Journal
POWDER TECHNOLOGY
Volume 410, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2022.117841
Keywords
Bidisperse; Fluidization; Bubbling and turbulent state; Hydrodynamics; Mixing; segregation characteristic; Multiphase flow
Categories
Funding
- National Natural Science Foundation of China [51676146]
- High -Performance Computing Platform of Xi'an Jiaotong University
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This research investigates the flow dynamics in bubbling and turbulent fluidized beds containing both Geldart-A and B particles. The results show that as the superficial gas velocity decreases, the binary mixture segregation is enhanced, while a larger flotsam packing ratio promotes a homogeneous distribution of flotsam.
Flow dynamics in bubbling and turbulent fluidized beds containing both Geldart-A and B particles were inves-tigated in this research. The numerical model was validated against experimental data, with a 6.16% average deviation. Results show that binary mixture segregation is enhanced as superficial gas velocity decreases. A larger flotsam packing ratio promotes homogeneous flotsam distribution; Second, bed density decreases with increasing bed height or superficial gas velocity. As the flotsam packing ratio decreases from 81.10 to 10.70%, bed density reaches the maximum at 41.50%, indicating the most severe volume contraction; Third, when the flotsam packing ratio decreases, the local mixing index's variances between upper and lower sections in dense phase first increases, then decreases, with stronger radial fluctuation detected; Fourth, as superficial gas velocity or flotsam packing ratio increases, the full mixing height ratio improves; Finally, multivariate correlations for dense phase bed expansion are established, yielding a 3.94% average error.
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