Particle-Tracking Studies for Solids Motion in a Gas Fluidized Bed
Lin, Jengshyan
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https://hdl.handle.net/2142/67035
Description
Title
Particle-Tracking Studies for Solids Motion in a Gas Fluidized Bed
Author(s)
Lin, Jengshyan
Issue Date
1981
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
It is known that solids motion plays important roles in heat and mass transfer in fluidized beds. The lack of techniques for systematic, quantitative exploration of the solids velocities has seriously hampered the fundamental understanding of transport processes in a fluidized bed. The present study concerns the development of a technique, based on radioactive particle tracking, to study the solids motion in fluidized beds. The principle, design and fabrication of the facility are described in detail in this dissertation. Data reduction schemes are also presented.
The mean velocity distributions of solids, ranging from 0.42 and 0.8 mm, fluidized by air flows, ranging from 1.65 to 4.6 times the minimum fluidizing velocity, are presented. It was found that the patterns of gross solids circulation were heavily dependent on the fluidizing velocity and particles size. Sample measurements of limited range of conditions were also obtained for a bed with a distributor plate smaller than the bed cross section and for a bed with a spherical internal structure.
In addition, several exploratory studies were also conducted. Sample results of the Lagrangian auto-correlation and turbulent shear stress of the fluctuating velocities are presented. Furthermore, by superimposing selected sets of the tracer's location data to "synthesize" the stratified bed experiments, a picture of the solids mixing was obtained. The results suggest that they are feasible and could be valuable in furthering the understanding of fluidized bed dynamics.
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