics simulation of barium sulfate precipitation in tubular reactors Type de document : texte imprimé Auteurs : Alper A. Öncül, Auteur ; Gábor Janiga, Auteur ; Dominique Thévenin, Auteur Année de publication : 2009 Article en page(s) : p 999–1007 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : Computational  Fluid  Dynamics Résumé : Precipitation (also called reactive crystallization) processes are widely employed in the chemical industry in a variety of reactors and for different purposes. The properties and quality of the resulting particulate product are highly dependent on the mixing conditions in the reactor, since precipitation reactions are mostly fast: the reaction time is usually of the order of or shorter than the mixing time. Therefore, experimental and numerical investigations of precipitation processes under different hydrodynamic conditions constitute an interesting topic. In this work, precipitation of barium sulfate (BaSO4) is numerically investigated in two different tubular reactors, taking micromixing effects into account. Different models are employed with an increasing level of complexity. These models and the reaction kinetics are first explained. RANS-based axisymmetric computations are performed using the industrial CFD code FLUENT 6.3 at steady-state. The results of the simulations are then presented and discussed in detail. Moreover, quantitative comparisons with experimental data obtained from literature are also employed for validation. Finally, concluding remarks and possible model improvements are listed. [article] Comparison of various micromixing approaches for computational fluid dynamics simulation of barium sulfate precipitation in tubular reactors [texte imprimé] / Alper A. Öncül, Auteur ; Gábor Janiga, Auteur ; Dominique Thévenin, Auteur . - 2009 . - p 999–1007. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 999–1007 Mots-clés : Computational  Fluid  Dynamics Résumé : Precipitation (also called reactive crystallization) processes are widely employed in the chemical industry in a variety of reactors and for different purposes. The properties and quality of the resulting particulate product are highly dependent on the mixing conditions in the reactor, since precipitation reactions are mostly fast: the reaction time is usually of the order of or shorter than the mixing time. Therefore, experimental and numerical investigations of precipitation processes under different hydrodynamic conditions constitute an interesting topic. In this work, precipitation of barium sulfate (BaSO4) is numerically investigated in two different tubular reactors, taking micromixing effects into account. Different models are employed with an increasing level of complexity. These models and the reaction kinetics are first explained. RANS-based axisymmetric computations are performed using the industrial CFD code FLUENT 6.3 at steady-state. The results of the simulations are then presented and discussed in detail. Moreover, quantitative comparisons with experimental data obtained from literature are also employed for validation. Finally, concluding remarks and possible model improvements are listed.