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Drag force on the particles at the upstream end of a packed bed and the stability of the roof of bubbles in fluidised beds

✍ Scribed by J.B.L.M. Campos; J.R.F. Guedes de Carvalho

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
539 KB
Volume
47
Category
Article
ISSN
0009-2509

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✦ Synopsis

A study is reported on the "bed support experiment" in which measurements of the minimum supporting velocity are performed for a wide range of conditions. Values of the drag coefficient for the particles at the upstream end of a packed bed are then calculated, and the data are seen to be well represented by C* = 650/Re + 16.9.

The analysis of drag forces is applied to a study of the stability of the roof of bubbles in fluid&d beds. It is concluded that gas throughflow is sufficient to hold up the particles on the roof of spherical bubbles in 3Dbeds, bat that it is insufficient to prevent particles from raining down across cylindrical bubbles in 2D-beds.

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