Bubble Splitting in a Pseudo-2D Gas-Solid Fluidized Bed for Geldart B-Type Particles

2014 ◽  
Vol 37 (12) ◽  
pp. 2096-2102 ◽  
Author(s):  
Salman Movahedirad ◽  
Asghar Molaei Dehkordi ◽  
Esmaeel Abbaszade Molaei ◽  
Mehdi Haghi ◽  
Mohammad Banaei ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Bubble Splitting

scholarly journals Effect of particle shape on bubble dynamics in bubbling fluidized bed

2021 ◽  
Vol 249 ◽  
pp. 06012
Author(s):  
Siddhartha Shrestha ◽  
Zongyan Zhou
Keyword(s):  
Fluidized Bed ◽  
Bubble Size ◽  
Particle Shape ◽  
Bubble Dynamics ◽  
Bubble Velocity ◽  
Aspect Ratios ◽  
Bubbling Fluidized Bed ◽  
Single Jet ◽  
Bubble Splitting ◽  
Good Agreement

Particle shape can significantly affect the bubble dynamics of bubbling fluidized beds (BFB). In this paper, findings obtained from simulations using CFD-DEM are summarized to discuss the effect of particle shape on bubble dynamics and bubble properties such as bubble size, shape and velocity at a single orifice and uniform fluidized bed. Particles with aspect ratios at 0.5 (oblate), 1 (spherical) and 2 (prolate) are employed to represent disc-like, spherical and rod-like particles, respectively. Both single jet and uniform fluidized bed simulations demonstrate that the bubble forming/rising regions, bubble coalescence locations, and bubble splitting phenomena are significantly influenced by particle shape. The CFD-DEM results for bubble size and bubble velocity show good agreement with literature correlations.

3-D Modeling of Liquid Injection into Fluidized Beds

2004 ◽  
Vol 2 (1) ◽  
Author(s):  
Joachim Werther ◽  
Stefan Bruhns
Keyword(s):  
Fluidized Bed ◽  
Flow Structure ◽  
Three Dimensional ◽  
Fluidized Bed Reactors ◽  
Three Dimensional Model ◽  
Liquid Injection ◽  
Bubbling Fluidized Bed ◽  
Solids Mixing ◽  
Semi Empirical ◽  
Bubble Splitting

A three-dimensional model has been developed to describe the injection of liquid reactants into fluidized bed reactors operating in the bubbling fluidized bed regime. The model considers the processes of liquid transport and evaporation in the vicinity of the point of injection. The underlying idea, which is supported by previous measurements, is that the particles in the dense suspension phase are wetted by the liquid or gas-liquid spray. The wetted particles are subsequently dried while they are following the gross solids circulation within the bed. The model considers the flow structure of the bubbling fluidized bed and the solids mixing with the aid of a hybrid model which combines semi-empirical models for bubble growth by coalescence and for bubble splitting with a CFD approach for the continuous emulsion phase surrounding the bubbles. Submodels for heat and mass transfer are used to describe the temperature and concentration fields in the vicinity of the injection nozzle and the drying process of the wetted particles with the resulting release of the vaporized injection liquid. The model was validated separately against flow structure measurements, solids tracer measurements and experiments with the injection of water and ethanol, respectively, into beds of FCC particles.

Modeling of Solid Fuel Combustion in Furnaces with a Circulating Fluidized Bed

2008 ◽  
Vol 39 (1) ◽  
pp. 65-78
Author(s):  
Yu. S. Teplitskii ◽  
V. A. Borodulya ◽  
V. I. Kovenskii ◽  
E. P. Nogotov
Keyword(s):  
Fluidized Bed ◽  
Solid Fuel ◽  
Circulating Fluidized Bed ◽  
Fuel Combustion ◽  
Solid Fuel Combustion
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