Fluidized beds consisting of solid particles suspended in a counter gravity flow of gas are widely utilized in the petroleum, chemical and metallurgical industries and are proposed for coal combustion and gasification. It is widely recognized that the method used to introduce the fluidizing gas affects the chemical performance of the fluidized bed. However, little is known about the distribution region of an industrial fluidized bed which contains non-moving solids, moving but non-fluidized solids, emulsion (bubble free) fluidized solids, bubble regime fluidized solids and gas jets. Investigators of this region have been impeded by the lack of an effective tool to discriminate among the several gas-solid regimes.
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