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Chemical Engineering Fluid Mechanics, Third Edition, 3rd Edition by Raj P. Chhabra, Ron Darby

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15

Fluidization and Sedimentation

“I never teach my pupils. I only attempt to provide the conditions in which they can learn.”

—Albert Einstein, 1879–1955, Physicist

I.    FLUIDIZATION

When a fluid is passed upward through a bed of particles, as illustrated in Figure 15.1, the pressure drop increases as the fluid velocity increases. The product of the pressure drop and the bed crosssectional area represents the net upward force acting on the bed, and when this force becomes equal to the weight of the bed (solids plus fluid), the bed becomes suspended by the fluid. In this state, the particles can move freely within the “bed,” which thus behaves much like a boiling liquid. Under these conditions, the bed is said to be “fluidized.” This “freely ...

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