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| Titel: |
STOCHASTIC ANALYSIS OF AXIAL SOLIDS MIXING IN A FLUIDIZED BED |
| Auteur: |
Fox, R. O. Fan, L. T. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 60 (1987) nr. 1-6 pagina's 27-45 |
| Jaar: |
1987 |
| Inhoud: |
Particulate mixing systems lend themselves to a stochastic analysis due to the finite number of discrete particles involved. The physics of mixing at a single particle level can best be seen as a random process since the trajectory of the particle is influenced by many competing factors. In this work, a stochastic model for axial mixing of particles in a fluidized bed is formulated by resorting to the multivariate master equation. Configuration of the bed is cylindrical; it is divided into small axially distributed compartments. The behavior of the bed following the addition of tracer particles to the top of the bed is studied. Experimental data from Qu and Kwauk (1985) are used to estimate the single parameter in the model. Expressions are derived for the mean tracer concentration as well as its variance. The density function of the first passage time for a tracer particle to reach the bottom of the bed is derived, and other extreme value statistics are discussed. A maximum likelihood estimator of the axial dispersion coefficient based on the first passage time for a single tracer particle between two points in the bed is also derived. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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