Flow characteristics of the liquid–solid circulating fluidized bed

Wang, Liang; Zhang, Shuliang; Zhu, Jesse; Ye, Jin; Yu, Z.M.; Wang, Zhanwen

doi:10.1016/s0032-5910(96)03198-1

Cited by 112 publications

(94 citation statements)

References 10 publications

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“…In the developing flow region, located at the lower portion of the riser, solid acceleration along with a decrease in holdup was evident. At higher total velocity, solid holdup plateaus, which indicates that the solid flow enters into the fully developed zone, and was consistent to the results reported in earlier studies (Liang et al, 1997;Zheng et al, 1999;Vidyasagar et al, 2009). …”

Section: Average Solid Holdupsupporting

confidence: 91%

“…It is noted that there exists a similar flow structure in the axial distribution of solid holdup at every section of the riser, for the given primary velocity. Vidyasagar et al, (2009), Zheng et al, (1999, Liang et al, (1997) have also reported a similar axial distribution along the riser. An increase in axial solid holdup, with increase in auxiliary velocity can also be observed, suggesting high significance of the non-mechanical valve combination, with respect to the amount of solids held up axially in the riser.…”

Section: Axial Solid Holdupmentioning

confidence: 65%

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Effect of Liquid Viscosity and Solid Inventory on Hydrodynamics in a Liquid - solid Circulating Fluidized Bed

Sundaram

Venugopal²,

Ullas

et al. 2017

JAFM

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A comprehensive hydrodynamic study of a Liquid -Solid Circulating Fluidized Bed (LSCFB) is conducted with changes in viscosity of the fluidizing medium and the inventory height of solids initially fed into the system. An LSCFB of height 2.95m and riser outer diameter 0.1m was chosen for experimentation. The three liquid media systems with varying viscosities that were chosen were water, glycerol 10% (v/v) and glycerol 20% (v/v). Effect of inventory on the hydrodynamics was also studied, by taking initial heights of inventory to be 15cm, 25cm and 35cm. The hydrodynamic studies concentrated on pressure gradients along the axial pressure tapings, axial solid holdup, average solid holdup, solid circulation rate and slip velocity. Uniformity in axial solid holdup and average solid holdup was validated for changes in viscosity and inventory. Solid flux was seen to follow an inverse relationship to holdup. The changes in slip velocity with varying viscosity and inventory were studied, and found to decrease with both variables. The distribution parameter, Co of the drift flux model was found to be in the range of 0.983-0.994, suggesting non-uniformity in radial solid distribution, with higher solid concentration by the walls compared to the core of the column.

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Section: Average Solid Holdupsupporting

confidence: 91%

Section: Axial Solid Holdupmentioning

confidence: 65%

Effect of Liquid Viscosity and Solid Inventory on Hydrodynamics in a Liquid - solid Circulating Fluidized Bed

Sundaram

Venugopal²,

Ullas

et al. 2017

JAFM

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“…Ž . ported by Liang et al 1997 andZheng et al 1999 . Figure 5 shows the influence of the superficial liquid veloc-Ž .…”

Section: Resultsmentioning

confidence: 99%

Continuous protein recovery with a liquid–solid circulating fluidized‐bed ion exchanger

et al. 2002

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“…Correlation (21) is developed for conventional liquid-solid fluidization systems, in which the particles are in a uniformly suspended state, the liquid velocity and bed voidage distributions are homogeneous in both the axial and the radial directions. Therefore, it may not be applicable for circulating fluidization due to the non-uniform flow structure [34].…”

Section: Generalization Of Force Equilibrium Correlationsmentioning

confidence: 99%

A generalized correlation for equilibrium of forces in liquid–solid fluidized beds

Yang

Renken

2003

Chemical Engineering Journal

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Following a critical publication review on the expansion of fluidized bed with the fluid velocity, the well-known Richardson-Zaki equation is applied to develop a more accurate relationship linking the apparent drag force F d , the effective gravitational force F g and the voidage of fluidized beds under intermediate regime. A correcting constant a in the relationship is a function of Archimedes number which may provide a degree of flexibility for different systems covering a wide range of variables. With addition of the correlation developed in this work, equivalence correlations between equilibrium forces and the Richardson-Zaki equation can be found for a whole regime.

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Flow characteristics of the liquid–solid circulating fluidized bed

Cited by 112 publications

References 10 publications

Effect of Liquid Viscosity and Solid Inventory on Hydrodynamics in a Liquid - solid Circulating Fluidized Bed

Effect of Liquid Viscosity and Solid Inventory on Hydrodynamics in a Liquid - solid Circulating Fluidized Bed

Continuous protein recovery with a liquid–solid circulating fluidized‐bed ion exchanger

A generalized correlation for equilibrium of forces in liquid–solid fluidized beds

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