Abstract
Experimental evidence for the two-phase theory of fluidization—that all the gas in excess of that required for incipient fluidization rises in the bubble phase—is discussed from two viewpoints. First, measurements of the volume flow-rate of bubbles in a two-dimensional fluidized bed are compared with the theory and it is found that near the distributor interstitial velocities may be several times the minimum fluidization velocity. Second, an expression for the minimum height of a fluidized bed consistent with the two-phase theory is developed on the basis of Nicklin's theory for bubbling two-phase systems. This is compared with experiments in both two- and three-dimensional beds and it is concluded that in many cases the velocity of gas in the particulate phase is greater than that required for incipient fluidization.
Published Version
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