Particle tracking velocimetry was successfully used to study the three-dimensional solids movement of large dispersed beads in a vertical column. For the large beads, overlap was a major limitation, especially at high bead concentrations. Thus, an additional image enhancement algorithm for particle decomposition was developed as a preprocessor. The beads experienced high axial and radial fluctuation values; but, these increases were less than for the fluid phase itself. This is, no doubt, a result of the higher inertia of the beads relative to the fluid. The bead fluctuations are less for the radial component than for the axial component, which is similar to that for the fluid phase. From the results of the histogram analysis, the higher bead concentrations period provided broader and more scattered distributions except for the initial transport period. Finally, comparisons were possible with the data obtained and predictions from a variety of theoretical approaches. (C) 2000 Elsevier Science Ltd. All rights reserved.
Bibliographical noteFunding Information:
The authors wish to thank the National Science Foundation for an International Cooperative Grant with the Czech Republic for the support of this work. The support of the Department of Chemical Engineering for S.J. Haam throughout the two periods that he studied in Columbus is also greatly appreciated.
All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Physics and Astronomy(all)
- Fluid Flow and Transfer Processes