Journal
CHEMICAL ENGINEERING JOURNAL
Volume 383, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123197
Keywords
Bubble column; Tube bundle internals; Recirculation cell model; Two-bubble class approach; Hydrodynamics; Mass transfer
Categories
Funding
- European Research Council (ERC StG) [307360]
- European Research Council (ERC) [307360] Funding Source: European Research Council (ERC)
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An advanced recirculation cell model is proposed, which describes fluid dynamics and mass transfer in bubble columns with and without internals. The new model incorporates the cell approach of Shimizu et al. [Chem. Eng. J. 2000, 78, 21-28.] with latest breakup and coalescence kernels. Additionally, the gas flow structure is divided according to the two-bubble class assignment with fast-rising large bubbles in the column center and descending small bubbles near the wall following the liquid circulation pattern within the column's cross-section. The effect of internals is considered dividing the column further into 'sub-columns' derived from the internals' radial profile, which physically refines the liquid circulation pattern. The model was validated with experimental data of Moller et al. [Chem. Eng. Sci. 2018, 179, 265-283; Chem. Eng. Res. Des. 2018, 134; Chem. Eng. Sci. 2019] for narrow (0.1 m diameter) and pilot-scale (0.39 m diameter) columns, respectively, with and without internals operated up to the well-developed churn-turbulent flow regime. Predictions for bubble size distribution, total gas holdup, Sauter mean diameter as well as interfacial area and volumetric mass transfer coefficients agree well with the experiments.
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