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Modeling of gas–liquid mass transfer in a stirred tank bioreactor agitated by a Rushton turbine or a new pitched blade impeller

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Abstract

A combined computational fluid dynamics (CFD) and population balance model (PBM) approach has been applied to simulate hydrodynamics and mass transfer in a 0.18 m3 gas–liquid stirred bioreactor agitated by (1) a Rushton turbine, and (2) a new pitched blade geometry with rotating cartridges. The operating conditions chosen were motivated by typical settings used for culturing mammalian cells. The effects of turbulence, rotating flow, bubbles breakage and coalescence were simulated using the k–ε, multiple reference frame (MRF), Sliding mesh (SM) and PBM approaches, respectively. Considering the new pitched blade geometry with rotating aeration microspargers, \(k_{\text{L}} a\) mass transfer was estimated to be 34 times higher than the conventional Rushton turbine set-up. Notably, the impeller power consumption was modeled to be about 50 % lower. Independent \(k_{\text{L}} a\) measurements applying the same operational conditions confirmed this finding. Motivated by these simulated and experimental results, the new aeration and stirring device is qualified as a very promising tool especially useful for cell culture applications which are characterized by the challenging problem of achieving relatively high mass transfer conditions while inserting only low stirrer energy.

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Acknowledgments

The study is part of a cooperation project together with Industrieberatung Kloss (IBK, Taufkirchen, Germany) and the company MUT Tschamber Misch-und Trenntechnik GmbH (Wehr, Germany) and funded by AIF (Grant number: KF 2921901AJ1/KF 2915501AJ1).

Conflict of interest

The authors have declared no conflict of interest.

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Authors and Affiliations

  1. Grupo de Biotecnología, Sede de Investigación Universitaria (SIU), Universidad de Antioquia, Carrera 53 N° 61–30, Medellín, Colombia

    Ricardo Gelves

  2. Institut für Bioverfahrenstechnik, Universität Stuttgart, Allmandring 31, 50569, Stuttgart, Germany

    Ricardo Gelves, A. Dietrich & Ralf Takors

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  1. Ricardo Gelves
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  2. A. Dietrich
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Correspondence to Ricardo Gelves.

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Gelves, R., Dietrich, A. & Takors, R. Modeling of gas–liquid mass transfer in a stirred tank bioreactor agitated by a Rushton turbine or a new pitched blade impeller. Bioprocess Biosyst Eng 37, 365–375 (2014). https://doi.org/10.1007/s00449-013-1001-8

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  • DOI: https://doi.org/10.1007/s00449-013-1001-8

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