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Semianalytical bubble - flow models for the development of a novel bubble - column simulator / Waldo Coetzee in Industrial & engineering chemistry research, Vol. 51 N° 21 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7398-7409 Titre : Semianalytical bubble - flow models for the development of a novel bubble - column simulator Type de document : texte imprimé Auteurs : Waldo Coetzee, Auteur ; Roelof L. J. Coetzer, Auteur ; Randhir Rawatlal, Auteur Année de publication : 2012 Article en page(s) : pp. 7398-7409 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bubble  column  Modeling  Bubble  flow Résumé : The simulation of bubble columns is a computationally expensive task because of the complexity of the hydrodynamics. A novel bubble-column simulation approach attempts to increase the computational efficiency by accounting for the flow regions around individual bubbles with an algebraic flow model. To improve the accuracy and reduce the number of parameters of the flow model, the linear combination of the creeping and potential flow analytical solutions is considered as a first approximation, which is found to accurately model large portions of the flow field within the considered operating range (Rc ≤ 270). The residual consists of significant nonlinear features, e.g., bubble wake, for which two statistically based strategies, i.e., Design and Analysis of Computer Experiments (DACE) and regression with empirical models, are evaluated. Both resulted in good fits, with the DACE strategy making fewer assumptions about the data, however, requiring more parameters. The combination of analytical and empirical models is therefore recommended for use as an accurate algebraic approximation of the flow field. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25948480 [article] Semianalytical bubble - flow models for the development of a novel bubble - column simulator [texte imprimé] / Waldo Coetzee, Auteur ; Roelof L. J. Coetzer, Auteur ; Randhir Rawatlal, Auteur . - 2012 . - pp. 7398-7409. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7398-7409 Mots-clés : Bubble  column  Modeling  Bubble  flow Résumé : The simulation of bubble columns is a computationally expensive task because of the complexity of the hydrodynamics. A novel bubble-column simulation approach attempts to increase the computational efficiency by accounting for the flow regions around individual bubbles with an algebraic flow model. To improve the accuracy and reduce the number of parameters of the flow model, the linear combination of the creeping and potential flow analytical solutions is considered as a first approximation, which is found to accurately model large portions of the flow field within the considered operating range (Rc ≤ 270). The residual consists of significant nonlinear features, e.g., bubble wake, for which two statistically based strategies, i.e., Design and Analysis of Computer Experiments (DACE) and regression with empirical models, are evaluated. Both resulted in good fits, with the DACE strategy making fewer assumptions about the data, however, requiring more parameters. The combination of analytical and empirical models is therefore recommended for use as an accurate algebraic approximation of the flow field. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25948480