Mixing and segregation kinetics in a strongly segregated gas-fluidized bed

The rate of approach to steady state of a gas-fluidized bed composed of a mixture of Fe and glass particles was determined, starting from both initially fully mixed and initially completely segregated conditions. The data were interpreted using a model based on a pure jetsam statum underlying a unif...

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Bibliographic Details
Published in:Powder technology 1987-11, Vol.53 (1), p.31-38
Main Authors: BEECKMANS, J. M, STAHL, B
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Fluidization
Online Access:Get full text
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Summary:The rate of approach to steady state of a gas-fluidized bed composed of a mixture of Fe and glass particles was determined, starting from both initially fully mixed and initially completely segregated conditions. The data were interpreted using a model based on a pure jetsam statum underlying a uniform stratum of mixed composition. The model allowed calculation of the average upward velocity of jetsam particles across the interface between the strata, and of the average downward velocity of jetsam particles in the upper stratum. With some exceptions, values of the two parameters calculated using the two types of runs agreed well. The mean upward jetsam velocity at the interface and the jetsam descent velocity in the upper stratum were both found to be strongly increasing functions of the excess fluidization velocity. 11 ref.--AA
ISSN:0032-5910
1873-328X