Abstract
Suppose we progressively increase the velocity of fluid which is flowing upward through a batch of solids. The frictional resistance increases, and eventually a point is reached where the resistance just equals the weight of solids. At this point the solids become suspended—in other words, they
Transition from a packed to a fluidized bed as the velocity of upflowing fluid is raised.
Frictional loss in the packed and in the fluidized state.
become “fluidized”—and the superficial velocity of fluid needed to just fluidize the solids is called the minimum fluidizing velocity u mf . As the flow rate of fluid is increased beyond this point a liquid fluidized bed keeps expanding, while a gas bed expands only slightly. This progression is shown in Fig. 7.1. The fluidized state has many desirable liquidlike properties. For example, we can easily move solids about just by pumping or by gravity flow.
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References
C. Y. Wen and Y. H. Yu, A generalized method for predicting the minimum fluidization velocity, AIChE J. 12, 610 (1966).
D. Kunii and O. Levenspiel, Fluidization Engineering, Chapter 3, Krieger, Melbourne, FL (1979).
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© 1984 Plenum Press, New York
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Levenspiel, O. (1984). Flow in Fluidized Beds. In: Engineering Flow and Heat Exchange. The Plenum Chemical Engineering Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6907-7_7
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DOI: https://doi.org/10.1007/978-1-4615-6907-7_7
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