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Modelling of mass transfer in gas-liquid stirred tanks agitated by Rushton turbine and CD-6 impeller: a scale-up study

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journal contribution
posted on 07.07.2009 by Jolius Gimbun, Chris Rielly, Zoltan Nagy
A combined computational fluid dynamics (CFD) and population balance model (PBM) approach has been applied to the simulation of gas-liquid stirred tanks agitated by (i) a Rushton turbine or (ii) a CD-6 impeller, operating at aeration numbers from 0.017 to 0.038. The multiphase simulations were realised via an Eulerian-Eulerian two-fluid model and the drag coefficient of spherical and distorted bubbles was modelled using the Ishii-Zuber equations. The effect of the void fraction on the drag coefficient was modelled using the correlation by Behzadi et al. (2004). The local bubble size distribution was obtained by solving the PBM using the quadrature method of moments (QMOM). The local kLa was estimated using both the Higbie penetration theory and the surface renewal model. The predicted gas-liquid hydrodynamics, local bubble sizes and dissolved oxygen concentration were in good agreement with experimental measurements reported in the literature. A slight improvement in the prediction of the aerated power number was obtained using the non-uniform bubble size distribution resulting from the coupled CFD-PBM simulation. Evaluation of the prospective scale-up approaches indicates a higher probability of maintaining a similar level of mass transfer in a larger tanks by keeping the Pg/V and VVM constant. Considering its predictive capability, the method outlined in this work can provide a useful scale-up evaluation of gas-liquid stirred tanks.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Citation

GIMBUN, J., RIELLY, C.D. and NAGY, Z.K., 2009. Modelling of mass transfer in gas-liquid stirred tanks agitated by Rushton turbine and CD-6 impeller: a scale-up study. Chemical Engineering Research and Design, 87 (4), pp. 437-451

Publisher

Elsevier / © The Institution of Chemical Engineers

Version

AM (Accepted Manuscript)

Publication date

2009

Notes

This article was published in the journal, Chemical Engineering Research and Design [© The Institution of Chemical Engineers ] and the definitive version is available at: http://www.elsevier.com/wps/find/journaldescription.cws_home/713871/description#description

ISSN

0263-8762

Language

en

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