A Study of Vertical Gas Jets in a Bubbling Fluidized Bed
- Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of Florida, Gainesville, FL (United States)
A detailed experimental study of a vertical gas jet impinging a fluidized bed of particles has been conducted with the help of Laser Doppler Velocimetry measurements. Mean and fluctuating velocity profiles of the two phases have been presented and analyzed for different fluidization states of the emulsion. The results of this work would be greatly helpful in understanding the complex two-phase mixing phenomenon that occurs in bubbling beds, such as in coal and biomass gasification, and also in building more fundamental gas-solid Eulerian/Lagrangian models which can be incorporated into existing CFD codes. Relevant simulations to supplement the experimental findings have also been conducted using the Department of Energy's open source code MFIX. The goal of these simulations was two-fold. One was to check the two-dimensional nature of the experimental results. The other was an attempt to improve the existing dense phase Eulerian framework through validation with the experimental results. In particular the sensitivity of existing frictional models in predicting the flow was investigated. The simulation results provide insight on wall-bounded turbulent jets and the effect frictional models have on gas-solid bubbling flows. Additionally, some empirical minimum fluidization correlations were validated for non-spherical particles with the idea of extending the present study to non-spherical particles which are more common in industries.
- Research Organization:
- Regents Of The University Of Michigan, Ann Arbor, MI (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- NT0007649
- OSTI ID:
- 1064409
- Country of Publication:
- United States
- Language:
- English
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