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Experimental study on liquid–liquid macromixing in a stirred tank / Yanchun Zhao in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 5952-5958 Titre : Experimental study on liquid–liquid macromixing in a stirred tank Type de document : texte imprimé Auteurs : Yanchun Zhao, Auteur ; Xiangyang Li, Auteur ; Jingcai Cheng, Auteur Année de publication : 2011 Article en page(s) : pp. 5952-5958 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Stirred  vessel  Macromixing Résumé : In this paper, the experimental data on the mixing time and power consumption of two immiscible liquids in a mechanically agitated baffled tank are presented. The electric conductivity method was taken for the measurement of the mixing time and the shaft-torque method for the power consumption measurement Tap water was used as the continuous phase and kerosene the dispersed phase. The effects of the agitation speed, type of impeller, clearance of the impeller off the tank bottom, volume fraction of the dispersed phase, physical properties of the liquids, and probe position on the macromixing of the liquid-liquid system were studied. The phenomena of macromixing are largely similar to those of single-liquid and gas-liquid stirred tanks. The experiment indicates that the flow field and turbulence can be dampened at high volume fraction of the dispersed phase while enhanced at low percentage. The mixing time becomes longer with increasing viscosity of the dispersed phase. The results show that the pitched blade turbine downflow is more efficient for macromixing than the others tested in this work. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158892 [article] Experimental study on liquid–liquid macromixing in a stirred tank [texte imprimé] / Yanchun Zhao, Auteur ; Xiangyang Li, Auteur ; Jingcai Cheng, Auteur . - 2011 . - pp. 5952-5958. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 5952-5958 Mots-clés : Stirred  vessel  Macromixing Résumé : In this paper, the experimental data on the mixing time and power consumption of two immiscible liquids in a mechanically agitated baffled tank are presented. The electric conductivity method was taken for the measurement of the mixing time and the shaft-torque method for the power consumption measurement Tap water was used as the continuous phase and kerosene the dispersed phase. The effects of the agitation speed, type of impeller, clearance of the impeller off the tank bottom, volume fraction of the dispersed phase, physical properties of the liquids, and probe position on the macromixing of the liquid-liquid system were studied. The phenomena of macromixing are largely similar to those of single-liquid and gas-liquid stirred tanks. The experiment indicates that the flow field and turbulence can be dampened at high volume fraction of the dispersed phase while enhanced at low percentage. The mixing time becomes longer with increasing viscosity of the dispersed phase. The results show that the pitched blade turbine downflow is more efficient for macromixing than the others tested in this work. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158892

Experimental study on surface aerators stirred by triple impellers / Xiangyang Li in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8752–8756 Titre : Experimental study on surface aerators stirred by triple impellers Type de document : texte imprimé Auteurs : Xiangyang Li, Auteur ; Gengzhi Yu, Auteur ; Chao Yang, Auteur Année de publication : 2010 Article en page(s) : pp. 8752–8756 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Stirred  vessel  Gas-liquid  mass  transfer  Triple-impeller  Surface  aeration Résumé : In a stirred vessel with the aspect ratio of 2.4, the gas−liquid mass transfer characteristics of triple-impeller configurations with surface aeration have been studied. The way by adding one or more impellers below the aerating impeller could not overcome the problem of poor gas dispersion in the region close to the bottom of the gas−liquid vessel stirred only by a surface aerator. With the combination of surface aeration and sparger aeration, gas dispersion is greatly improved. Triple-impeller configurations and volumetric gas flow rates are optimized based on the volumetric mass transfer coefficient per power consumption. It is found that the sparging gas has only a little effect on the surface aeration, because the vessel is stirred by the triple-impeller configuration and with a larger aspect ratio. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900623m [article] Experimental study on surface aerators stirred by triple impellers [texte imprimé] / Xiangyang Li, Auteur ; Gengzhi Yu, Auteur ; Chao Yang, Auteur . - 2010 . - pp. 8752–8756. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8752–8756 Mots-clés : Stirred  vessel  Gas-liquid  mass  transfer  Triple-impeller  Surface  aeration Résumé : In a stirred vessel with the aspect ratio of 2.4, the gas−liquid mass transfer characteristics of triple-impeller configurations with surface aeration have been studied. The way by adding one or more impellers below the aerating impeller could not overcome the problem of poor gas dispersion in the region close to the bottom of the gas−liquid vessel stirred only by a surface aerator. With the combination of surface aeration and sparger aeration, gas dispersion is greatly improved. Triple-impeller configurations and volumetric gas flow rates are optimized based on the volumetric mass transfer coefficient per power consumption. It is found that the sparging gas has only a little effect on the surface aeration, because the vessel is stirred by the triple-impeller configuration and with a larger aspect ratio. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900623m