Documents disponibles écrits par cet auteur

Investigation of discrete population balance models and breakage kernels for dilute emulsification systems / Per Julian Becker in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11358-11374 Titre : Investigation of discrete population balance models and breakage kernels for dilute emulsification systems Type de document : texte imprimé Auteurs : Per Julian Becker, Auteur ; François Puel, Auteur ; Reynald Henry, Auteur Année de publication : 2011 Article en page(s) : pp. 11358-11374 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Emulsification  Modeling  Population  balance Résumé : A novel in situ video probe with automated image analysis was used to develop a population balance model for a breakage-dominated liquid―liquid emulsification system. Experiments were performed in a 2 L tank, agitated by an axial flow propeller. The dispersed phase (ethylene glycol distearate) concentration was varied from 0.2 to 1.0% (w/w), and agitation rates were varied from 0.2 to 0.5 W/kg, in the presence of excess surfactant. Three numerical discretization methods were compared: fixed pivot, cell average, and finite volumes. The latter was then chosen for the subsequent simulations due to its rapidity and higher precision. An investigation of the different theories for bubble/droplet breakage was done and the frequencies (or breakage rate kernels) were compared. Four models were found applicable: the models developed by Coulaloglou and Tavlarides (Coulaloglou, C. A.; Tavlarides, L. L. Chem. Eng. Sci. 1977, 32, 1289); Sathyagal and Ramkrishna (Sathyagal, A. N.; Ramkrishna, D. Chem. Eng. Sci. 1996, 51, 1377); Alopaeus, Koskinen, and Keskinen (Alopaeus, V.; Koskinen, J.; Keskinen, K. L Chem. Eng. Sci. 1999, 54, 5887); and Baldyga and Podgorska (Baldyga, J.; Podgorska, W. Can. J. Chem. Eng. 1998, 76, 456). The one by Sathygal and Ramkrishna included the daughter size distribution. A log-normal daughter size distribution was chosen for the models by Coulaloglou and Tavlarides and Alopeus et al. Also, a normal distribution was used in the model by Baldyga and Podgorska. These models were compared with the experimental data to allow parameter identification. The model by Baldyga and Podgorska was found to give the best prediction of the shape of the distribution, its mean diameter, and standard deviation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573333 [article] Investigation of discrete population balance models and breakage kernels for dilute emulsification systems [texte imprimé] / Per Julian Becker, Auteur ; François Puel, Auteur ; Reynald Henry, Auteur . - 2011 . - pp. 11358-11374. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11358-11374 Mots-clés : Emulsification  Modeling  Population  balance Résumé : A novel in situ video probe with automated image analysis was used to develop a population balance model for a breakage-dominated liquid―liquid emulsification system. Experiments were performed in a 2 L tank, agitated by an axial flow propeller. The dispersed phase (ethylene glycol distearate) concentration was varied from 0.2 to 1.0% (w/w), and agitation rates were varied from 0.2 to 0.5 W/kg, in the presence of excess surfactant. Three numerical discretization methods were compared: fixed pivot, cell average, and finite volumes. The latter was then chosen for the subsequent simulations due to its rapidity and higher precision. An investigation of the different theories for bubble/droplet breakage was done and the frequencies (or breakage rate kernels) were compared. Four models were found applicable: the models developed by Coulaloglou and Tavlarides (Coulaloglou, C. A.; Tavlarides, L. L. Chem. Eng. Sci. 1977, 32, 1289); Sathyagal and Ramkrishna (Sathyagal, A. N.; Ramkrishna, D. Chem. Eng. Sci. 1996, 51, 1377); Alopaeus, Koskinen, and Keskinen (Alopaeus, V.; Koskinen, J.; Keskinen, K. L Chem. Eng. Sci. 1999, 54, 5887); and Baldyga and Podgorska (Baldyga, J.; Podgorska, W. Can. J. Chem. Eng. 1998, 76, 456). The one by Sathygal and Ramkrishna included the daughter size distribution. A log-normal daughter size distribution was chosen for the models by Coulaloglou and Tavlarides and Alopeus et al. Also, a normal distribution was used in the model by Baldyga and Podgorska. These models were compared with the experimental data to allow parameter identification. The model by Baldyga and Podgorska was found to give the best prediction of the shape of the distribution, its mean diameter, and standard deviation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573333