Documents disponibles écrits par cet auteur

Characterization of the hydrodynamics and mixing performance of a split - and - recombination (SAR) prototype microreactor and a multilamination commercial microreactor / Lionel S. Méndez-Portillo in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 994-1005 Titre : Characterization of the hydrodynamics and mixing performance of a split - and - recombination (SAR) prototype microreactor and a multilamination commercial microreactor Type de document : texte imprimé Auteurs : Lionel S. Méndez-Portillo, Auteur ; Louis Fradette, Auteur ; Charles Dubois, Auteur Année de publication : 2012 Article en page(s) : pp. 994-1005 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microreactor  Mixing  Hydrodynamics Résumé : The aim of this work was to quantify the performance of two well-known mixing mechanisms used in microreactors: the split-and-recombination (SAR) and the multilamination by means of an interdigital structure. The residence time distribution (RTD) and the mixing performance in laminar flow regime were experimentally characterized by the tracer pulse-input technique and the iodide-iodate Villermaux/Dushman method. RTD analysis indicates bypassing caused by uneven flow distribution in the manifolds of both microreactors. A decrease of the quadratic dependence of axial dispersion on fluid velocity is produced by the improved tracer homogenization achieved in the microfluidic structures. The iodide-iodate method shows that below a critical Damköhler number the microreactors exhibit a superior mixing performance than a conventional T-junction. The interdigital microreactor displayed the best mixing capabilities for all the flow conditions investigated. However, the estimation of energy dissipation confirms that the improved mixing performance of the interdigital unit is obtained at the expense of greater energy expenditure when compared with the split-and-recombination microreactor. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476432 [article] Characterization of the hydrodynamics and mixing performance of a split - and - recombination (SAR) prototype microreactor and a multilamination commercial microreactor [texte imprimé] / Lionel S. Méndez-Portillo, Auteur ; Louis Fradette, Auteur ; Charles Dubois, Auteur . - 2012 . - pp. 994-1005. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 994-1005 Mots-clés : Microreactor  Mixing  Hydrodynamics Résumé : The aim of this work was to quantify the performance of two well-known mixing mechanisms used in microreactors: the split-and-recombination (SAR) and the multilamination by means of an interdigital structure. The residence time distribution (RTD) and the mixing performance in laminar flow regime were experimentally characterized by the tracer pulse-input technique and the iodide-iodate Villermaux/Dushman method. RTD analysis indicates bypassing caused by uneven flow distribution in the manifolds of both microreactors. A decrease of the quadratic dependence of axial dispersion on fluid velocity is produced by the improved tracer homogenization achieved in the microfluidic structures. The iodide-iodate method shows that below a critical Damköhler number the microreactors exhibit a superior mixing performance than a conventional T-junction. The interdigital microreactor displayed the best mixing capabilities for all the flow conditions investigated. However, the estimation of energy dissipation confirms that the improved mixing performance of the interdigital unit is obtained at the expense of greater energy expenditure when compared with the split-and-recombination microreactor. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476432

Revisiting the performance of a coaxial mixer / Maya Farhat in Industrial & engineering chemistry research, Vol. 47 N°10 (Mai 2008)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3562–3567 Titre : Revisiting the performance of a coaxial mixer Type de document : texte imprimé Auteurs : Maya Farhat, Auteur ; Louis Fradette, Auteur ; Philippe A. Tanguy, Auteur Année de publication : 2008 Article en page(s) : p. 3562–3567 Note générale : Bibliogr. 3567 Langues : Anglais (eng) Mots-clés : Coaxial  mixer  ;  Co-rotating  ;  Reynolds  number Résumé : The performance of a coaxial mixer combining an anchor and a Rushton turbine was investigated for different diameter ratios and rotating modes in the laminar and transition flow regimes. Based on mixing efficiency criteria, this study confirmed that the co-rotating mode is consistently yielding the best results in the laminar and early transition regimes. The best performance was obtained for a turbine to tank diameter ratio of 1/3. In the upper transition and turbulent regimes, the best performance was obtained with the anchor at rest acting like two opposed baffles. With such a configuration, the optimum diameter ratio was found to be 1/2. New definitions of Reynolds number and power number were also introduced based on new characteristic diameter and speed. These correlations shown to be applicable for radial and axial impellers and are significantly better than the ones proposed in the literature. [article] Revisiting the performance of a coaxial mixer [texte imprimé] / Maya Farhat, Auteur ; Louis Fradette, Auteur ; Philippe A. Tanguy, Auteur . - 2008 . - p. 3562–3567. Bibliogr. 3567 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3562–3567 Mots-clés : Coaxial  mixer  ;  Co-rotating  ;  Reynolds  number Résumé : The performance of a coaxial mixer combining an anchor and a Rushton turbine was investigated for different diameter ratios and rotating modes in the laminar and transition flow regimes. Based on mixing efficiency criteria, this study confirmed that the co-rotating mode is consistently yielding the best results in the laminar and early transition regimes. The best performance was obtained for a turbine to tank diameter ratio of 1/3. In the upper transition and turbulent regimes, the best performance was obtained with the anchor at rest acting like two opposed baffles. With such a configuration, the optimum diameter ratio was found to be 1/2. New definitions of Reynolds number and power number were also introduced based on new characteristic diameter and speed. These correlations shown to be applicable for radial and axial impellers and are significantly better than the ones proposed in the literature.