An adaptive model for gas-liquid mass transfer in a Taylor vortex reactor

Xi Gao, Bo Kong, Mahdi Ramezani, Michael G. Olsen, R. Dennis Vigil*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Gas-liquid Taylor-Couette flow devices have attracted interest for use as chemical and biological reactors, and consequently the accurate prediction of interphase mass transfer coefficients is crucial for their design and optimization. However, gas-liquid mass transport in these systems depends on many factors such as the local velocity field, turbulent energy dissipation rate, and the spatial distribution and size of bubbles, which in turn have complicated dependencies on process, geometric, and hydrodynamic parameters. Here we overcome these problems by employing a recently developed and validated Eulerian two-phase CFD model to compute local values of the mass transfer coefficient based upon the Higbie theory. This approach requires good estimates for mass transfer exposure times, and these are obtained by using a novel approach that automatically selects the appropriate expression (either the penetration model or eddy cell model) based upon local flow conditions. By comparing the simulation predictions with data from corresponding oxygen mass transfer experiments, it is demonstrated that this adaptive mass transfer model provides an excellent description for both the local and global mass transfer of oxygen in a semibatch gas-liquid Taylor-Couette reactor for a wide range of azimuthal Reynolds numbers and axial gas flow rates.

Original languageEnglish
Pages (from-to)433-445
Number of pages13
JournalInternational Journal of Heat and Mass Transfer
Volume91
DOIs
StatePublished - 17 Aug 2015
Externally publishedYes

Keywords

  • CFD simulation
  • Gas-liquid flow
  • Mass transfer
  • Taylor-Couette flow

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