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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

Hydrodynamic characteristics of dual- impeller configurations in a multiple-phase stirred tank / Wang, Tao in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1001–1009 Titre : Hydrodynamic characteristics of dual- impeller configurations in a multiple-phase stirred tank Type de document : texte imprimé Auteurs : Wang, Tao, Auteur ; Gengzhi Yu, Auteur ; Yumei Yong, Auteur Année de publication : 2010 Article en page(s) : pp. 1001–1009 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Hydrodynamic--Dual-Impeller--Configurations--Multiple--Tank Résumé : Experiments are carried out in a baffled flat-bottom stirred tank to test five dual-impeller configurations, including a new type of impeller, alternate blade disk turbine (ABDT). Power consumptions in gas−liquid, liquid−solid, and gas−liquid−solid systems are determined by the shaft-torque method. It is found that the configuration with an axial impeller consumes less energy than that with a radial one in all multiple-phase systems. The correlations between power input and gas flow rate or solid concentration are also discussed. Power number reaches a limit with the increase of Reynolds number in liquid−solid systems. Aeration is proved to be harmful to solid suspension. Mixing time and solid particle concentration are measured by the electric conductivity method and Powder Voidmeter PC-6, respectively. The mixing modes (axial and radial) are proposed in the light of impeller types and flow patterns. The experimental results show that the mixing time of the double radial impeller configuration is the shortest, while the double axial impeller combination performs worst. Judging from the axial solid particle concentration distribution and overall suspension uniformity, the combination taking pitched blade turbine downflow (PBTD) as the lower impeller achieves the best solid suspension. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006886 [article] Hydrodynamic characteristics of dual- impeller configurations in a multiple-phase stirred tank [texte imprimé] / Wang, Tao, Auteur ; Gengzhi Yu, Auteur ; Yumei Yong, Auteur . - 2010 . - pp. 1001–1009. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1001–1009 Mots-clés : Hydrodynamic--Dual-Impeller--Configurations--Multiple--Tank Résumé : Experiments are carried out in a baffled flat-bottom stirred tank to test five dual-impeller configurations, including a new type of impeller, alternate blade disk turbine (ABDT). Power consumptions in gas−liquid, liquid−solid, and gas−liquid−solid systems are determined by the shaft-torque method. It is found that the configuration with an axial impeller consumes less energy than that with a radial one in all multiple-phase systems. The correlations between power input and gas flow rate or solid concentration are also discussed. Power number reaches a limit with the increase of Reynolds number in liquid−solid systems. Aeration is proved to be harmful to solid suspension. Mixing time and solid particle concentration are measured by the electric conductivity method and Powder Voidmeter PC-6, respectively. The mixing modes (axial and radial) are proposed in the light of impeller types and flow patterns. The experimental results show that the mixing time of the double radial impeller configuration is the shortest, while the double axial impeller combination performs worst. Judging from the axial solid particle concentration distribution and overall suspension uniformity, the combination taking pitched blade turbine downflow (PBTD) as the lower impeller achieves the best solid suspension. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006886