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Partic. vol. 35 pp. 51-67 (December 2017)
doi: 10.1016/j.partic.2016.10.008

Counter-current three-phase fluidization in a turbulent contact absorber: A CFD simulation

Syed Shah Jehan Gillani, Atta Ullah*, Muhammad Zaman, Imran Rafique Chugtai, Mansoor Hameed Inayat

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atta@pieas.edu.pk

Highlights

    • Multi-fluid Eulerian simulations of a three-phase turbulent contact absorber were performed. • Cell size required for grid independency was much smaller than the particle size used. • Results of simulations agreed with experimental data for low to medium liquid and gas velocities.

Abstract

A computational fluid dynamics study of three-phase counter-current fluidization occurring in a turbulent contact absorber was performed. A two-dimensional, transient Eulerian multi-fluid model was used, in which the dispersed solid phase was modeled employing a kinetic theory of granular flow. The grid independence of the model, the effect of wall boundary conditions, the choice of granular temperature model, the effects of order of discretization scheme and drag models were studied for a base case setting. The results of simulations were validated against experimental results obtained from the literature. Once the model settings were finalized, simulations were performed for different gas and liquid velocities to predict the hydrodynamics of the absorber. Computed bed expansion and pressure drop were compared with experimental data. Good agreement between the two was found for low velocities of gas and liquid.

Graphical abstract

Keywords

Multiphase; Counter-current; Computational fluid dynamics (CFD); Fluidization; Turbulent contact absorber