Multi‐dimensional model of a spouted bed

Krzywanski, R. S.; Epstein, Norman; Bowen, Bruce D.

doi:10.1002/cjce.5450700506

Cited by 34 publications

(10 citation statements)

References 45 publications

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“…It almost disappears for the highest gas flow rate but shows up in the fountain region as noted below. This shift has been predicted by Krzywanski (1992) and arises due to radial movement of particles and particle-particle collisions in the spout. From Figure 5 it is also noted that increasing gas flow causes the local particle velocity to increase throughout the entire spout.…”

Section: Particle Velocities In the Spoutsupporting

confidence: 54%

Particle velocity profiles and solid flow patterns in spouted beds

et al. 1994

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A fibre optic probe system was used to measure the profiles of vertical particle velocities in the spout and the fountain of a half‐column and a full‐column spouted bed. In addition, a fibre optic image probe was employed to measure vertical particle velocity profiles in the annulus of the full‐column. In the spout, radial profiles of vertical particle velocities were of near Gaussian distribution. Particle velocities along the spout axis in the half‐column were 30% lower than in the full‐column under identical operating conditions. In the half column, particle velocities adjacent to the front plate were approximately 24% lower than a few millimeters away. The fountain core expanded suddenly near the bed surface and then gradually contracted with height. The model of Grace and Mathur (1978) gave good predictions of fountain heights for the full‐column. In the annulus region, there was a 28% difference between particle velocities adjacent to the column wall and those only 2 mm away. The integrated upward solids mass flow in the spout and the downward solids flow in the annulus matched well at different bed levels.

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Section: Particle Velocities In the Spoutsupporting

confidence: 54%

Particle velocity profiles and solid flow patterns in spouted beds

et al. 1994

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“…The denser central zone is probably associated with radial movement of solid particles and particle-particle collisions in the spout. It is notable that a central denser zone was predicted for some conditions recently by Krzywanski (1992). The denser central zone also exists in the fountain region as one can see from Figure 6.…”

Section: Voidage Profiles In the Spoutmentioning

confidence: 52%

Measurements of voidage profiles in spouted beds

et al. 1994

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A fibre optic probe has been used to measure voidage profiles in the fountain, spout and annulus of spouted beds. The voidage in most of the annulus was found to be somewhat higher than the loose‐packed voidage and increased with increasing spouting gas flow rate, contrary to usual assumptions. There is a denser region in the annulus where the voidage was a little lower than the loose‐packed bed voidage. In the core of the fountain, the voidage decreased with height for low spouting gas flow rate, consistent with the model of Grace and Mathur (1978); however, at higher gas flow rate, it first increased with height and then decreased towards the fountain top. The radial profiles of local voidage were roughly parabolic in the lower portion of the spout and blunt in the upper portion.

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“…A modified model was employed by Day et al (1987) to predict axial variations of radially averaged voidage and particle velocity in the spout at minimum spouting conditions. Krzywanski et al (1992) developed a multi-dimensional model to describe the gas and particle dynamic behaviour in spouted beds. San José et al (1998) obtained the horizontal component of velocity and the trajectories of particles by solving the mass conservation equation in a conical spouted bed.…”

Section: Solid Momentum Equation Wherementioning

confidence: 99%

Numerical Simulations of the Effect of Conical Dimension on the Hydrodynamic Behaviour in Spouted Beds

Zhao

Bouillard

et al. 2004

Can J Chem Eng

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The flow behaviours of gas‐solids were predicted by means of a hydrodynamic model of dense gas‐solid flow in spouted beds. Constitutive equations describing the particulate solids pressure and viscosity were implemented into a hydrodynamic simulation computer program. The effect of operating conditions (inclined angle and gas spouting velocity) on particle velocity and concentration in the spout, annulus and fountain regions were numerical studied. Both vertical and horizontal particle velocities increased with increasing spouting gas velocity. The diameter of the spout increases with decreasing the inclination angle. As the inclination angle is set greater than 60°, the spout cross‐section starts becoming bottlenecked, limiting the upwards flow of solids.

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Multi‐dimensional model of a spouted bed

Cited by 34 publications

References 45 publications

Particle velocity profiles and solid flow patterns in spouted beds

Particle velocity profiles and solid flow patterns in spouted beds

Measurements of voidage profiles in spouted beds

Numerical Simulations of the Effect of Conical Dimension on the Hydrodynamic Behaviour in Spouted Beds

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