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Heat transfer to fine powders in a bubbling fluidized bed with sound assistance
Author(s) -
Huang DeShau,
Levy Edward
Publication year - 2004
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10028
Subject(s) - fluidization , heat transfer , fluidized bed , bubble , sound (geography) , residence time (fluid dynamics) , mechanics , particle (ecology) , thermodynamics , tube (container) , materials science , composite material , acoustics , engineering , physics , geotechnical engineering , oceanography , geology
Most of the published research on heat transfer in a fluidized bed is focused on Geldart type B and D particles, while there is little information available on heat transfer to fine powders (Geldart group C). Previous studies of fine powder fluidization with sound assistance have shown that stable bubbling can be achieved with sound assistance. In this study, experiments were performed to measure bubble behavior and heat‐transfer coefficients around a horizontal tube in a fine powder fluidized bed with sound assistance. Two types of data are presented as functions of excess air velocity and sound pressure level—average and local heat‐transfer coefficients and bubble frequency, packet residence time, and the fraction of the particle packet contact time. A packet renewal model with a gas film at the tube surface is proposed to explain the heat‐transfer data. © 2004 American Institute of Chemical Engineers AIChE J, 50: 302–310, 2004