Dynamics of spiral bubble plume motion in the entrance region of bubble columns and three-phase fluidized beds using 3D ECT

2005 ◽  
Vol 60 (22) ◽  
pp. 6073-6084 ◽  
Author(s):  
W. Warsito ◽  
L.-S. Fan
Keyword(s):  
Fluidized Beds ◽  
Bubble Columns ◽  
Entrance Region ◽  
Bubble Plume ◽  
Three Phase

Effect of Gas Density on the Hydrodynamics of Bubble Columns and Three-Phase Fluidized Beds

2008 ◽  
Vol 81 (3-4) ◽  
pp. 846-852 ◽  
Author(s):  
Arturo Macchi ◽  
Hsiaotao Bi ◽  
John R. Grace ◽  
Craig A. McKnight ◽  
Larry Hackman
Keyword(s):  
Fluidized Beds ◽  
Bubble Columns ◽  
Gas Density ◽  
Three Phase

Gas-Liquid-Particle Three-Phase Flows in Bubble Columns

2003 ◽  
Author(s):  
Goodarz Ahmadi ◽  
Xinyu Zhang
Keyword(s):  
Computational Model ◽  
Oscillatory Behavior ◽  
Bubble Columns ◽  
Hard Sphere Model ◽  
Bubble Plume ◽  
Bubble Liquid ◽  
Three Phase ◽  
Three Phase Flow ◽  
Discrete Phase ◽  
Particle Velocities

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.

Effect of column inclination on the performance of three-phase fluidized beds

AIChE Journal ◽  
1992 ◽  
Vol 38 (8) ◽  
pp. 1206-1212 ◽  
Author(s):  
M. Del Pozo ◽  
C. L. Briens ◽  
G. Wild
Keyword(s):  
Fluidized Beds ◽  
Three Phase
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