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Axial dispersion characteristics of three (liquid‐liquid‐solid) phase fluidized beds
Author(s) -
Kim Sang D.,
Lee Myung J.,
Han Joo H.
Publication year - 1989
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.5450670214
Subject(s) - dispersion (optics) , continuous phase modulation , péclet number , materials science , phase (matter) , turbulence , mechanics , isotropy , particle (ecology) , phase velocity , particle size , liquid phase , fluidized bed , thermodynamics , chemistry , optics , physics , geology , telecommunications , oceanography , organic chemistry , computer science
The effects of the continuous and dispersed phase velocity and particle size on the axial dispersion of the continuous phase have been determined in two (liquid‐liquid) and three (liquid‐liquid‐solid) phase fluidized beds. In a cocurrent liquid‐liquid flow system, the axial dispersion coefficient increases with both the dispersed and continuous phase velocities. In three phase fluidized beds, the coefficient increases with dispersed phase velocity but it decreases with the particle size. Also the coefficient exhibits a maximum value with an increase in the continuous phase velocity at the lower dispersed phase velocities, but it increases with the continuous phase velocity at higher dispersed phase velocities. The axial dispersion coefficients in terms of Peclet number have been correlated in terms of the ratio of fluid velocities and the ratio of the particle size to column diameter, based on the isotropic turbulence theory.