Fluid dynamics of gas-liquid-solid fluidized beds

1986 ◽  
Vol 25 (4) ◽  
pp. 849-854 ◽  
Author(s):  
Enrique Costa ◽  
Antonio De Lucas ◽  
Pedro Garcia
Keyword(s):  
Fluid Dynamics ◽  
Fluidized Beds

Inlet boundary conditions for the simulation of fluid dynamics in gas–solid fluidized beds

2006 ◽  
Vol 61 (16) ◽  
pp. 5183-5195 ◽  
Author(s):  
Srdjan Sasic ◽  
Filip Johnsson ◽  
Bo Leckner
Keyword(s):  
Fluid Dynamics ◽  
Boundary Conditions ◽  
Fluidized Beds

scholarly journals Detailed computational and experimental fluid dynamics of fluidized beds

2006 ◽  
Vol 30 (11) ◽  
pp. 1459-1471 ◽  
Author(s):  
N.G. Deen ◽  
M. Van Sint Annaland ◽  
J.A.M. Kuipers
Keyword(s):  
Fluid Dynamics ◽  
Fluidized Beds ◽  
Experimental Fluid Dynamics ◽  
Experimental Fluid

Prediction of the Flotsam Component in a Gas-Fluidized Bed of Two Dissimilar Solids

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Alberto Di Renzo ◽  
Francesco P. Di Maio ◽  
Vincenzino Vivacqua
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Computational Fluid Dynamics ◽  
Simple Model ◽  
Discrete Element Method ◽  
Fluidized Bed ◽  
Fluidized Beds ◽  
Computational Simulations ◽  
The Difference ◽  
Gas Fluidized Beds

In the present paper the segregating behaviour of solids of different size and density in gas-fluidized beds is studied. In particular, the attention is focussed on pairs composed of a bigger/less dense species and a smaller/denser species. Typical industrial examples of such combinations are encountered in fluidized beds of biomass/sand mixtures. Their behaviour is not easily predictable, as the segregation tendency promoted by the difference in density is counteracted by the difference in size. While typically the denser component is expected to appear predominantly at the bottom of the fluidized bed, experiments on mixtures exhibiting the reverse behaviour have been reported (e.g. Chiba et al., 1980).A simple model to predict the segregation direction of the components, i.e. which species will segregate to the top of the bed (the flotsam), depending upon their difference in properties (size, density) and the mixture composition, is discussed. The predicted behaviour is compared with experimental data available in the literature and agreement is found for the majority of them. For one mixture, experiments are conducted as well as computational simulations based on the combined Discrete Element Method and Computational Fluid Dynamics (DEM-CFD) approach. This allows investigating how an initially mixed bed upon suspension evolves as a result of the segregation prevalence in the bed.

scholarly journals A CFD ANALYSIS OF THE INFLUENCE OF PLENUM CONFIGURATIONS ON GAS DISTRIBUTION IN A FLUIDIZED BED

2020 ◽  
Vol 50 (2) ◽  
pp. 83-88
Author(s):  
JOSE MIGUEL SORIA ◽  
TATIANA MARIEL AUSINA ◽  
GERMAN DELFOR MAZZA
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluidized Beds ◽  
Flow Distribution ◽  
Poor Quality ◽  
Cfd Analysis ◽  
Gas Distribution ◽  
Flow Uniformity ◽  
Computational Fluid Dynamics Cfd

Fluidized beds are widely used in many industries. The fluidization quality of these units is strongly related to the characteristics of the plenum and distributor (grid). In this work, the effect of different plenum geometries, and gas entrance sizes and locations on the velocity profile above the distributor was analyzed by Computational Fluid Dynamics (CFD). The results showed that flow uniformity above the distributor improved with an increase in the gas inlet diameter and the plenum height. Channeling was observed for the bottom central inlet. Additionally, simulations for plenum heights predicted by one of the frequently used correlations (Litz correlation) were also carried out and showed, especially for a bottom central gas inlet, a poor quality flow distribution. This behavior indicated that Litz correlation tends to underestimate the plenum height for obtaining a uniform flow downstream the distributor.

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