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Computed tomographic investigation of the influence of gas sparger design on gas holdup distribution in a bubble column / B. C. Ong in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 58-68 Titre : Computed tomographic investigation of the influence of gas sparger design on gas holdup distribution in a bubble column Type de document : texte imprimé Auteurs : B. C. Ong, Editeur scientifique ; P. Gupta, Editeur scientifique ; A. Youssef, Editeur scientifique Année de publication : 2009 Article en page(s) : p. 58-68 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Computed  tomographic  investigation  Gas  sparger  design Résumé : The effect of gas sparger design on the gas holdup radial profile in a bubble column (with a diameter of 0.162 m) has been studied using γ-ray computed tomography (CT). Six different configurations of gas spargers were examined, using an air−water system for selected superficial gas velocities from 2 cm/s to 30 cm/s, covering the homogeneous and heterogeneous (churn-turbulent) flow regimes. Two operating pressures were used: 1 and 4 atm. Differences were found between the gas holdup distributions produced by different spargers at dimensionless radii of r/R < 0.8 in the central region of the column. The cross and single nozzle spargers produced closely similar gas holdup distributions, while the perforated plate sparger produced a higher gas holdup when compared to other spargers with the same percentage open area (POA). At 4 atm, the sparger design did not have a significant effect on the gas holdup profiles, compared to atmospheric pressure, except for the case of the single-hole sparger, which was found to yield a higher gas holdup. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800516s [article] Computed tomographic investigation of the influence of gas sparger design on gas holdup distribution in a bubble column [texte imprimé] / B. C. Ong, Editeur scientifique ; P. Gupta, Editeur scientifique ; A. Youssef, Editeur scientifique . - 2009 . - p. 58-68. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 58-68 Mots-clés : Computed  tomographic  investigation  Gas  sparger  design Résumé : The effect of gas sparger design on the gas holdup radial profile in a bubble column (with a diameter of 0.162 m) has been studied using γ-ray computed tomography (CT). Six different configurations of gas spargers were examined, using an air−water system for selected superficial gas velocities from 2 cm/s to 30 cm/s, covering the homogeneous and heterogeneous (churn-turbulent) flow regimes. Two operating pressures were used: 1 and 4 atm. Differences were found between the gas holdup distributions produced by different spargers at dimensionless radii of r/R < 0.8 in the central region of the column. The cross and single nozzle spargers produced closely similar gas holdup distributions, while the perforated plate sparger produced a higher gas holdup when compared to other spargers with the same percentage open area (POA). At 4 atm, the sparger design did not have a significant effect on the gas holdup profiles, compared to atmospheric pressure, except for the case of the single-hole sparger, which was found to yield a higher gas holdup. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800516s