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Fluidization

David Harrison
Science Progress (1933-)
Vol. 61, No. 242 (Summer 1974), pp. 191-217
Stable URL: http://www.jstor.org/stable/43420238
Page Count: 27
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Fluidization
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Abstract

When a fluid is forced upwards through a bed of particles resting on a horizontal gauze, at a flow-rate sufficient to support the buoyant weight of the particles, a fluidized bed is formed and the phenomenon is known as fluidization. This article describes the situation in which the particle bed simply expands to accommodate the fluid flow and the situation in which the fluid flows partly through the particle bed as bubbles. Bubbling fluidization normally occurs when a bed of particles is fluidized by a gas, and it is the case which has the greater number of practical applications. The properties of bubbling fluidized beds are described, and then the use of fluidized beds for chemical catalysis and for applications requiring heat transfer are discussed. The article concludes with an account, with examples, of the considerations that attend the scale-up of fluidized processes from laboratory experiments into industrial enterprises.

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