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Fluid dynamic study of a semicylindrical spouted bed / Rodrigo Béttega in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11181–11188 Titre : Fluid dynamic study of a semicylindrical spouted bed : evaluation of the shear stress effects in the flat wall region using computational fluid dynamics Type de document : texte imprimé Auteurs : Rodrigo Béttega, Auteur ; Cezar A. da Rosa, Auteur ; Ronaldo G. Corrêa, Auteur Année de publication : 2010 Article en page(s) : pp. 11181–11188 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluid--Dynamic--Semicylindrical--Spouted--Evaluation  --Shear--Stress--Effects--Region--Using--Computational--Fluid  Dynamics Résumé : Using a semicylindrical spouted bed to obtain experimental data of cylindrical vessels is an old technique and it has already been widely studied by experimental procedures. In the mathematical modeling of semicylindrical spouted beds, the specularity coefficient is one of the ways of including the effect of shear stress in the solid phase promoted by the flat wall. This parameter can be included in the boundary condition of a semicylindrical spouted bed to represent this friction effect. The main purpose of this paper is to discuss the numerical influence of the specularity coefficient on the fluid and solid dynamics of the semicylindrical vessel. Several numerical simulations were performed using the CFD (computational fluid dynamics) technique, by Euler−Euler 3D modeling, for different parameter values of the specularity coefficient. Experimental pressure data are used to verify these simulations. Numerical and experimental results showed good agreement, and the simulations indicated that particle velocity profiles and solid volume fraction were strongly influenced by the specularity coefficient on the spout channel region. Nonetheless, numerical static pressure and fluid velocity have not presented considerable dependence on this coefficient. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900973x [article] Fluid dynamic study of a semicylindrical spouted bed : evaluation of the shear stress effects in the flat wall region using computational fluid dynamics [texte imprimé] / Rodrigo Béttega, Auteur ; Cezar A. da Rosa, Auteur ; Ronaldo G. Corrêa, Auteur . - 2010 . - pp. 11181–11188. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11181–11188 Mots-clés : Fluid--Dynamic--Semicylindrical--Spouted--Evaluation  --Shear--Stress--Effects--Region--Using--Computational--Fluid  Dynamics Résumé : Using a semicylindrical spouted bed to obtain experimental data of cylindrical vessels is an old technique and it has already been widely studied by experimental procedures. In the mathematical modeling of semicylindrical spouted beds, the specularity coefficient is one of the ways of including the effect of shear stress in the solid phase promoted by the flat wall. This parameter can be included in the boundary condition of a semicylindrical spouted bed to represent this friction effect. The main purpose of this paper is to discuss the numerical influence of the specularity coefficient on the fluid and solid dynamics of the semicylindrical vessel. Several numerical simulations were performed using the CFD (computational fluid dynamics) technique, by Euler−Euler 3D modeling, for different parameter values of the specularity coefficient. Experimental pressure data are used to verify these simulations. Numerical and experimental results showed good agreement, and the simulations indicated that particle velocity profiles and solid volume fraction were strongly influenced by the specularity coefficient on the spout channel region. Nonetheless, numerical static pressure and fluid velocity have not presented considerable dependence on this coefficient. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900973x

Fluid dynamic study of a semicylindrical spouted bed / Rodrigo Béttega in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11181–11188 Titre : Fluid dynamic study of a semicylindrical spouted bed : evaluation of the shear stress effects in the flat wall region using computational fluid dynamics Type de document : texte imprimé Auteurs : Rodrigo Béttega, Auteur ; Cezar A. da Rosa, Auteur ; Ronaldo G. Corrêa, Auteur Année de publication : 2010 Article en page(s) : pp. 11181–11188 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cylindrical  vessels  Semicylindrical  spouted  beds  Computational  fluid  dynamics Résumé : Using a semicylindrical spouted bed to obtain experimental data of cylindrical vessels is an old technique and it has already been widely studied by experimental procedures. In the mathematical modeling of semicylindrical spouted beds, the specularity coefficient is one of the ways of including the effect of shear stress in the solid phase promoted by the flat wall. This parameter can be included in the boundary condition of a semicylindrical spouted bed to represent this friction effect. The main purpose of this paper is to discuss the numerical influence of the specularity coefficient on the fluid and solid dynamics of the semicylindrical vessel. Several numerical simulations were performed using the CFD (computational fluid dynamics) technique, by Euler−Euler 3D modeling, for different parameter values of the specularity coefficient. Experimental pressure data are used to verify these simulations. Numerical and experimental results showed good agreement, and the simulations indicated that particle velocity profiles and solid volume fraction were strongly influenced by the specularity coefficient on the spout channel region. Nonetheless, numerical static pressure and fluid velocity have not presented considerable dependence on this coefficient. