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Flow patterns in a pilot plant‐scale turbulent fluidized bed reactor: Concurrent application of tracers and fiber optic sensors
Author(s) -
Farag H. I.,
Grislingås A.,
Ege P. E.,
De Lasa H. I.
Publication year - 1997
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.5450750505
Subject(s) - bubble , turbulence , fluidized bed , mass transfer , mechanics , annulus (botany) , tracer , liquid bubble , materials science , phase (matter) , thermodynamics , chemistry , physics , composite material , nuclear physics , organic chemistry
Abstract Hydrodynamics of a turbulent fluidized bed is studied by means of the concurrent application of fiber optic sensors and a helium tracer. It is observed that in the vicinity of the column wall there is a high bubble activity region. Low bubble activity and negative bubble velocities are reported for the dense phase near the column centre‐line region. A temperature increase from 22 to 145°C results in a more homogeneous turbulent fluidized bed with smaller bubbles and more gas flowing through an expanded dense bed emulsion phase. Mass transfer coefficients between bubble‐emulsion ( k be ) and bubble‐annulus ( k ba ) are evaluated. The dominant mass transfer path was the one from the bubbles to the annular region with k ba being several times greater than k be.