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Investigation of acoustic signals as a tool for characterizing spouted bed dynamics
Author(s) -
Oliveira W.P.,
Grace J.R.,
Lim C.J.,
Hodgson M.R.
Publication year - 2009
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.20158
Subject(s) - body orifice , inlet , conical surface , materials science , acoustic emission , range (aeronautics) , particle (ecology) , acoustics , flow (mathematics) , mechanics , composite material , geology , physics , mechanical engineering , engineering , oceanography
The feasibility of characterizing the dynamics of a spouted bed based on acoustic emission (AE) signals is evaluated. Acoustic emission signals were measured in a semi‐cylindrical Plexiglas column of diameter 150 mm and height 1000 mm with a conical base of internal angle 60° and 25 mm inlet orifice diameter. Data were obtained for U / U ms from 0.3 to 2.0, static bed height from 250 to 500 mm, and glass beads of diameter 1.2 and 2.4 mm. AE signals reflected the effects of particle size and U / U ms , but in general were insensitive to bed depth, even when there were drastic changes in spouting flow patterns. The results indicate that the AE signals were insensitive to the spouted bed hydrodynamics for the conditions studied. Overall, it appears that the AE analysis is unlikely to be a suitable technique for discriminating spouted bed flow regimes, at least for the range of frequencies and operating conditions investigated.