Segregation of fluidized binary mixtures of granular solids

Olivieri, Giuseppe; Marzocchella, Antonio

doi:10.1002/aic.10340

Cited by 109 publications

(52 citation statements)

References 30 publications

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“…8,12,14 As for the systems investigated in this article (GB499-GB271, GB499-GB172, and GB631-GB154), the experimental dependence of e mf,m on x f is plotted in Figure 6. Values of e mf,m drawn from these curves have been used when applying Eq.…”

Section: Size-segregating Mixturesmentioning

confidence: 99%

“…The most important of them is the gradual nature of the process, which results from the interaction between the progress of particle suspension and that of the segregation-remixing phenomena to which the two solids are subjected. Accordingly, a different method of analysis, hitherto followed by few other research groups, [8][9][10][11][12] has been proposed. On the ground of it, there is the idea that no incipient fluidization velocity can be defined with reference to a two-component bed, since its fluidization takes place along an extended Correspondence concerning this article should be addressed to B. Formisani at bruno.formisani@unical.it.…”

Section: Introductionmentioning

confidence: 99%

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Fluidization of mixtures of two solids differing in density or size

2010

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The complex mechanism by which homogeneous mixtures of two solids achieve fluidization is subjected to theoretical analysis, to elaborate relationships capable to provide their ''initial'' and ''final fluidization velocity'' u if and u ff , i.e., the limits that encompass the suspension process. The article shows how the equation that describes the force equilibrium of fluidization can be rewritten in forms that account for the distribution of the components of density-or size segregating mixtures during the transition to the fluidized state. This approach leads to the theoretical expression of u if and u ff of either type of system, whose differences of behavior are correctly reproduced by accounting for the voidage reduction typical of beds of particles of different size. The comparison with experimental results at varying mixture composition demonstrates that the equations give a coherent interpretation of the dependence of the fluidization velocity interval of two-solid mixtures on the principal variables of interest.

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Section: Size-segregating Mixturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluidization of mixtures of two solids differing in density or size

2010

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“…The value of q pips is calculated from Eq. (12). The broken curve indicates the apparent density of the bed without the sample, q bip (as in Fig.…”

Section: Effect Of Volume Fraction Of Sample On the Bed Behaviormentioning

confidence: 98%

“…(11), the apparent density of the inert-particle suspension can be calculated by using Eq. (12): q pips = e pips q f + (1 -e pips )q ip (12) When the effect of the sample on the inert-particle suspension is negligible, the value of e pips is equal to that of e bip in Eq. (2).…”

Section: :3mentioning

confidence: 98%

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Effect of Volume Fraction of Material on Separation by Density Difference in a Liquid‐Fluidized Bed of Inert Particles

et al. 2010

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A liquid-fluidized bed was used to separate a pure material from a mixture. A quantity of relatively large sized material was immersed in an inert-particle fluidized bed and the behavior of materials was examined for different liquid velocities. In particular, the volume fraction of the material was varied and its effect on the separation characteristics was examined. The material floats on the inert-particle fluidized bed when the density of the material is lower than the apparent density of the bed, regardless of the volume fraction of the material. The apparent density of the bed can be adjusted by changing the liquid velocity. The materials in the upper portion of the bed affect the properties of the bed below them, i.e., the void fraction decreases and the apparent density increases in the inert-particle suspension when materials are present in the upper portion of the bed. Therefore, the materials float on the bed although the apparent density of the inert-particle suspension obtained from the case without material is less than the density of the material at a relatively high volume fraction of material. This phenomenon occurs more easily for lighter and smaller materials. This means that small inert particles and low liquid velocities are the optimum operating conditions for the separation.

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Experimental segregation profiles in bubbling gas‐fluidized beds

et al. 2007

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in Wiley InterScience (www.interscience.wiley.com).Species segregation measurements were performed in a fluidized bed composed of a binary, Geldart B mixture. Three system types were explored: size segregation, density segregation, and combined size/density segregation (with the smaller species denser and lighter). Glass and polystyrene mixtures were investigated, at various gas velocity, jetsam concentration, particle-size ratio, particle-density ratio, and bed-aspect ratio combinations. Axial and radial segregation profiles were obtained from frozen bed sectioning. Low-velocities were used in order to minimize the possibility of segregation during bed collapse. In size-segregating systems, coarse particles act as jetsam, with a nearly constant concentration of fines in the flotsam-rich section. For density segregation, heavier particles act as jetsam and segregation behavior is not monotonically dependent on bed composition. A slight radial segregation was observed at all gas velocities, with jetsam accumulating near the wall. In size-and-density-segregating systems, denser particles (smaller and lighter) act as jetsam, with a slightly higher jetsam accumulation near the core of the bed. At higher gas velocities, however, the bottom layers become richer in jetsam in the periphery. Collectively, the data provide a robust experimental data set for evaluating the ability of existing and new models to predict species segregation.

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Segregation of fluidized binary mixtures of granular solids

Cited by 109 publications

References 30 publications

Fluidization of mixtures of two solids differing in density or size

Fluidization of mixtures of two solids differing in density or size

Effect of Volume Fraction of Material on Separation by Density Difference in a Liquid‐Fluidized Bed of Inert Particles

Experimental segregation profiles in bubbling gas‐fluidized beds

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