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Investigation of fluidized bed behaviour using electrical capacitance tomography

Azzi, Abdelwahid; Bouyahiaoui, Hiba; Sofiane Berrouk, Abdallah; Hunt, Andrew; Lowndes, Ian S

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Abdelwahid Azzi

Hiba Bouyahiaoui

Abdallah Sofiane Berrouk

Andrew Hunt

Associate Professor and Reader in Environmental Engineering


The temporal and cross?sectional distributions of particles in a 127?mm diameter fluidized bed have been obtained using a new generation, high?speed electrical capacitance tomography. Two planes of eight electrodes were used and mounted at 160?mm and 660?mm from the gas distributor which was a 3?mm thick porous plastic plate (maximum pore size of 50 ?m?70 ?m). 3?mm diameter, nearly?spherical polyethylene granules made up the bed. Experiments at sampling frequencies of 200?2000 cross?sections per second and gas superficial velocities from just below the minimum fluidization to 83% above minimum fluidization velocities were used. The time series of the cross?sectional average void fractions have been examined both directly and in amplitude and frequency space. The last two used probability density functions and power spectral densities. The information gathered shows that the fluidized bed was operating in the slugging mode, which is not surprising given the size of the particles. It has been found that an increase in the excess gas velocity above the minimum fluidization velocity resulted in an increase in the mean void fraction, an increase in the length and velocity of the slug bubbles as well as the bed height, and a slight decrease in the slug frequency. The results are presented in a level of detail suitable for comparison with later numerical simulation.

Journal Article Type Article
Acceptance Date Nov 12, 2019
Online Publication Date Mar 14, 2020
Publication Date 2020-08
Deposit Date Nov 14, 2019
Publicly Available Date Mar 15, 2021
Journal Canadian Journal of Chemical Engineering
Print ISSN 0008-4034
Electronic ISSN 1939-019X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 98
Issue 8
Pages 1835-1848
Public URL
Publisher URL
Additional Information This is the peer reviewed version of the following article: Azzi, A., Bouyahiaoui, H., Berrouk, A.S., Hunt, A. and Lowndes, I.S. (2020), Investigation of Fluidized Bed Behavior Using Electrical Capacitance Tomography. Can J Chem Eng. Accepted Author Manuscript, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.


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