Hydrodynamics of gas–solid fluidization of a homogeneous ternary mixture in a conical bed: Prediction of bed expansion and bed fluctuation ratios

Dora, D.T.K.; Panda, Siddhant; Mohanty, Y. K.; Roy, Gour Gopal

doi:10.1016/j.partic.2013.02.009

Cited by 17 publications

(3 citation statements)

References 8 publications

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“…and induced PE particles entrainment. The reason is that the variables, such as the initial static bed height, particle diameter, and gas velocity, affect the bed expansion and fluctuation during the fluidization process [62]. In the particle breakage process, the decrease of polymer particle size could cause the obvious changes in operating state and bed expansion height shown in Figure 11c.…”

Section: Effect Of Particle Kinetics On the Particle Size Distributiomentioning

confidence: 99%

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

et al. 2015

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Section: Effect Of Particle Kinetics On the Particle Size Distributiomentioning

confidence: 99%

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

et al. 2015

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“…An increase in the bed expansion ratio of regular particles in the tapered fluidized bed is noticed upon a reduction in the apex angle and an increase in the superficial gas velocity; this has been reported (and confirmed) in the literature. [ 45,62–65 ]…”

Section: Resultsmentioning

confidence: 99%

Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

2022

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A two-dimensional gas-solid tapered fluidized bed at laboratory-scale in a homogenous fluidization regime is simulated using the computational fluid dynamics (CFD) software COMSOL 5.4. The Eulerian-Eulerian (EE) hydrodynamic model is used to predict the minimum fluidization velocity, minimum bubbling velocity, bed height, and solid volume fraction of alumina particles (in Geldart Group A) in the bed with different tapered angles.The effects of static bed heights on the minimum fluidization velocity of tapered beds are investigated. The highest minimum fluidization velocity is 6 mm/s with a static height of 11 mm and a tapered angle of 12 . The bed height is increased with increasing superficial air velocity. At a given air velocity, the minimum bed height is obtained at a 12 tapered angle. A decrease in solid volume fraction is also observed upon an increase in the superficial air velocity. The CFD results show an almost uniform solid concentration over the bed height. The homogenous or non-bubbling regime appears in a wider range of critical velocity at a 12 tapered angle. In the case of a 0 tapered angle, the results of this study and the discrete element method computational fluid dynamics (DEM-CFD) simulation exhibit a good match. In the case of 6 and 12 tapered angles, the proposed model leads to good predictions based on the theory of homogenous fluidization of Geldart Group A. This research introduces a rapid and cost-effective approach for the better design and operation of a tapered fluidized bed in large scales.

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“…It is observed that the adjusted Tune et al model gave a superior assention than the changed Zhang et al model in examination with the current exploratory information. Dora et al (2013) decided the hydrodynamic qualities of fluidization in a tapered couch incorporate the base fluidization speed, cot variance, and bunk extension degrees. The reliance of these amounts on a normal molecule measurement, mass division of the fines in the mixture, introductory static cot tallness, and cone edge is examined.…”

Section: Introductionmentioning

confidence: 99%

Conical Fluidized Bed with Arc Design for Improved Performance of Gas Distributor

Hamawand

Silva

Jawad

2015

SET

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Particles distributions along a conical fluidized bed were predicted by an alternative arrangement of the minimum fluidization velocity equation. The proposed approach introduces two new equations which present the particle diameter in the bed as function of: height in the bed (Z), angle of inclination of the fluidized bed wall (θ), input flow rate (Q o ), and gas distributor diameter (D o , 2r o ). A novel arc-shaped design of the gas distributor was suggested, which provides enhanced distribution of the gas and enables greater control on the direction of the gas inlet. The model showed that the inclination of the fluidized bed wall should not exceed a critical angle, which can be determined with the set of equations specially developed for this purpose, to prevent inhomogeneous fluidization across the bed and accumulation of particles along the walls.By applying the Box Wilson Method, theoretical data were obtained for constant column diameter at the base (0.05 m), and varying bed height, Z, (range: 0.5 to 1.5 m), velocity of gas inlet, U, (range 0.25 to 1 m s -1 ), and balance factor, a, (range: 0.5 to 1, a new factor), respectively. The angle of inclination of the wall was first predicted based on the above parameters, and subsequently, the particle size distribution along the column was determined. Theoretically the novel arc-shaped distributor design has shown the potential of generating homogeneous fluidization regimes along the bed.

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Hydrodynamics of gas–solid fluidization of a homogeneous ternary mixture in a conical bed: Prediction of bed expansion and bed fluctuation ratios

Cited by 17 publications

References 8 publications

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

Conical Fluidized Bed with Arc Design for Improved Performance of Gas Distributor

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