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Analyzing dominant particle-flow structures inside a bubbling fluidized bed using POD

DOI: 10.1615/THMT-18.850
pages 803-806

Mohammad Reza Haghgoo
Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N 5A9, Canada

Donald J. Bergstrom
Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N 5A9, Canada

Raymond J. Spiteri
Department of Computer Science, University of Saskatchewan, Saskatoon, SK, S7N 5C9, Canada


The particle velocity field inside a bubbling fluidized bed exhibits strong unsteady flow patterns accompanied by intense meso-scale fluctuations induced by the motion of bubbles: state-of-the-art post-processing methodology, namely the proper orthogonal decomposition (POD), is applied to the fluctuating particle flow fields predicted by a two-fluid model of a bubbling bed to identify and analyze the dominant spatio-temporal patterns of the particle phase. Three-dimensional POD results indicate that the dominant particle fluctuating velocity patterns are principally aligned in the axial direction, corresponding to particle mixing by the bubble wakes, with significant laterally-directed fluctuating velocity vectors at the bed surface, corresponding to mixing caused by the bubbles bursting. The swirling strength criterion is also used to identify particle vortical motions.

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