Abstract
The dependence of the fully-developed flow profiles on the inlet flow conditions for gas-solids two-phase flows, i.e. the flow multiplicity phenomenon, in circulating fluidized bed (CFB) risers was proposed and discussed in this article. The flow multiplicity phenomenon for gas-solids two-phase flows was first proved mathematically based on the conservation equations of mass and momentum. Then the CFD model using Eulerian-Eulerian approach with k-ε turbulence model for each phase was further adopted to analyze the details of this flow multiplicity phenomenon. It is theoretically and numerically revealed that for gas-solids two-phase flows, the flow profiles in the fully-developed region are always dominated by the flow profiles at the inlet. The solids concentration profile is closely coupled with the velocity profile, and the inlet solids concentration and velocity profiles can largely influence the fully-developed concentration and velocity profiles.
| Original language | English |
|---|---|
| Pages (from-to) | 660-670 |
| Number of pages | 11 |
| Journal | International Journal of Multiphase Flow |
| Volume | 37 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jul 2011 |
| Externally published | Yes |
Keywords
- CFB riser
- CFD simulation Eulerian-Eulerian approach
- Flow multiplicity phenomenon
- Gas-solids two-phase flow
ASJC Scopus subject areas
- Mechanical Engineering
- General Physics and Astronomy
- Fluid Flow and Transfer Processes