Abstract
A large-eddy simulation of the single-phase turbulent flow in a model cyclone geometry on a uniform, cubic computational grid consisting of 4.9 x 10(6) cells was performed. The Navier-Stokes equations were discretized according to a lattice-Boltzmann scheme. The Reynolds number, based on the inlet velocity and the cyclone body diameter, was 14,000. A standard Smagorinsky subgrid-scale model with c(s) = 0.1, including wall-damping functions, was applied. The 3-D, average flow field was predicted with a high level of accuracy. Furthermore, the simulations exhibit vortex-core precession, that is, the core of the main vortex is observed to move about the geometrical axis of the cyclone in a quasi-periodic manner. The Strouhal number associated with the simulated vortex-core precession was 0.53, whereas 0.49 was experimentally observed in a similar geometry at approximately the same Reynolds number.
Original language | English |
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Pages (from-to) | 1317-1331 |
Number of pages | 15 |
Journal | AIChE Journal |
Volume | 46 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 2000 |
Keywords
- LATTICE-BOLTZMANN SCHEME
- NAVIER-STOKES EQUATION
- LARGE-EDDY SIMULATION
- DUST SEPARATOR
- GAS CYCLONES
- FLUID-FLOW
- AUTOMATA
- EXHAUST