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TitleA new approach to the identification of transitions in fluidized beds
Publication TypeJournal Article
Year of Publication2010
AuthorsDavies, C.E., Krouse D.P., and Carroll A.
JournalPowder Technology
Pagination107 - 110
Date Published2010
ISSN00325910 (ISSN)
Keywordsanalytic method, analytical parameters, article, Bed height, bed pressure drop, Bubble formation, Bubbling fluidized bed, controlled study, flow kinetics, Fluid dynamics, Fluidization, fluidized bed, Fluidized beds, hydrodynamics, Linear functions, Minimum bubbling velocity, Minimum fluidizing velocity, New approaches, packed bed reactor, Packed beds, particle size, phase transition, Potential utility, Pressure drop, PRESSURE MEASUREMENT, Silica, Silica sand, silicon dioxide, Standard deviation, Superficial velocity, velocity
AbstractEarlier work with silica sand has indicated that in a system where a bed of particles is aerated at increasing superficial velocities, the von Neumann ratio, T, based on the bed pressure drop, may be useful in identifying both minimum fluidizing velocity, Umf, and minimum bubbling velocity, Umb. Plots of T- 1 against superficial velocity exhibited significant change at velocities consistent with those where bed height first changed (onset of fluidization), the packed bed pressure drop underwent a transition from a monotonic linear function of superficial velocity to a steady value (onset of fluidization) and standard deviation of bed pressure drop rapidly increased (onset of bubbling). However, the suggestion that T might be a valid indicator of Umf was supported by data for a single material only. In this paper additional data is presented that supports the suggestion that T might be useful in measuring Umf, and also provides additional evidence for the potential utility of T in determining Umb. In principle, this would allow a single campaign of pressure measurements to be used to identify both Umf and Umb. © 2009 Elsevier B.V. All rights reserved.

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