Local and global dynamics of shallow gas-fluidized beds

Shallow fluidized beds (SFB) are studied in this paper as a paradigm for deep fluidized beds. We take advantage of their much simpler behavior to analyze their dynamics with a one-dimensional Eulerian-Lagrangian model. After a validation with available experiments, we examine how particle-scale coll...

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Bibliographic Details
Published in:Physics of fluids (1994) 2006-04, Vol.18 (4), p.043303-043303-14
Main Authors: Sierra, C., Tadrist, L., Occelli, R.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Fluidization
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Summary:Shallow fluidized beds (SFB) are studied in this paper as a paradigm for deep fluidized beds. We take advantage of their much simpler behavior to analyze their dynamics with a one-dimensional Eulerian-Lagrangian model. After a validation with available experiments, we examine how particle-scale collisional and hydrodynamic phenomena combine to produce the overall dynamics of SFB. Characteristic times governing the particle's motion are evidenced and the coupling with the fluid is also examined. As a perspective to this work we finally discuss the implications of the SFB dynamics for deep beds. We show that despite the severe simplifications, the model is able to reproduce the temporal dynamics of deep beds and that the internal structuring of SFB is similar in nature to bubbling beds.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.2196448