Meso-scale structures of bidisperse mixtures of particles fluidized by a gas |
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Authors: | William Holloway Sofiane Benyahia Christine M. Hrenya Sankaran Sundaresan |
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Affiliation: | aDepartment of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, United States;bNational Energy Technology Laboratory, Morgantown, WV 26505, United States;cDepartment of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, United States |
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Abstract: | Flow characteristics of bidisperse mixtures of particles fluidized by a gas predicted by the mixture based kinetic theory of [Garzó et al., 2007a] and [Garzó et al., 2007b] and the species based kinetic theory model of Iddir and Arastoopour (2005) are compared. Simulations were carried out in two- and three-dimensional periodic domains. Direct comparison of the meso-scale gas-particle flow structures, and the domain-averaged slip velocities and meso-scale stresses reveals that both mixture and species based kinetic theory models manifest similar predictions for all the size ratios examined in this study. A detailed analysis is presented in which we demonstrate when the species based theory of Iddir and Arastoopour (2005) will reduce to a mathematical form similar to the mixture framework of [Garzó et al., 2007a] and [Garzó et al., 2007b]. We also find that the flow characteristics obtained for bidisperse mixtures are very similar to those obtained for monodisperse systems having the same Sauter mean diameter for the cases examined; however, the domain-averaged properties of monodisperse and bidisperse gas-particle flows do demonstrate quantitative differences. The use of filtered two-fluid models that average over meso-scale flow structures has already been described in the literature; it is clear from the present study that such filtered models are needed for coarse-grid simulations of polydisperse systems as well. |
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Keywords: | Fluidization Fluid mechanics Hydrodynamics Multiphase flow Suspension Transport processes |
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