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The mixing of solids in slugging gas fluidized beds
Author(s) -
Thiel William J.,
Potter Owen E.
Publication year - 1978
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.690240402
Subject(s) - slugging , mixing (physics) , turbulence , mechanics , slug flow , piston (optics) , flow (mathematics) , fluidized bed , chemistry , thermodynamics , physics , two phase flow , quantum mechanics , wavefront , optics
Measurements have been made of axial solids mixing in fluidized beds of 0.05, 0.1, and 0.22 m diameter with a variety of materials at atmospheric pressure. Round nosed slugs, raining slugs, and turbulent bubbling have been investigated. Raining slugs occur with coarser materials. With cracking catalyst round nosed slugs form readily in the smaller diameter beds, but in the largest bed, breakdown to the turbulent state was normal. A model has been developed to predict the axial solids mixing in a slugging fluidized bed containing round nosed slugs. The model supposes that each slug is followed by a well‐mixed wake and a piston flow region. The model predicts well the scale effect noted by W. G. May. Axial mixing is fast for round nosed slugs, falls for turbulent bubbling, and is low for raining slugs.