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A flow model for gas movement in spouted beds
Author(s) -
Lim C. J.,
Mathur K. B.
Publication year - 1976
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.690220407
Subject(s) - streamlines, streaklines, and pathlines , residence time distribution , mechanics , annulus (botany) , tracer , plug flow , fluidization , flow (mathematics) , spark plug , range (aeronautics) , dispersion (optics) , helium , residence time (fluid dynamics) , thermodynamics , chemistry , materials science , geology , fluidized bed , physics , geotechnical engineering , organic chemistry , nuclear physics , optics , composite material
Abstract A two‐region model of a spouted bed, postulating vertical plug flow of gas in the spout and dispersed plug flow along curved streamlines in the annulus, is proposed. The extent of axial dispersion is accounted for by a coefficient D which is an adjustable parameter of the model. Experimental support for the theory is provided by residence time‐distribution data obtained by using helium gas as tracer, covering a wide range of conditions. Values of the coefficient D , determined from a comparison between predicted and observed RTD curves, are generally higher than those reported for packed beds but much smaller than those for fluidized beds.