A discrete particle simulation study on the influence of restitution coefficient on spout fluidized bed dynamics

Citation
9th International Conference on Circulating Fluidized Beds, CFB 2008, in Conjunction with the 4th International VGB Workshop on Operating Experience with Fluidized Bed Firing Systems (2008)
Contribution to Conference
9th International Conference on Circulating Fluidized Beds, CFB 2008, in Conjunction with the 4th International VGB Workshop on Operating Experience with Fluidized Bed Firing Systems  
Scopus ID
2-s2.0-84904803243
In this paper the influence of the normal restitution coefficient on the bed dynamics during different flow regimes was studied using the discrete element model. The three flow regimes comprise the intermediate/spout- fluidization, spouting-with-aeration regime and the jet-in-fluidized-bed. It is shown that with increase of the restitution coefficient the average bed height decreases for all flow regime cases. To study the influence of the granule impact velocity and the liquid film on the wall surface the free-fall experiments in the velocity range of 0.5-4.5 m/s were performed with spherical γ-Al2O3 granules. During the free-fall tests, the impact angle from 0° to 80° and the viscosity of thin liquid film in the range of 1-300 mPa·s were varied.