CFD simulation of hydrodynamics of gas–liquid–solid three-phase bubble column

Li, Weiling; Wang, Zhong

doi:10.1016/j.powtec.2015.09.028

Cited by 58 publications

(26 citation statements)

References 30 publications

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“…Considering physical properties of the mixture and the attainable pump head, an incompressible flow was assumed. The flow was governed by Reynolds-averaged Navier-Stokes (RANS) equations [13][14][15]. The energy conservation equation was not taken into account, and the continuity equation takes the following form:…”

Section: Governing Equationsmentioning

confidence: 99%

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Kang

Teng

et al. 2019

Water

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High flexibility of prefabricated pumping stations in collecting and transporting storm water has been recognized. Nevertheless, flows inside such a complex system have rarely been reported. The present study aims to reveal water-sand flow characteristics in a prefabricated pumping station and to optimize geometric parameters of the tank to mitigate sand particle deposition. Five tank schemes, varying in the ratio of the diameter to the height of the tank bottom (D/L), were investigated. Flows in the pumping station were simulated using the computational fluid dynamics (CFD) technique. Test data were used to validate the numerical scheme. Three-dimensional water-sand flows in the pumping station were described. Underlying mechanisms of sand particle deposition were explained. The results indicate that the risk of deposition is high at the tank bottom side, close to the tank inlet. Both the tank bottom geometry and the inlet suction of the pump contribute to sand particle deposition. The averaged sand volume fraction at the pump inlet reaches its minimum at D/L = 3. Sand particle velocity at the pump inlet varies inversely with D/L. The highest intensity of the vortex at the pump inlet arises at D/L = 3. The best anti-deposition performance of the pumping station is attained at D/L = 3.

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Section: Governing Equationsmentioning

confidence: 99%

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Kang

Teng

et al. 2019

Water

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“…Other researches [16,17] have been done on the different interphase momentum exchanges between slurry bed and gasliquid bubbling bed. However, only few papers [14,[18][19][20] considered the influence of particles on hydrodynamics in slurry beds.…”

Section: Introductionmentioning

confidence: 99%

Population Balance Model Simulation of the Particle Effect on Flow Hydrodynamics in Slurry Beds

Shi

et al. 2019

Chem Eng & Technol

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Computational fluid dynamics (CFD) simulation can provide in‐depth knowledge on hydrodynamics in slurry‐bed reactors. The accuracy of CFD simulation is highly depending on the description of the interactions between gas phase and slurry phase with the drag model. Conventional drag models were usually developed for gas‐liquid systems without considering the presence of particles in slurry‐bed reactors. A modified drag model is proposed by taking into account the effect of particles. Simulation results proved the accuracy of the model in predicting hydrodynamics in the slurry bed. A higher particle concentration can increase the gas velocity and decrease the gas holdup due to the lower drag force between gas phase and slurry phase. The bubble size is predicted to be larger at higher particle concentrations due to the increased liquid eddy length scale. Considering the particle effect is critical for accurately simulating slurry‐bed reactors.

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“…Gamwo et al [20] reported on a model of a chemically active threephase slurry reactor for methanol synthesis. Li and Zhong [21] studied the gas-liquid-solid three-phase ow in bubble columns using a three-dimensional timedependent Eulerian-Eulerian-Eulerian three-uid approach. Bogner et al [22] performed a direct numerical simulation of liquid-gas-solid ows with a free surface Lattice Boltzmann method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations on Gas-Liquid-Particle Flows in Three-Phase Slurry Reactors under gravity variation

Zhang

Ahmadi

2018

Scientia Iranica

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Numerical simulations of three-phase gas-liquid-particle ows under 1 g and 2 g gravitational conditions were performed with an Eulerian-Lagrangian method. In this study, the liquid was treated as a continuous phase and modeled by a volume-averaged system of governing equations. Bubbles and particles were modeled as discrete phases using Lagrangian method. Drag, lift, buoyancy, and virtual mass forces were included in the Lagrangian equation. Bubbles were treated as spherical without shape variations. The two-way coupling between bubble-liquid and particle-liquid was included, and interactions between bubble-bubble and particle-particle were considered with the hard sphere model. Particle-bubble interactions and bubble coalescences were also included in the analysis. The results under 1 g normal gravity condition were compared with the available experimental data in earlier simulation, resulting in good agreement. The transient ow characteristics of the three-phase ow under 1 g and 2 g gravitational conditions were studied, and the e ects of gravity were analyzed. The results show that gravity has magni cent e ect on the ow characteristics of three-phase gas-liquid-particle ows in bubble columns. The three-phase velocities under higher gravity are larger than those of the ow under normal gravity are. The ow under higher gravity develops fast. Bubbles and bubble volume fraction in the higher gravity ow are smaller.

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CFD simulation of hydrodynamics of gas–liquid–solid three-phase bubble column

Cited by 58 publications

References 30 publications

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Population Balance Model Simulation of the Particle Effect on Flow Hydrodynamics in Slurry Beds

Numerical Simulations on Gas-Liquid-Particle Flows in Three-Phase Slurry Reactors under gravity variation

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