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Cloud patterns around a bubble growing in a gas-fluidized bed

Published online by Cambridge University Press:  20 April 2006

R. Collins
R. Collins
Affiliation:
Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE
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Abstract

The gas-flow pattern that occurs when a bubble grows during its passage through a fluidized bed is investigated by applying Davidson's (1961) model in an unsteady manner. It is found that the form of the cloud perceived by an observer of this unsteady motion is significantly different from that predicted by the steady theory. Growth is shown to lead to a reduction in the penetration of the cloud ahead of the bubble and a reduction in the area of overlap between cloud and particles. The cloud boundary also interaepts the bubble boundary, and the gas entering the bubble to sustain its growth does so through its base. There is good agreement with experimental observation of clouds.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 122 , September 1982 , pp. 155 - 167
Copyright
© 1982 Cambridge University Press

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References

Clift, R., Grace, J. R., Cheung, L. & Do, T. H. 1972 J. Fluid Mech. 51, 187.
Collins, R. 1965 Chem. Engng Sci. 20, 747.
Collins, R. 1980 In Proc. Int. Conf. on Fluidization, Henniker, N.H. (ed. J. R. Grace & J. Matsen), pp. 24–32. Plenum.
Davidson, J. F. 1961 Trans. Inst. Chem. Engrs 39, 230.
Davidson, J. F. & Harrison, D. 1966 Chem. Engng Sci. 21, 731.
Murray, J. D. 1965a J. Fluid Mech. 21, 337.
Murray, J. D. 1965b J. Fluid Mech. 22, 57.
Rowe, P. N., Partridge, B. A. & Lyall, E. 1964 Chem. Engng Sci. 19, 973.
Stewart, P. S. B. 1968 Trans. Inst. Chem. Engrs 45, 60.