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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 1, 2011
Accepted April 5, 2011

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Type transition in onset condition of turbulent fluidization

Jeong-Hoo Choi^† Ho-Jung Ryu¹ Chang-Keun Yi¹

Department of Chemical Engineering, Konkuk University, Seoul 143-701, Korea ¹Korea Institute of Energy Research, Daejon 305-343, Korea

choijhoo@konkuk.ac.kr

Korean Journal of Chemical Engineering, October 2011, 28(10), 2009-2011(3), 10.1007/s11814-011-0091-8

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Abstract

The type transition in onset condition of turbulent fluidization in gas fluidized beds was investigated to obtain the relation representing more precise roles of physical properties of gas and solid particles. The type transition in onset condition of turbulent fluidization occurs at Archimedes number of 20.87 by type transition of bubble breakup. The maximum stable bubble diameter (dbmax) is greater than the equilibrium bubble diameter (dbeq) in the region, Ar<_x000D_ 20.87, but dbeq>dbmax in the region, Ar>20.87. Therefore, the onset of turbulent fluidization is determined in the region, Ar<20.87, by dbeq and in the region, Ar>20.87, by dbmax as the limit of bubble growth. The uc decreases in the region, Ar<20.87, but increases in the region, Ar>20.87 as temperature increases.

Keywords

Type Transition Turbulent Fluidized Bed Onset Velocity Transition Velocity

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