1. Effect of interparticle force on gas dynamics in a bubbling gas–solid fluidized bed: A CFD-DEM study
- Author
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Jamal Chaouki, S.M. Okhovat-Alavian, Hamid Reza Norouzi, Jaber Shabanian, Reza Zarghami, and Navid Mostoufi
- Subjects
Pressure drop ,Materials science ,business.industry ,General Chemical Engineering ,Bubble ,02 engineering and technology ,General Chemistry ,Mechanics ,Computational fluid dynamics ,021001 nanoscience & nanotechnology ,Discrete element method ,Physics::Fluid Dynamics ,020401 chemical engineering ,Fluidized bed ,Phase (matter) ,Emulsion ,0204 chemical engineering ,0210 nano-technology ,business ,CFD-DEM - Abstract
The influence of cohesive interparticle force (IPF) on gas dynamics in a bubbling gas–solid fluidized bed was numerically investigated while the bed hydrodynamics was described with the help of computational fluid dynamics and discrete element method (CFD-DEM). The model was validated by experimental results in terms of total bed pressure drop profile, probability density distribution of instantaneous local bed voidage signals, and Eulerian solid velocity field. The results showed that the model can satisfactorily predict the hydrodynamics of a bubbling gas–solid fluidized bed that is impacted by the presence of cohesive IPF. The validated CFD-DEM model was adopted to delineate the effects of IPF on the distribution of fluidizing gas between the bubble and emulsion phases and bubble characteristics, such as bubble stability and rise path, which could hardly be explored experimentally. Simulation results revealed that the presence of IPF in the bubbling bed alters the distribution of the fluidizing gas between the bubble and emulsion phases in favor of an increase in the propensity of gas to pass through the bed in the emulsion phase. The results also indicated that the bubble stability increases and the straight rise path of bubbles changes to a tortuous path when enhancing IPF.
- Published
- 2019
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