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CFD simulation of bubble columns / M. R. Rampure in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8186–8192 Titre : CFD simulation of bubble columns : modeling of nonuniform gas distribution at sparger Type de document : texte imprimé Auteurs : M. R. Rampure, Auteur ; S. M. Mahajani, Auteur ; V. V. Ranade, Auteur Année de publication : 2009 Article en page(s) : pp. 8186–8192 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Bubble  columns  Plate  spargers  Nonuniform  gas  distribution  3D  CFD  model Résumé : Most laboratory bubble columns are equipped with sieve plate spargers. The sieve plate spargers are known to lead to nonuniform gas distribution. It is important to account for such nonuniform gas distribution at the sparger in the computational model before experimental data collected from such columns are used to fit the model parameters. In this article, such an attempt is made. A detailed, 3D CFD model was developed to simulate unsteady gas−liquid flows in bubble columns with sieve plate spargers. The sensitivity of the nonuniformity of gas distribution at the sparger with sparger resistance was examined. The model predictions were compared with the experimental data. The developed model and presented results will be useful for simulating industrial bubble columns. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018593 [article] CFD simulation of bubble columns : modeling of nonuniform gas distribution at sparger [texte imprimé] / M. R. Rampure, Auteur ; S. M. Mahajani, Auteur ; V. V. Ranade, Auteur . - 2009 . - pp. 8186–8192. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8186–8192 Mots-clés : Bubble  columns  Plate  spargers  Nonuniform  gas  distribution  3D  CFD  model Résumé : Most laboratory bubble columns are equipped with sieve plate spargers. The sieve plate spargers are known to lead to nonuniform gas distribution. It is important to account for such nonuniform gas distribution at the sparger in the computational model before experimental data collected from such columns are used to fit the model parameters. In this article, such an attempt is made. A detailed, 3D CFD model was developed to simulate unsteady gas−liquid flows in bubble columns with sieve plate spargers. The sensitivity of the nonuniformity of gas distribution at the sparger with sparger resistance was examined. The model predictions were compared with the experimental data. The developed model and presented results will be useful for simulating industrial bubble columns. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018593

Population balance modeling of liquid-liquid dispersions in homogeneous continuous-flow stirred tank / Singh, K. K. in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8121–8133 Titre : Population balance modeling of liquid-liquid dispersions in homogeneous continuous-flow stirred tank Type de document : texte imprimé Auteurs : Singh, K. K., Auteur ; S. M. Mahajani, Auteur ; K. T. Shenoy, Auteur Année de publication : 2009 Article en page(s) : pp. 8121–8133 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Population  balance  modeling  Dilute  phosphoric  acid  n-paraffin  Tributyl  phosphate  Di-2-ethyl  hexyl  phosphoric  acid Résumé : This work presents population balance modeling to predict representative drop sizes and drop size distributions in dispersions of dilute phosphoric acid in a mixture of n-paraffin, tributyl phosphate, and di-2-ethyl hexyl phosphoric acid (D2EHPA) created in a continuous-flow stirred tank agitated with a top-shrouded pump-mix impeller having four trapezoidal blades. The stirred tank has been assumed to be homogeneous. Three population balance models, differing in droplet breakage rate models, have been evaluated. A part of the experimental data has been used to obtain the optimum values of the parameters of all the three models. The remaining part of the experimental data has been used to compare the models for their ability to predict the representative drop diameters and the number probability density distributions. On the basis of this comparison, the best model has been identified. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800901b [article] Population balance modeling of liquid-liquid dispersions in homogeneous continuous-flow stirred tank [texte imprimé] / Singh, K. K., Auteur ; S. M. Mahajani, Auteur ; K. T. Shenoy, Auteur . - 2009 . - pp. 8121–8133. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8121–8133 Mots-clés : Population  balance  modeling  Dilute  phosphoric  acid  n-paraffin  Tributyl  phosphate  Di-2-ethyl  hexyl  phosphoric  acid Résumé : This work presents population balance modeling to predict representative drop sizes and drop size distributions in dispersions of dilute phosphoric acid in a mixture of n-paraffin, tributyl phosphate, and di-2-ethyl hexyl phosphoric acid (D2EHPA) created in a continuous-flow stirred tank agitated with a top-shrouded pump-mix impeller having four trapezoidal blades. The stirred tank has been assumed to be homogeneous. Three population balance models, differing in droplet breakage rate models, have been evaluated. A part of the experimental data has been used to obtain the optimum values of the parameters of all the three models. The remaining part of the experimental data has been used to compare the models for their ability to predict the representative drop diameters and the number probability density distributions. On the basis of this comparison, the best model has been identified. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800901b