Numerical Simulation of Particle Segregation in Vibration Fluidized Beds

A modified model coupled with the population balance equation has been developed to simulate the aggregation process in fluidized beds. The population balance equation is solved as part of computational fluid dynamics simulation by the direct quadrature method of moments. In the simulation, the aggregation rate is controlled by the aggregation kernel which is usually obtained by theoretical derivation and is difficult to verify experimentally. The aggregation kernel is investigated by the discrete element method and the performance of the proposed model for simulating cohesive particle flow in fluidized beds is evaluated. Simulation results are compared to the experimental data and show good agreement. A comparison between different models is also carried out.

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“…Some small agglomerates are still fluidized in the top region. This phenomenon agrees well with our earlier study 32.…”

Section: Simulation and Discussionsupporting

confidence: 94%

Investigation of Aggregation Kernel and Simulation of Cohesive Particle Flow

Sun

Hassan

et al. 2016

Chem Eng & Technol

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“…Simulation results are in good agreement with experimental data except for the bottom area due to the effect of the solid inlet. The phenomenon of segregation based on size differences is observed in the riser with cohesive particles [30,31]. Two kinds of bed materials, CaCO 3 and TiO 2 , are used for simulation.…”

Section: Resultsmentioning

confidence: 99%

Population Balance Equation of Cohesive Particle Flow in a Circulating Fluidized Bed

2017

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A novel model coupled with a population balance equation is adopted for simulating the aggregation process and flow behavior of cohesive powders in a full-loop circulating fluidized bed. The agglomerate diameter is calculated according to the change of particle number by a population balance equation which is solved as a part of computational fluid dynamics simulation. The solid pressure and viscosity are redefined by taking the effect of interparticle force into consideration based on the kinetic theory of granular flow. Simulation results of time-averaged solid volume fraction and diameter of agglomerate are predicted by a numerical method and are in reasonable agreement with experimental data. The variation of mass flux, solid pressure, and viscosity under different operating conditions are analyzed based on the proposed model.

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“…Existing experimental studies in VFBs are mainly focused on beds operated in bubbling regime. These works include studies on the effect that vibration has on the bed and bubble dynamics [1,5], the air pressure and void fraction fluctuations induced by vibration [26][27][28][29][30] and the aggregation [28,31] and segregation phenomena [3,18,[32][33][34]. Some works have also investigated the effect of vibration on the bubble behavior in VFBs [8,10,11].…”

Section: Introductionmentioning

confidence: 99%