Premium
Axial and lateral dispersion of fine particles in a binary‐solid riser
Author(s) -
Wei Fei,
Cheng Yi,
Jin Yong,
Yu Zhiqing
Publication year - 1998
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.5450760104
Subject(s) - tracer , dispersion (optics) , mixing (physics) , péclet number , residence time distribution , materials science , particle (ecology) , mechanics , optics , physics , flow (mathematics) , geology , oceanography , quantum mechanics , nuclear physics
Axial and lateral mixing of fine particles in a binary‐solid riser have been investigated using a phosphor tracer method. The measured bimodal residence time distribution (RTD) demonstrated two types of axial dispersions of the fines: the dispersion of discrete particles and that of clusters. A proposed one‐dimensional, bimodal dispersion model describes the bimodal RTDs very well. The axial Peclet number of the fines is not sensitive to the fraction of coarse particles, gas velocity and solids circulation rate. Lateral solids dispersion was determined by measuring the solids RTD at different radii using a point source tracer injection. A two‐dimensional dispersion model describes the measured RTDs satisfactorily. Lateral solids mixing decreased as coarse particles were added into the riser. Correlations of the axial and lateral Peclet numbers obtained fit the experimental data well.