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The Evolution of a Two-dimensional Small-amplitude Voidage Disturbance in a Uniformly Fluidized Bed by D. J. Needham; J. H. Merkin is a Engineering article available to read on EtoBox.

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## Summaw The evolution of a small-amplitude localized voidage disturbance through a two-dimensional fluidized bed is considered. A solution of the full initial-value problem reveals that the stability condition for the uniform state is found to be in agreement with that given by Needham and Merkin [1] for narrow beds. Further, it is shown that for a given flow rate for which the uniform state is unstable, more and more cross-channel modes become unstable with increasing bed width, in accordance with the observations of Didwania and Homsy . Finally a solution is obtained for F ~ 1, where F is the Froude number. The resulting Fourier series is summed numerically, which enables the evolution of the initial disturbance to be followed by plotting contours of constant voidage with increasing time. This shows that in narrow beds the motion is primarily one-dimensional, confirming the supposition of [1], with cross-stream variations becoming more dominant as the bed width increases.

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Author

D. J. Needham; J. H. Merkin

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0022-0833)

Published

1984

Language

EN

Field

Engineering (Physical Sciences)