Reduction in minimum fluidization velocity and minimum bubbling velocity in gas-solid fluidized beds due to vibration

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 Gro...

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Bibliographic Details
Published in:	Powder technology Vol. 382; pp. 566 - 572
Main Authors:	McLaren, C.P., Metzger, J.P., Boyce, C.M., Müller, C.R.
Format:	Journal Article
Language:	English
Published:	Lausanne Elsevier B.V 01-04-2021 Elsevier BV
Subjects:	Acceleration Bubbling Fluidization Fluidized beds Gravity Minimum bubbling velocity Minimum fluidization velocity Particle density (concentration) Particle size Velocity Vibration Minimum bubbling velocity Vibration Fluidization Minimum fluidization velocity
Online Access:	Get full text
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Summary:	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. [Display omitted] •Vibration can reduce both Umf and the minimum bubbling velocity (Umb).•Umf is reduced more than Umb, thereby creating a densely packed, bubble-free fluidization state.•The results collapsed when scaled by vibration strength.•Umf and Umb increase when moving from a 3D cylindrical system to a pseudo-2D system.
ISSN:	0032-5910 1873-328X
DOI:	10.1016/j.powtec.2021.01.023