Fluidised binary mixtures in which the denser component may be flotsam

Chiba, Shigeo; Nienow, Alvin W.; Chiba, Tadatoshi; Kobayashi, Haruo

doi:10.1016/0032-5910(80)85001-7

Cited by 74 publications

(46 citation statements)

References 4 publications

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“…It is noteworthy that U mf,J Ͻ U mf,F in this case, consistent with the known feature that density differences frequently overtake size differences as the driving force of segregation. 36 System 2 is characterized by solids components having equal diameters and different densities. Again, denser particles are the jetsam in this case.…”

Section: Methodsmentioning

confidence: 99%

“…Again, denser particles are the jetsam in this case. 36 System 3 is characterized by solids components having equal densities and different particle sizes. Coarser particles represent the jetsam component.…”

Section: Methodsmentioning

confidence: 99%

“…Coarser particles represent the jetsam component. 36 In any case, solids were chosen with the further constraint that the terminal velocity of the flotsam be larger than the minimum fluidization velocity of the jetsam.…”

Section: Methodsmentioning

confidence: 99%

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Segregation of fluidized binary mixtures of granular solids

2004

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Segregation of fluidized binary mixtures of granular solids

2004

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“…However, if the finer solid is sufficiently fine a point will be reached in which the denser component acts as flotsam, as observed a few decades ago by Chiba et al [36]. It can be shown that, in general, when the effect of size difference counteracts that of the density difference, even the basic question of which one component does act as flotsam in the mixture is not at all trivial.…”

Section: Introductionmentioning

confidence: 83%

Segregation direction reversal of gas-fluidized biomass/inert mixtures – Experiments based on Particle Segregation Model predictions

Renzo

Maio

Girimonte

et al. 2015

Chemical Engineering Journal

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The tendency for a gas-fluidized binary mixture to segregate or mix as a function of the size and density of the two solids, despite the extensive research efforts motivated by its strong influence on reactor performances, is still not fundamentally and thoroughly understood. Recently, the Particle Segregation Model (PSM) [1] has been proposed as a theoretical tool to predict the segregation direction of gently fluidized mixtures. An important and previously overlooked result, also predicted by PSM, is the presence of peculiar conditions in which the flotsam and jetsam components, for a given solid pair, may invert their role upon changing bed composition. In the present work, the segregation behavior of biomass/inert mixtures is investigated with the specific aim to check for the occurrence of this peculiar segregation direction reversal. Crushed olive pits are used as model biomass (1.54 mm diameter) in combination with glass beads (0.25 mm diameter) and two sand cuts (0.34 and 0.16 mm diameter). The segregation tendency of an initially mixed biomass/inert bed, deduced by the measured steady-state composition profiles, turns out to confirm the presence of segregation direction reversal as a result of a change of the relative solid volume fractions. Although the critical "equilibrium" composition is quantitatively captured only for the first pair, the occurrence of the phenomenon appears remarkably in agreement with the PSM predictions in all the three cases.

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“…In a bed made of particles with identical densities and different sizes, segregation is likely to occur when there is a significant difference in the drag force per unit weight between different particles. Particles subjected to higher values of drag force per unit weight (the smaller particles) tend to migrate to top of the bed, while the ones subjected to low values of drag per unit weight tend to sink to the bottom (Chiba et al, 1980). Gibilaro and Rowe (1974) and Naimer et al (1982) discussed in detail the mechanisms of mixing and segregation in fluidized beds and proposed models to describe particle segregation in binary mixtures of solids fluidized by a gas.…”

Section: Introductionmentioning

confidence: 99%

Effects of binary particle size distribution on the fluid dynamic behavior of fluidized, vibrated and vibrofluidized beds

Daleffe

Ferreira

Freire

2008

Braz. J. Chem. Eng.

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-In this work the effects of particle size distribution on the dynamics and segregation patterns in fluidized, vibrated and vibrofluidized beds were investigated. A binary particle size distribution and a reference one composed of glass spheres with a mean Sauter diameter of 2.18×10 -3 m were tested. The experimental setup consisted basically of a circular glass chamber with a height of 0.50 m and a diameter of 0.114 m, operated in the fluidized bed mode ( = 0.00), in either vibrated or vibrofluidized bed modes ( = 2.00). The pressure drops in the fluidized and vibrofluidized beds were not significantly affected by the binary particle size distribution. Well-defined segregation patterns occurred in fluidized and vibrated beds with small particles concentrating at the top and large particles at the bottom in the first situation and the reverse in the second one. Segregation patterns in vibrofluidized beds depended on the values of vibration parameters. Segregation in vibrofluidized and vibrated beds was minimized by operating at a high amplitude of vibration.

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Fluidised binary mixtures in which the denser component may be flotsam

Cited by 74 publications

References 4 publications

Segregation of fluidized binary mixtures of granular solids

Segregation of fluidized binary mixtures of granular solids

Segregation direction reversal of gas-fluidized biomass/inert mixtures – Experiments based on Particle Segregation Model predictions

Effects of binary particle size distribution on the fluid dynamic behavior of fluidized, vibrated and vibrofluidized beds

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