DEM and TFM Simulations of Solids Mixing in Gas-Solid Fluidized Bed

Willem Godlieb, Sander Gorter, Niels G. Deen, J.A.M. Kuipers

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    Abstract

    In the production and processing of granular matter, mixing of solids plays an important role. Granular materials such as sand, polymeric particles and fertilizers are processed in different apparatus such as fluidized beds, rotary kilns and spouted beds. In the operation of these apparatus proper mixing is essential, as it helps to prevent formation of hot-spots, off-spec products and undesired agglomerates. DEM can be used to simulate these granular systems in detail and provide insight in mixing phenomena. Several methods to analyse and characterize mixing on basis of DEM data have been proposed in the past, but there is no general consensus on what method to use. In this paper we discuss various methods that are available to give quantitative information on the solids mixing state in granular systems based on DEM and TFM simulations. We apply the different methods to full 3D DEM simulations of a fluidized bed and to tracer particles in full 2D TFM simulations. It is found that some of these methods are grid dependent, are not reproducible, are sensitive to macroscopic flow patters and/or are only able to calculate overall mixing indices, rather than indices for each direction. We compare some methods described in literature and in addition propose two new methods, which do not suffer from the disadvantages mentioned above. Simulations are performed for seven different operating pressures. It is found that mixing improves with operating pressure caused by increased porosity and increased granular temperature of the particulate phase.
    Original languageEnglish
    Number of pages7
    Publication statusPublished - 9 Dec 2010
    Event7th International Conference on Computational Fluid Dynamics in the Minerals and Process Industries 2009 - Melbourne, Australia
    Duration: 9 Dec 200911 Dec 2009

    Conference

    Conference7th International Conference on Computational Fluid Dynamics in the Minerals and Process Industries 2009
    CountryAustralia
    CityMelbourne
    Period9/12/0911/12/09

    Keywords

    • METIS-263267

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  • Cite this

    Godlieb, W., Gorter, S., Deen, N. G., & Kuipers, J. A. M. (2010). DEM and TFM Simulations of Solids Mixing in Gas-Solid Fluidized Bed. Paper presented at 7th International Conference on Computational Fluid Dynamics in the Minerals and Process Industries 2009, Melbourne, Australia.