Discrete particle simulations of bubble-to-emulsion phase mass transfer in single-bubble fluidized beds--颗粒学报PARTICUOLOGY

Tan, L., Roghair, I., & van Sint Annaland, M. (2017). Discrete particle simulations of bubble-to-emulsion phase mass transfer in single-bubble fluidized beds. Particuology, 33, 80-90. https://doi.org/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 ^*

Chemical Process Intensification, Multiphase Reactors Group, Department of Chemical Engineering & Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

10.1016/j.partic.2016.09.008

Volume 33, August 2017, Pages 80-90

Received 4 July 2016, Revised 22 August 2016, Accepted 8 September 2016, Available online 6 February 2017, Version of Record 13 June 2017.

E-mail: 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.

Graphical abstract

Keywords

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

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