CFD simulation of a slurry bubble column: effect of population balance kernels. (English) Zbl 1410.76304
Summary: In this work, CFD simulations of a slurry bubble columns were performed and validated with experimental data. The superficial gas velocities investigated in the experiments were 5 and 8cm/s for a solid loading varying from 7% to 14% in a 0.14m to 0.26m internal diameter column. A population balance model (PBM) is implemented and solved numerically using the bubble class method. The closure kernels involve Luo’s coalescence model as well as two different breakup models: Luo’s and Lehr’s models. The kinetic theory of granular flows (KTGF) was used to calculate the local solid viscosity. The Eulerian framework was selected for multi-phase calculations and the interphase momentum transfer for gas-liquid included drag, lift, and turbulent dispersion terms. The liquid-solid interphase involved both drag and turbulent dispersion terms. Results showed that: (a) a combination of the Luo coalescence and Luo breakup kernels (Luo-Luo) can predict similar trends for the radial profile of solid axial velocity with regards to experiments. However, at the highest superficial gas velocity in the small column, a discrepancy was observed in the results. (b) A combination of the Luo coalescence and Lehr breakup kernels (Luo-Lehr) predicted similar trends for the solid velocities when compared to empirical data, however, this combination also showed discrepancy at the highest superficial velocity tested in the small column. (c) The total gas holdup in the Luo-Luo and Luo-Lehr models are under and over predicted, respectively, when compared with the experimental results. (d) The mesh sensitivity results showed that a 3mm mesh size is realistic to capture the flow fields. (e) The sensitivity analysis of the number of bubble classes showed that the radial profiles were independent to a number of bubble classes. However, the highest number of classes cover the formations of the largest bubbles.
MSC:
| 76M20 | Finite difference methods applied to problems in fluid mechanics |
| 65M06 | Finite difference methods for initial value and initial-boundary value problems involving PDEs |
| 76T10 | Liquid-gas two-phase flows, bubbly flows |
Keywords:
population balance model (PBM); bubble size distribution; kinetic theory of granular flows model (KTGF); time-average radial profiles of holdup and axial solid velocity; bed expansion; slurry bubble columnReferences:
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