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Mixing of large particles in two‐dimensional gas fluidized beds
Author(s) -
Fan L. T.,
Chang Y.
Publication year - 1979
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.5450570114
Subject(s) - mixing (physics) , fluidization , bubble , mechanics , fluidized bed , particle (ecology) , materials science , thermodynamics , physics , geology , oceanography , quantum mechanics
The fluidization and solids mixing characteristics of very large particles were investigated in a two‐dimensional gas fluidized bed. Bubble or slug induced drift and gross solids circulation appeared to be the predominant solids mixing mechanisms in this large particle bed. The contribution from wake mixing appeared to be negligible and radial mixing was more rapid than axial mixing. Apparently, segregation in the axial direction resulted from preferential transportation of the lighter particles upwards with rising bubbles and from interparticle competition to fill the voidage created by the rising bubbles. No appreciable segregation occurred in the radial direction. A nonstationary random walk model has been developed to characterize mixing and segregation of fluidized large particles.