382165 A Numerical Model for the Motion of Large Non-Spherical Solid in Fluidized Bed
382165 A Numerical Model for the Motion of Large Non-Spherical Solid in Fluidized Bed
Wednesday, November 19, 2014: 12:30 PM
210 (Hilton Atlanta)
In a number of practical applications of fluidized bed such as coal/wooden biomass gasification and combustion, the size and shape of solid materials are not uniform and large non-spherical solids are coexisting with small emulsion solids in the bed to enhance fluidization and heat transfer. The size of these solids is largely different; fuel solids are more than ten times larger comparing to emulsion particles. Fuel solids, especially pellets, are far from spherical and the non-sphericity is expected to play an important role for contact and hydrodynamic interactions. It is difficult to treat these systems by the existing numerical models. Tsuji et al. (2014) proposed a numerical model which expresses the behavior of flows including dense solids with large size difference based on the DEM-CFD coupling method. In their model, the interaction force between fluid and large solid is estimated by assuming a large solid is consisted of dense small fictitious particles. Their study was limited to spherical solids. In the present study, on the other hand, non-sphericity of large objects is taken into account by introducing Multi-sphere model. The model was applied to the motion of a single large non-spherical object in a bubbling fluidized bed and validation study was performed through the comparison with corresponding experiment. We observed similar behaviors of the large object between calculation and experiment.
See more of this Session: Fundamentals of Fluidization II
See more of this Group/Topical: Particle Technology Forum
See more of this Group/Topical: Particle Technology Forum