Hydrodynamic characteristics of two-phase inverse fluidized bed

1996 ◽  
Vol 15 (3) ◽  
pp. 159-164 ◽  
Author(s):  
N. Ulaganathan ◽  
K. Krishnaiah
Keyword(s):  
Fluidized Bed ◽  
Hydrodynamic Characteristics ◽  
Two Phase ◽  
Inverse Fluidized Bed

Hydrodynamic characteristics of bubble-induced three-phase inverse fluidized bed (BIFB)

2019 ◽  
Vol 209 ◽  
pp. 115177 ◽  
Author(s):  
Keying Ma ◽  
Xiliang Sun ◽  
Yuanyuan Shao ◽  
Mingyan Liu ◽  
Jesse Zhu
Keyword(s):  
Fluidized Bed ◽  
Hydrodynamic Characteristics ◽  
Three Phase ◽  
Inverse Fluidized Bed

Hydrodynamic characteristics of a three-phase inverse fluidized-bed column

AIChE Journal ◽  
1996 ◽  
Vol 42 (7) ◽  
pp. 1889-1900 ◽  
Author(s):  
Yasser A. A. Ibrahim ◽  
Cedric L. Briens ◽  
Argyrios Margaritis ◽  
Maurice A. Bergongnou
Keyword(s):  
Fluidized Bed ◽  
Hydrodynamic Characteristics ◽  
Three Phase ◽  
Inverse Fluidized Bed

scholarly journals A Simple Analytical Method for Determining Basic Hydrodynamic Characteristics of Hybrid Fluidized-Bed Air-Lift Apparatae

2017 ◽  
Vol 38 (1) ◽  
pp. 121-133
Author(s):  
Bolesław Tabiś ◽  
Dominika Boroń
Keyword(s):  
Fluidized Bed ◽  
Analytical Method ◽  
Solid Particles ◽  
Hydrodynamic Characteristics ◽  
Shear Forces ◽  
Two Phase ◽  
Forced Circulation ◽  
Simple Analytical Method ◽  
Airlift Bioreactors ◽  
Air Lift

Abstract A simple analytical method for determination of basic hydrodynamic characteristics of hybrid fluidized-bed air-lift devices was presented. These devices consist of two parts: a two-phase air-lift part and a two-phase liquid-solid fluidized-bed part. Forced circulation of fluid in the air-lift part is used for fluidization of solid particles in the fluidized-bed part. According to the opinion given in the literature, if such apparatus is used for aerobic microbiological processes, its advantage is lower shear forces acting on the biofilm immobilized on fine-grained material compared with shear forces in three-phase fluidized-bed bioreactors. Another advantage is higher biomass concentration due to its immobilization on fine particles, compared with two-phase airlift bioreactors. A method of calculating gas hold-up in the air-lift part, and gas and liquid velocities in all zones of the analyzed apparatus is presented.

Hydrodynamic Characteristics of a Novel Circulating Fluidized Bed Steam Reformer Operating in the Fast Fluidization Regime

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Moataz Bellah M. Mousa ◽  
Seif-Eddeen K. Fateen ◽  
Essam A. Ibrahim
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Numerical Approach ◽  
Hydrodynamic Characteristics ◽  
Two Phase ◽  
Radial Segregation ◽  
Fluidization Regime ◽  
Computational Fluid Dynamics Cfd ◽  
Model Equations ◽  
Steam Reformers

Circulating Fluidized Bed Steam Reformers (CFBSRs) represent an important alternative for the production of syngas for the Fisher-Tropsch (FT) process and for hydrogen production. Most research regarding this novel CFBSRs did not consider its hydrodynamic characteristics. In this work, the riser Computational Fluid Dynamics (CFD) simulations were investigated using two phase Eulerian-Eulerian approach coupled with kinetic theory of granular flow with k-epsilon model to describe the turbulence of each phase. The model equations were solved via the commercial CFD package FLUENT, which uses the finite volume numerical approach. Cold flow simulations were carried out under the fast fluidization regime and results were validated qualitatively against available experimental data. The radial segregation of the catalyst, the velocity distribution of both phases and other characteristics of the flow were captured by the simulation. This work showed that for operation under high density and high flux conditions, solids flux should be higher than 300 kg/m2s and inlet void fraction lower than 85%.

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