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Spouting with a porous draft‐tube
Author(s) -
Claflin J. K.,
Fane A. G.
Publication year - 1983
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.5450610315
Subject(s) - annulus (botany) , pressure drop , mechanics , tube (container) , draft tube , porosity , materials science , porous medium , superficial velocity , particle (ecology) , flow (mathematics) , residence time distribution , inlet , airflow , composite material , thermodynamics , mechanical engineering , engineering , physics , geology , oceanography
Particle motion and gas distribution have been measured in 0.3 m spouted beds with porous and solid wall draft‐tubes. Particle velocity in the annulus varied with gas rate and bed geometry. Narrow particle residence time distributions were observed under all conditions. Annular gas flow with the porous tubes exhibited a characteristic maximum in the lower part of the bed. A computer model has successfully simulated this phenomenon. The porous tube had a higher annular airflow than the solid tube at low separation distances, and a lower pressure drop for a given annular flow. A composite porous and solid wall tube offers improved performance.