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Gas flow patterns in spouted beds
Author(s) -
Van Velzen D.,
Flamm H. J.,
Langenkamp H.
Publication year - 1974
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.5450520202
Subject(s) - annulus (botany) , mechanics , prandtl number , nozzle , flow (mathematics) , inlet , momentum (technical analysis) , tube (container) , momentum transfer , volumetric flow rate , materials science , geology , thermodynamics , heat transfer , physics , optics , geomorphology , composite material , finance , scattering , economics
Profiles of local spout gas velocity, in both radial and vertical directions, were determined with a Prandtl tube, and of annulus gas velocities from static pressure measurements. It was deduced that the parameter governing the spout gas velocity is the momentum transfer rate at the gas inlet, and not particle characteristics. The results also showed evidence of downward gas flow in the annulus and thus recirculation of gas in the vicinity of the entrance nozzle, which is an hitherto unknown aspect of the spouted bed gas flow pattern.