3. Gas velocity at fluidization threshold. Bed expansion correlations
Consider a thick stack of divided solids at rest, resting on a horizontal, porous plate. This forms a fixed bed of interstitial porosity ε 0 , cross-section A and height H 0 .
If, after crossing the support plate, an upward gas flow is imposed through the bed, the vertical aeraulic force imposed increases with the gas flow rate:
with :
- U :
-
gas velocity in an empty barrel, or surface velocity.
Above a certain flow rate, this force can compensate for the apparent weight of the particle bed, the inter-particle distance increases and the bed relaxes, its thickness becoming H > H 0...
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Gas velocity at fluidization threshold. Bed expansion correlations
Fluidization regimes: dense bed and circulating bed
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