Velocity-Voidage Relationships for Fluidization and Sedimentation in Solid-Liquid Systems

Garside, J.; Al-Dibouni, Maan R.

doi:10.1021/i260062a008

Cited by 447 publications

(188 citation statements)

References 6 publications

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“…[11], [23], [24], and [26], it is interesting to note that the relationship between S2K and et is universal for all spbericities in the packed bed regime (i.e., 0 < et < 0.7), whereas the relation in the free particle regime (i.e., 0.7 < et < 1) does depend on the sphericity. Nonetheless, the area concentration Se is a useful lengthscale to nondimensionalize the permeability K. Figure 3(a) shows a comparison of S2K as calculated from Eqs.…”

Section: A Globular Grainsmentioning

confidence: 99%

“…To further verify the model prediction in the free particle regime for spherical grains, we resort to Garside and Dibouni's data. [24] These authors have summarized results of a wide variety of sedimentation and fluidization experiments reported in the literature for solid/liquid systems. The most reliable values of the settling ratio at high liquid fractions were provided in Table II …”

Section: A Globular Grainsmentioning

confidence: 99%

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Multiparticle interfacial drag in equiaxed solidification

Wang

Ahuja

Beckermann

et al. 1995

Metall Mater Trans B

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A physical model is proposed for the solid/liquid interfacial drag in both globular and dendritic equiaxed solidification. By accounting for the presence of multiple particles and the nonsphericity and porosity of the individual equiaxed crystals, a drag correlation is developed, which is valid over the full range of solid volume fractions. It is shown that neither the solid liquid interfacial area concentration nor the grain size alone is adequate to characterize the interfacial drag for equiaxed dendritic crystals in both the free particle and packed bed regimes; thus, the present model is based on a multiple length scale approach. The model predictions are compared to previous analytical and numerical results as well as to experimental data available in the literature, and favorable agreement is achieved.

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Section: A Globular Grainsmentioning

confidence: 99%

Section: A Globular Grainsmentioning

confidence: 99%

Multiparticle interfacial drag in equiaxed solidification

Wang

Ahuja

Beckermann

et al. 1995

Metall Mater Trans B

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“…is the ratio of the terminal velocity of a group of particles to the terminal velocity of a single particle , , obtained from the following correlation [11,29]: with The fluid-particle force considered in this paper includes the drag force, the buoyancy and the fluid pressure gradient…”

Section: Fig 1 the Block Flow Diagram Of Sedifoammentioning

confidence: 99%

Study of sedimentation of non-cohesive particles via CFD–DEM simulations

Sun

Cai

et al. 2017

Granular Matter

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The sedimentation process of granular materials exists ubiquitously in nature and many fields which involve the solid-liquid separation. This paper employs the coupled computational fluid dynamics and discrete element method (CFD-DEM) to investigate the sedimentation process of non-cohesive particles, including the hindered settling stage and the deposition stage. Firstly, the coupled CFD-DEM model for sedimentation is validated by the hindered settling velocity at different solid volume concentrations of suspension , i.e., = 0.05~0.6. Two typical modes of sedimentation are also presented by the concentration profiles and the equal-concentration lines. Then, the comparisons between mono-and poly-dispersed particle system are detailed. In the sedimentation of the poly-dispersed particle system, the segregation phenomenon is simulated. Furthermore, this segregation effect reduces with the increase of the initial solid concentration of suspension. From the simulations, the contact force between every pair of particles can be obtained, hence we demonstrate the "effective stress principle" from the view of the particle contact force by giving the correspondence between the particle contact force and the "effective stress", which is a critical concept of soil mechanics. We also demonstrate the effective stress principle from the view of the contact force acting on particles.Moreover, the deposition stage can be simulated by CFD-DEM method, therefore the solid concentrations of sediment bed max on different conditions are studied. Based on the simulation results of max and the theory of sedimentation, this paper also discusses a method to calculate the critical time when sedimentation ends of two typical modes of sedimentation.

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“…Arguments have been raised against this approach: a particle is surrounded by 'clear' fluid and therefore the buoyancy should be based on the fluid density. Some hydrodynamic models are indeed based on the fluid density instead of the suspension density [8,32]. In the theoretical part of this work the concept of buoyancy forces based on the suspension density is critically analyzed and the result is used for a clear definition of the separation tendency of a binary mixture of particles.…”

Section: Buoyancy In Fluidized Bedsmentioning

confidence: 99%

Particle mixing and separation in a binary solids floating fluidized bed

1995

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The floating gas-solid fluidized bed (FGSFB) is a large-particle fluidized bed confined in a tapered column with inserted grids. By application of two types of particles in an FGSFB, a wide variety of operations can be carried out. The visual appearance and the hydrodynamic behaviour of such binary FGSFBs is reported in this paper. Two extreme types of behaviour were observed in the experimental set-up: (1) almost complete separation occurs in beds of two types of particle with the same diameter but a particle density ratio pp.2/Pp. 1 of ca. 2 (±1400 vs±700 kg/m3); (2) a relatively well-mixed situation is found in beds with two types of particle having the same density but a particle diameter ratio dp.2dp,~ of ca. 2 (3.0 vs 1.7 mm). Experimentally determined pressure gradient values were always within the range of those measured for FGSFBs of the single-particle type. A measure for the separating force, the so-called separation tendency W, is derived and shown to be quantified by single-particle properties. Its value can be used to predict whether complete or intermediate mixing occurs, or if the binary FGSFB will be completely separated.

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Velocity-Voidage Relationships for Fluidization and Sedimentation in Solid-Liquid Systems

Cited by 447 publications

References 6 publications

Multiparticle interfacial drag in equiaxed solidification

Multiparticle interfacial drag in equiaxed solidification

Study of sedimentation of non-cohesive particles via CFD–DEM simulations

Particle mixing and separation in a binary solids floating fluidized bed

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