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900973x [article] Fluid dynamic study of a semicylindrical spouted bed : evaluation of the shear stress effects in the flat wall region using computational fluid dynamics [texte imprimé] / Rodrigo Béttega, Auteur ; Cezar A. da Rosa, Auteur ; Ronaldo G. Corrêa, Auteur . - 2010 . - pp. 11181–11188. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11181–11188 Mots-clés : Cylindrical  vessels  Semicylindrical  spouted  beds  Computational  fluid  dynamics Résumé : Using a semicylindrical spouted bed to obtain experimental data of cylindrical vessels is an old technique and it has already been widely studied by experimental procedures. In the mathematical modeling of semicylindrical spouted beds, the specularity coefficient is one of the ways of including the effect of shear stress in the solid phase promoted by the flat wall. This parameter can be included in the boundary condition of a semicylindrical spouted bed to represent this friction effect. The main purpose of this paper is to discuss the numerical influence of the specularity coefficient on the fluid and solid dynamics of the semicylindrical vessel. Several numerical simulations were performed using the CFD (computational fluid dynamics) technique, by Euler−Euler 3D modeling, for different parameter values of the specularity coefficient. Experimental pressure data are used to verify these simulations. Numerical and experimental results showed good agreement, and the simulations indicated that particle velocity profiles and solid volume fraction were strongly influenced by the specularity coefficient on the spout channel region. Nonetheless, numerical static pressure and fluid velocity have not presented considerable dependence on this coefficient. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900973x

Pressure drop and liquid distribution in a venturi scrubber / Vadila G. Guerra in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8049-8060 Titre : Pressure drop and liquid distribution in a venturi scrubber : Experimental data and CFD simulation Type de document : texte imprimé Auteurs : Vadila G. Guerra, Auteur ; Rodrigo Béttega, Auteur ; José A. S. Gonçalves, Auteur Année de publication : 2012 Article en page(s) : pp. 8049-8060 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Computational  fluid  dynamics  Venturi  scrubber  Hydrodynamics  Pressure  drop Résumé : Venturi scrubbers are widely used to control industrial emissions, because of their high efficiency in the removal of particles from gases. To correctly size and design these equipments, detailed information on the fluid dynamics is very important. The purpose of this article is to study, both experimentally and through CFD simulations, the fluid dynamics of the gas and liquid phases in the core of the throat of a rectangular Venturi scrubber under different experimental conditions. The variables studied were the pressure and the volumetric fraction of each phase. The standard κ―ε turbulence model and the volume of fluid (VOF) multiphase model, as implemented in the ANSYS Fluent 12.0 software, were employed. Liquid distribution inside the throat of the Venturi was studied experimentally, using optical imaging techniques. The results indicate that the model and numerical procedures were able to describe both the pressure drop profile and the liquid jet formation and trajectory successfully. The results suggest that, for the same gas and liquid flow rates, the number of liquid injection orifices does not affect the pressure drop, but affects significantly the liquid fraction distribution profile inside the equipment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990317 [article] Pressure drop and liquid distribution in a venturi scrubber : Experimental data and CFD simulation [texte imprimé] / Vadila G. Guerra, Auteur ; Rodrigo Béttega, Auteur ; José A. S. Gonçalves, Auteur . - 2012 . - pp. 8049-8060. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8049-8060 Mots-clés : Computational  fluid  dynamics  Venturi  scrubber  Hydrodynamics  Pressure  drop Résumé : Venturi scrubbers are widely used to control industrial emissions, because of their high efficiency in the removal of particles from gases. To correctly size and design these equipments, detailed information on the fluid dynamics is very important. The purpose of this article is to study, both experimentally and through CFD simulations, the fluid dynamics of the gas and liquid phases in the core of the throat of a rectangular Venturi scrubber under different experimental conditions. The variables studied were the pressure and the volumetric fraction of each phase. The standard κ―ε turbulence model and the volume of fluid (VOF) multiphase model, as implemented in the ANSYS Fluent 12.0 software, were employed. Liquid distribution inside the throat of the Venturi was studied experimentally, using optical imaging techniques. The results indicate that the model and numerical procedures were able to describe both the pressure drop profile and the liquid jet formation and trajectory successfully. The results suggest that, for the same gas and liquid flow rates, the number of liquid injection orifices does not affect the pressure drop, but affects significantly the liquid fraction distribution profile inside the equipment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990317