BUBBLE SIZE ABOVE AN ISOLATED GAS JET PENETRATING A FLUIDIZED BED

This contribution deals with the size of bubbles forming in a fluidized bed above an isolated jet streaming from a nozzle into the bed and expressed in terms of the bubble diameter d B . It is shown that the relation proposed by Rowe (1976) for a freely bubbling fluidized bed can be modified to enab...

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Bibliographic Details
Published in:Chemical engineering communications 1987-01, Vol.62 (1-6), p.303-314
Main Authors: BEJCEK, v., NEUZIL, L., YATES, J.G., CHEESMAN, D.J.
Format: Article
Language:English
Subjects:
Applied sciences
Bubbles
Chemical engineering
Exact sciences and technology
Fluidization
Gas jet
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Summary:This contribution deals with the size of bubbles forming in a fluidized bed above an isolated jet streaming from a nozzle into the bed and expressed in terms of the bubble diameter d B . It is shown that the relation proposed by Rowe (1976) for a freely bubbling fluidized bed can be modified to enable a prediction to be made of bubble sizes above an isolated submerged jet. Bed superficial velocity U b calculated from the constant area S b of the fluidized bed along its height is substituted by the superficial velocity U c calculated using the effective cross-sectional area of the heterogeneous jet S c' taken as the horizontal cross-section of the cloud. The modified equation: has been verified experimentally. The variable z in the equation denotes the vertical height above a point where a hypothetical bubble would have zero diameter.
ISSN:0098-6445
1563-5201
DOI:10.1080/00986448708912066