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Behaviour of shallow fluidized beds around immersed objects
Author(s) -
Roche G.,
Chavarie C.
Publication year - 1978
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450560302
Subject(s) - mechanics , isobar , flow (mathematics) , porosity , fluidized bed , envelope (radar) , geology , work (physics) , materials science , surface (topology) , geotechnical engineering , geometry , thermodynamics , physics , engineering , mathematics , telecommunications , nucleon , radar , atomic physics
Impermeable and permeable objects were immersed in a shallow gas fluidized bed. The pressure distribution on the surface of impermeable cylinders closely follows the principles of classical hydrostatics. The bottom half of larger bodies is nevertheless influenced by the presence of the bottom of the bed; the top half of completely immersed objects is covered by a defluidized zone which prevents reliable surface pressure measurments with the probes devised in this work. A defluidized zone is also readily formed around the surface of partially immersed porous objects. Experimental isobars measured in the bed around these objects were compared to the predictions of a model relying on a uniform potential flow approach. The agreement between the model and the data is generally good but the flow resistance definitely seems to be larger in the defluidized envelope. The defluidized zone seems to be considerably eroded by the brushing of gas bubbles.