Influence of the top impeller diameter on the gas dispersion in a sparged multi - impeller stirred tank / Yuyun Bao in Industrial & engineering chemistry research, Vol. 51 N° 38 (Septembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12411-12420 Titre : Influence of the top impeller diameter on the gas dispersion in a sparged multi - impeller stirred tank Type de document : texte imprimé Auteurs : Yuyun Bao, Auteur ; Jie Yang, Auteur ; Lei Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 12411-12420 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Stirred vessel Dispersion Agitator Résumé : The impeller configuration with a hollow half-elliptical blade dispersing turbine below two up-pumping wide-blade hydrofoils, identified as HEDT+2WHU and recommended in previous work, was used in this study. The effect of the top impeller diameter, ranging from 0.33T to 0.50T, on gas―liquid flow in a stirred tank of 0.48 m diameter was investigated by experimental and CFD methods. Power consumption, total gas holdup, and local void fraction were measured for the impeller configurations with different top impeller diameters. Results show that while the ratio of top impeller diameter to tank diameter (Dtop/T) increases from 0.33 to 0.50, the relative power demand (RPD) in a gas―liquid system decreases slightly. The increase of total gas holdup with rising gas flow rate becomes less evident as Dtop/T increases from 0.33 to 0.50. Local void fractions at the measurement points above the height of 0.8T increase significantly with the increase of top impeller diameter. When Dtop/T = 0.50, there is an extremely large voidage of about 50% just above the top impeller. The maximum voidage decreases with the decrease of top impeller diameter and almost disappears when Dtop/T = 0.33. CFD simulation based on the two-fluid model along with the population balance model (PBM) was used to investigate the effect of top impeller diameter on the gas―liquid flows. The power consumption, total gas holdup, and local void fraction predicted by the CFD approach were in reasonably good agreement with the experimental data. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399692 [article] Influence of the top impeller diameter on the gas dispersion in a sparged multi - impeller stirred tank [texte imprimé] / Yuyun Bao, Auteur ; Jie Yang, Auteur ; Lei Chen, Auteur . - 2012 . - pp. 12411-12420. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12411-12420 Mots-clés : Stirred vessel Dispersion Agitator Résumé : The impeller configuration with a hollow half-elliptical blade dispersing turbine below two up-pumping wide-blade hydrofoils, identified as HEDT+2WHU and recommended in previous work, was used in this study. The effect of the top impeller diameter, ranging from 0.33T to 0.50T, on gas―liquid flow in a stirred tank of 0.48 m diameter was investigated by experimental and CFD methods. Power consumption, total gas holdup, and local void fraction were measured for the impeller configurations with different top impeller diameters. Results show that while the ratio of top impeller diameter to tank diameter (Dtop/T) increases from 0.33 to 0.50, the relative power demand (RPD) in a gas―liquid system decreases slightly. The increase of total gas holdup with rising gas flow rate becomes less evident as Dtop/T increases from 0.33 to 0.50. Local void fractions at the measurement points above the height of 0.8T increase significantly with the increase of top impeller diameter. When Dtop/T = 0.50, there is an extremely large voidage of about 50% just above the top impeller. The maximum voidage decreases with the decrease of top impeller diameter and almost disappears when Dtop/T = 0.33. CFD simulation based on the two-fluid model along with the population balance model (PBM) was used to investigate the effect of top impeller diameter on the gas―liquid flows. The power consumption, total gas holdup, and local void fraction predicted by the CFD approach were in reasonably good agreement with the experimental data. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399692

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