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Partic. vol. 33 pp. 80-90 (August 2017)
doi: 10.1016/j.partic.2016.09.008

Discrete particle simulations of bubble-to-emulsion phase mass transfer in single-bubble fluidized beds

Lianghui Tan, Ivo Roghair, Martin van Sint Annaland*

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M.v.SintAnnaland@tue.nl

Highlights

    • Bubble-to-emulsion phase mass transfer in single-bubble fluidized beds was studied with DPM model. • Simulated mass transfer coefficients were compared to correlations from the literature. • The influence of emulsion phase concentration profiles on mass transfer was analyzed. • Effect of diffusion in Geldart A particle systems was underestimated by most existing correlations.

Abstract

A classical Euler–Lagrangian model for gas–solid flows was extended with gas component mass conservation equations and used to obtain fundamental insights into bubble-to-emulsion phase mass transfer in bubbling gas–solid fluidized beds. Simulations of injected single rising bubbles under incipient fluidization conditions were carried out, using Geldart-A and -B particles. Phenomena observed in the simulations and those of various theoretical models used to derive phenomenological models were compared to challenge the assumptions underlying the phenomenological models. The bubble-to-emulsion phase mass transfer coefficients calculated for the simulations using Geldart-B particles were in a good agreement with predictions made using the Davidson and Harrison (1963) model. The bubble-to-emulsion phase mass transfer coefficients for Geldart-A particles were, however, much smaller than the predictions obtained from theoretical models (e.g. Chiba and Kobayashi (1970)). The newly developed model allows a detailed analysis of various hydrodynamic aspects and their effects on the mass transfer characteristics in and around rising bubbles in fluidized beds.

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Keywords

Mass transfer; Discrete particle model; Fluidized bed; Bubble-to-emulsion