Documents disponibles écrits par cet auteur

Fractal impeller for stirred tank reactors / Amol A. Kulkarni in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7667-7676 Titre : Fractal impeller for stirred tank reactors Type de document : texte imprimé Auteurs : Amol A. Kulkarni, Auteur ; Neha Jha, Auteur ; Abhishek Singh, Auteur Année de publication : 2011 Article en page(s) : pp. 7667-7676 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Stirred  tank  reactor  Agitator  Fractal Résumé : Stirred tank reactors are used for variety of applications at different scales of operation. The conventional impellers tend to develop regions having nonuniform energy dissipation rates in the stirred reactor. In this work, we propose a novel fractal impeller, which helps in reducing such nonuniformities and help develop a uniform randomness throughout the reactor. The impeller geometry is discussed in detail. Experimental measurements of the power consumption, mixing time, suspension quality, and the ability for gas dispersion were carried out, and the performance is compared with the conventional impellers. The impeller is seen to have a low power number, and it can generate a uniform suspension of particles even at relatively lower impeller speeds and can efficiently disperse gas into liquid to yield relatively higher gas hold-up values. The Fourier analysis of the power consumption time series data indicates that no specific prominent frequency events exist in the reactor, and the spectrum showed several frequency events to exist in the reactor with almost identical prominence. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239083 [article] Fractal impeller for stirred tank reactors [texte imprimé] / Amol A. Kulkarni, Auteur ; Neha Jha, Auteur ; Abhishek Singh, Auteur . - 2011 . - pp. 7667-7676. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7667-7676 Mots-clés : Stirred  tank  reactor  Agitator  Fractal Résumé : Stirred tank reactors are used for variety of applications at different scales of operation. The conventional impellers tend to develop regions having nonuniform energy dissipation rates in the stirred reactor. In this work, we propose a novel fractal impeller, which helps in reducing such nonuniformities and help develop a uniform randomness throughout the reactor. The impeller geometry is discussed in detail. Experimental measurements of the power consumption, mixing time, suspension quality, and the ability for gas dispersion were carried out, and the performance is compared with the conventional impellers. The impeller is seen to have a low power number, and it can generate a uniform suspension of particles even at relatively lower impeller speeds and can efficiently disperse gas into liquid to yield relatively higher gas hold-up values. The Fourier analysis of the power consumption time series data indicates that no specific prominent frequency events exist in the reactor, and the spectrum showed several frequency events to exist in the reactor with almost identical prominence. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239083

Hydrodynamics of liquid–liquid dispersion in an advanced-flow reactor / Maria José Nieves-Remacha in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp 16251–16262 Titre : Hydrodynamics of liquid–liquid dispersion in an advanced-flow reactor Type de document : texte imprimé Auteurs : Maria José Nieves-Remacha, Auteur ; Amol A. Kulkarni, Auteur ; Klavs F. Jensen, Auteur Année de publication : 2013 Article en page(s) : pp 16251–16262 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrodynamics  Mass  transfer Résumé : Hydrodynamics and mass transfer of immiscible liquid–liquid flows are explored in an Advanced-Flow Reactor (AFR). These systems are emerging as one of the major commercial systems for small scale continuous flow chemistry, and characterization of the transport phenomena is critical for reaction implementation. With hexane/water as a model system, we use flow visualization techniques to determine drop size distribution, hexane holdup, and specific interfacial areas for a phase flow rate range of 10–80 mL/min. The complex geometry of the AFR with its continuously changing cross section along the flow path and strategically placed obstacles creates pressure changes that cause drop breakup and enhance mass transfer. Observations show that a wide range of average drop size (0.33–1.3 mm) can be achieved in the AFR depending upon the inlet flow rates and inlet composition. Pressure drop measurements are performed to estimate the power consumption and are used to compare the efficiency of AFR with conventional liquid–liquid contactors. The analysis shows that, similar to microreactors, the AFR can provide specific interfacial areas (1000–10 000 m–1) and overall mass transfer coefficients (1.9–41 s–1) a few orders of magnitude larger than conventional stirred tank reactors and also the static mixers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301821k [article] Hydrodynamics of liquid–liquid dispersion in an advanced-flow reactor [texte imprimé] / Maria José Nieves-Remacha, Auteur ; Amol A. Kulkarni, Auteur ; Klavs F. Jensen, Auteur . - 2013 . - pp 16251–16262. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp 16251–16262 Mots-clés : Hydrodynamics  Mass  transfer Résumé : Hydrodynamics and mass transfer of immiscible liquid–liquid flows are explored in an Advanced-Flow Reactor (AFR). These systems are emerging as one of the major commercial systems for small scale continuous flow chemistry, and characterization of the transport phenomena is critical for reaction implementation. With hexane/water as a model system, we use flow visualization techniques to determine drop size distribution, hexane holdup, and specific interfacial areas for a phase flow rate range of 10–80 mL/min. The complex geometry of the AFR with its continuously changing cross section along the flow path and strategically placed obstacles creates pressure changes that cause drop breakup and enhance mass transfer. Observations show that a wide range of average drop size (0.33–1.3 mm) can be achieved in the AFR depending upon the inlet flow rates and inlet composition. Pressure drop measurements are performed to estimate the power consumption and are used to compare the efficiency of AFR with conventional liquid–liquid contactors. The analysis shows that, similar to microreactors, the AFR can provide specific interfacial areas (1000–10 000 m–1) and overall mass transfer coefficients (1.9–41 s–1) a few orders of magnitude larger than conventional stirred tank reactors and also the static mixers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301821k