The bubbling behaviour of fine powders when fluidised

Narrow size cuts of particles in the range 40–260 μm have been examined by X-rays when fluidised by air. No discontinuity in behaviour was observed with decreasing particle size. The bubbles behave the same in all materials except that their velocity increases with decreasing particle size. The visi...

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Bibliographic Details
Published in:Chemical engineering science 1976, Vol.31 (12), p.1179-1192
Main Authors: Rowe, P.N., Yacono, C.X.R.
Format: Article
Language:English
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Summary:Narrow size cuts of particles in the range 40–260 μm have been examined by X-rays when fluidised by air. No discontinuity in behaviour was observed with decreasing particle size. The bubbles behave the same in all materials except that their velocity increases with decreasing particle size. The visible bubble flow is generally less than the excess over minimum fluidisation flow. Almost all flow occurs interstitially near the bottom of the bed but the proportion decreases with height to approach U mf near the top of the bed. Appreciable changes in dense phase voidage occur with fine particles and this varies with bed height.
ISSN:0009-2509
1873-4405
DOI:10.1016/0009-2509(76)85027-0