Spouting in the Gas-Solids Contacting Spectrum

The more common gas-solids contacting systems may be broadly classified as (a) nonagitated, (b) mechanically agitated, and (c) gas-agitated. 

Dilute-phase gas-solids contacting (a suspended bed or transport system) may be more suitable than fluidization, in other process situations. In such systems the contact time between a given particle and the gas is very short—no more than a few seconds—because of very high gas veloci- 

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