TY - GEN

T1 - Gas-liquid-particle three-phase flows in bubble columns

AU - Ahmadi, Goodarz

AU - Zhang, Xinyu

N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2003

Y1 - 2003

N2 - An Eulerian-Lagrangian computational model for simulations of gas-liquid-solid flows in three-phase slurry reactors is developed. In this approach, the liquid flow is modeled using a volume-averaged system of governing equations, whereas motions of bubbles and particles are evaluated by Lagrangian trajectory analysis procedure. It is assumed that the bubbles remain spherical and their shape variations are neglected. The two-way interactions between bubble-liquid and particle-liquid are included in the analysis. The discrete phase equations include drag, lift, buoyancy, and virtual mass forces. Particle-particle interactions are accounted for by the hard sphere model approach. The bubble collisions and coalescence are also included in the computational model. The simulation results show that the transient characteristics of the three-phase flow in a column are dominated by time-dependent staggered vortices. The bubble plume moves along a S-shape path and exhibit an oscillatory behavior. While most particles are located outside the vortices, some bubbles and particles are retained in the vortices. Bubble upward velocities are much larger than both liquid and particle velocities. Particle upward velocities are slightly smaller than the liquid velocities.

AB - An Eulerian-Lagrangian computational model for simulations of gas-liquid-solid flows in three-phase slurry reactors is developed. In this approach, the liquid flow is modeled using a volume-averaged system of governing equations, whereas motions of bubbles and particles are evaluated by Lagrangian trajectory analysis procedure. It is assumed that the bubbles remain spherical and their shape variations are neglected. The two-way interactions between bubble-liquid and particle-liquid are included in the analysis. The discrete phase equations include drag, lift, buoyancy, and virtual mass forces. Particle-particle interactions are accounted for by the hard sphere model approach. The bubble collisions and coalescence are also included in the computational model. The simulation results show that the transient characteristics of the three-phase flow in a column are dominated by time-dependent staggered vortices. The bubble plume moves along a S-shape path and exhibit an oscillatory behavior. While most particles are located outside the vortices, some bubbles and particles are retained in the vortices. Bubble upward velocities are much larger than both liquid and particle velocities. Particle upward velocities are slightly smaller than the liquid velocities.

KW - Eulerian-Lagrangian Method

KW - Gas-Liquid-Particle

KW - Numerical Simulation

KW - Three-Phase

UR - http://www.scopus.com/inward/record.url?scp=0346903375&partnerID=8YFLogxK

U2 - 10.1115/fedsm2003-45556

DO - 10.1115/fedsm2003-45556

M3 - Conference contribution

AN - SCOPUS:0346903375

SN - 0791836967

SN - 9780791836965

T3 - Proceedings of the ASME/JSME Joint Fluids Engineering Conference

SP - 1781

EP - 1785

BT - Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference

A2 - Ogut, A.

A2 - Tsuji, Y.

A2 - Kawahashi, M.

PB - American Society of Mechanical Engineers

T2 - 4th ASME/JSME Joint Fluids Engineering Conference

Y2 - 6 July 2003 through 10 July 2003

ER -