Effect of Particle Diameter and Apparent Particle Density on Internal Solid Circulation Rate in Air-Spouted Beds

Chatterjee, Amitava

doi:10.1021/i260036a006

Cited by 20 publications

(4 citation statements)

References 4 publications

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“…Comparing run conditions 1 and 4, the circulation rate at the top of the bed is essentially proportional to U / U m S . This is an agreement with the correlation of Chatterjee (1970) although the present range of variation is obviously very narrow. The absolute rates are roughly 33% higher than those measured by Chatterjee (1970) with colour tracer displacement technique for approximately equivalent values of particle size, density and column diameter.…”

Section: Implied Particle Circulation Ratessupporting

confidence: 91%

Measurement of particle movement in a spouted bed using a new microprocessor based technique

Waldie¹,

Wilkinson²

1986

Can J Chem Eng

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A new experimental technique for measuring particle cycle times, times of occurrence of particles at different levels, and particle velocities in the spout of a spouted bed is described. A magnetized marker particle and search coil or coils are employed together with a microprocessor system for ease of data collection and processing. The magnetic particles have the same diameter, density and similar surface texture to bed particles to ensure proper representation.Data is presented on distributions of cycle time and particle velocity and implied particle mass circulation rates at different levels in a spouted bed. Comparisons are made with photographic and laser-doppler anemometry techniques.On dCcrit une nouvelle technique expkrimentale pour mesurer la duree du cycle des particules, les temps d'apparition des particules ti diffkrentes hauteurs et la vitesse des particules dans le bec d'un lit << spoute B. On utilise une particule d'un marqueur magnktique, une ou des bobines de repkrage, un systeme de microprocesseur pour faciliter I'acquisition et le traitement des donnees. Les particules magnetiques ont le m h e diametre, la m h e densite et la mkme texture de surface que les particules du lit afin d'assurer une reprksentation juste.On prksente des donnkes sur les distributions des durees de cycle et les vitesses des particules et des donnies calculees de debits massiques de particules a diffkrentes niveaux dans le lit <( spout6 >>. Des comparaisons sont Ctablies avec les techniques d'anCmomCtrie laser-doppler et des techniques photographiques.

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Section: Implied Particle Circulation Ratessupporting

confidence: 91%

Measurement of particle movement in a spouted bed using a new microprocessor based technique

Waldie¹,

Wilkinson²

1986

Can J Chem Eng

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“…is the least rigorously handled aspect of the present model and requires further improvement. Table 4 also contains values of W,, determined from the empirical equation of Chatterjee (1970), and from the empirical plus one-dimensional theoretical equations of Day (1990). The Day values listed are taken from his 1990 communication, except for data sets 12 and 14, which were calculated from Day's (1990) Equation (3) Day's flat-bottom shallow beds, but do somewhat better than the present model for the non-spherical particles in Lim's cone-bottom beds.…”

Section: Resultsmentioning

confidence: 99%

Multi‐dimensional model of a spouted bed

1992

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A multi‐dimensional model is developed to describe the fluid and particle dynamic behaviour of spouted beds. The position of the spout‐annulus interface is determined by a variational analysis. Two‐fluid equations are used to represent gas and solids motions in the spout while the vector Ergun equation and soil mechanics equations are employed to describe, respectively, gas and solids behaviour in the annulus. Using numerical finite difference methods, the set of governing equations is solved subject to carefully chosen boundary conditions. The model predictions of key hydrodynamic characteristics are in reasonable agreement with available measured data selected from the literature to represent a wide range of experimental conditions.

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“…For the particle circulation behavior of spouted bed, much research has been carried out. Chatterjee et al conducted an experiment to explore the effects of particle diameter and apparent particle density on the internal solid circulation rate in an air-spouted bed. Berruti et al experimentally studied the effects of operating and geometry parameters on the solids circulation rates at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Particle Dispersion and Circulation Patterns in a 3D Spouted Bed with or without Draft Tube

Luo

Yang

Zhang

et al. 2013

Ind. Eng. Chem. Res.

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Solid dispersion and circulation properties in a 3D spouted bed with or without a draft tube are reported based on the CFD-DEM coupling approach. The distribution characteristics of the local and global solid dispersion coefficients are studied. Meanwhile, the effects of tube configuration and bed diameter on these two aspects are investigated. The results show that the large lateral dispersion coefficient concentrates in the spout−annulus interface and the lower part of the fountain region, while the vertical one lies in the central region of the spout. Insertion of a draft tube results in not only large systematic vertical and lateral dispersion coefficients but also more regular particle circulation patterns in the lateral and vertical directions. Furthermore, the larger the entrainment distance of the draft tube, the higher the local and systematic dispersion coefficients are and also an increasing particle circulation rate appears. Extension of the draft tube above the bed surface leads to a larger particle circulation rate and more vigorous dispersion system. With the scale-up of apparatus, both the lateral and the vertical dispersion coefficients are enhanced and solid circulation becomes more energetic.

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Effect of Particle Diameter and Apparent Particle Density on Internal Solid Circulation Rate in Air-Spouted Beds

Cited by 20 publications

References 4 publications

Measurement of particle movement in a spouted bed using a new microprocessor based technique

Measurement of particle movement in a spouted bed using a new microprocessor based technique

Multi‐dimensional model of a spouted bed

Particle Dispersion and Circulation Patterns in a 3D Spouted Bed with or without Draft Tube

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