Reduction in minimum fluidization velocity and minimum bubbling velocity in gas-solid fluidized beds due to vibration
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Date
2021-04
Publication Type
Journal Article
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yes
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Abstract
Vibration of gas-solid fluidized beds is often used to enable fluidization of cohesive particles; however, it has also been shown to reduce the minimum fluidization velocity (Umf). Here, we show via experiments that vibration can reduce both Umf and the minimum bubbling velocity (Umb) in Geldart Group B and D particles. We observe that Umf is reduced more than Umb, thereby creating a densely packed, bubble-free fluidization state when the superficial gas velocity is in between Umf and Umb. Umf and Umb decrease with increasing vibration frequency and amplitude and the results for Umf and Umb across a variety of vibration conditions could be plotted along a single curve when plotted versus vibration strength, i.e. the ratio of peak vibration acceleration to gravitational acceleration. Changes in Umf and Umb due to vibration are not affected significantly by changing particle density, but in a non-monotonic way by changing particle diameter. © 2021 The Authors
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published
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Journal / series
Volume
382
Pages / Article No.
566 - 572
Publisher
Elsevier
Event
Edition / version
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Date collected
Date created
Subject
Fluidization; Vibration; Minimum fluidization velocity; Minimum bubbling velocity
Organisational unit
03865 - Müller, Christoph R. / Müller, Christoph R.
Notes
Funding
182692 - Understanding multi-phase particulate systems: from (reactive) gas-fluidized beds to dense suspensions via advanced magnetic resonance imaging (MRI) and Lagrangian modeling (SNF)