A CFD study is carried out to investigate the roles of neutrally buoyant particles in gas-liquid-solid flows in bubble columns. An Eulerian-Lagrangian model is used and the liquid flow is modeled using a volume-averaged system of governing equations, while motions of bubbles and particles are evaluated using Lagrangian trajectory analysis. Bubbles are assumed to remain spherical. Bubble-liquid interaction and particle-liquid interaction are included in the study. The drag, lift, buoyancy, and virtual mass forces are included in the discrete phase equations. Particle-particle interactions and bubble-bubble interactions are accounted for by a hard sphere model. The bubble coalescence is also included in the analysis. Neutrally buoyant particles are used in the study. The predicted results were compared with the experimental data in a previous work, and good agreement was obtained. The transient flow characteristics of a gas-liquid-solid three-phase flow and a gas-liquid two-phase flow are studied and the roles of neutrally buoyant particles are discussed. The simulations show that the transient characteristics of the flows in a bubble column are dominated by time-dependent vortices. The presence of particles can affect the characteristics of the flows and flows with particles evolve faster.
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ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
July 8–12, 2012
Rio Grande, Puerto Rico, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4475-5
PROCEEDINGS PAPER
Roles of Neutrally Buoyant Particles in Gas-Liquid-Solid Flows
Goodarz Ahmadi
Goodarz Ahmadi
Clarkson University, Potsdam, NY
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Xinyu Zhang
Clarkson University, Potsdam, NY
Goodarz Ahmadi
Clarkson University, Potsdam, NY
Paper No:
FEDSM2012-72038, pp. 579-585; 7 pages
Published Online:
July 24, 2013
Citation
Zhang, X, & Ahmadi, G. "Roles of Neutrally Buoyant Particles in Gas-Liquid-Solid Flows." Proceedings of the ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1: Symposia, Parts A and B. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 579-585. ASME. https://doi.org/10.1115/FEDSM2012-72038
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