Solids movement in liquid fluidised beds—II Measurements of axial mixing coefficients

Carlos, Cabarcas Reyes Juan; Richardson, John F.

doi:10.1016/0009-2509(68)80017-x

Cited by 34 publications

(15 citation statements)

References 1 publication

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“…primary mechanism of the transport of solid particles in the bed is dispersion, as pointed out by Carlos and Richardson (1968). This, however, is not the case when two different-sized particles are present in the bed.…”

Section: Introductionmentioning

confidence: 92%

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Particle dispersion in a binary solid‐liquid fluidized bed

Asif

Petersen

1993

AIChE Journal

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The mixing and segregation behavior of liquid fluidized beds containing two different-sized particle species are described mathematically. This model is based on a mass balance, rather than a volume balance, which has been used by most previous researchers. The model also includes the effects of density gradients that are present in the bed. Particle dispersion coefficients in a binary-solid fluidized bed are evaluated using this model. Further, a correlation that allows the calculation of these particle dispersion coefficients is presented, which describes not only dispersion coefficients calculated using the above model, but also those presented by other researchers. It is applicable over a broad range of variables of practical interest and is based on relevant dimensionless parameters to account for the influence of important particle and fluid properties on the particle dispersion characteristics.

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Section: Introductionmentioning

confidence: 92%

“…The upward movement of fluid does not contribute directly to the net movement of solid particles in the bed. This issue has been discussed in detail by Carlos and Richardson (1968) in the context of solids movement in monosized particle fluidization.…”

Section: Model Descriptionmentioning

confidence: 98%

Particle dispersion in a binary solid‐liquid fluidized bed

Asif

Petersen

1993

AIChE Journal

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“…In the present study we examined the variation in the required value of based on the dispersion coefficient data from the literature. Asif and Petersen (1993) provided an examination of the dispersion coefficients reported by Juma and Richardson (1983), Carlos and Richardson (1968), Kang et al (1990), Dorgelo et al (1985), Yutani and Fan (1985), and Muchi et al (1961). We calculated the value of " " in our Eq.…”

Section: Dispersion Modelmentioning

confidence: 99%

A generalized segregation and dispersion model for liquid-fluidized beds

Patel

Ramirez

Galvin

2008

Chemical Engineering Science

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“…If the recycle ratio is specified then all remaining process properties can be determined from Eqs. (3) and (4). The concentration at the inlet and outlet of the crystallizer is known by material balance, and the initial and final values of the crystal size are specified.…”

Section: Design Proceduresmentioning

confidence: 99%

“…The opposing effects of classification and mixing interact with each other to determine the overall behavior of a fluidized bed crystallizer when the bed is composed of particles of different sizes [2][3][4][5][6][7]. By measuring the particle size distribution at various heights within the bed, Al-Dibouni and Garside [2] concluded that, for values of ratio of largest to smallest particle size present in bed greater than about 2.2, classification dominates the behavior of the fluidized bed and the variation of size distribution with height could be accurately predicted by assuming perfect classification.…”

Section: Introductionmentioning

confidence: 99%