Modeling of the Spray Zone for Particle Wetting in a Fluidized Bed

Authors

  • Manuel Heine,

    Corresponding author
    1. Hamburg University of Technology, Institute of Solids Process Engineering and Particle Technology, Denickestraße 15, 21073 Hamburg, Germany
    • Hamburg University of Technology, Institute of Solids Process Engineering and Particle Technology, Denickestraße 15, 21073 Hamburg, Germany
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  • Dr.-Ing. Sergiy Antonyuk,

    1. Hamburg University of Technology, Institute of Solids Process Engineering and Particle Technology, Denickestraße 15, 21073 Hamburg, Germany
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  • Dr.-Ing. Lennart Fries,

    1. Nestlé Research Center Lausanne, Route du Jorat 57, 1000 Lausanne 26, Switzerland
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  • Dr.-Ing. Gerhard Niederreiter,

    1. Nestlé Research Center Lausanne, Route du Jorat 57, 1000 Lausanne 26, Switzerland
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  • Prof. Dr.-Ing. Stefan Heinrich,

    1. Hamburg University of Technology, Institute of Solids Process Engineering and Particle Technology, Denickestraße 15, 21073 Hamburg, Germany
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  • Prof. Dr.-Ing. Stefan Palzer

    1. Nestlé Product Technology Centre York, Haxby Road, York YO91 1XY, United Kingdom
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Abstract

In a spray agglomeration process the particle wetting influences the agglomerate growth and particle dynamics in the granulator. The mass of binder liquid that is deposited on single particles affects the amount of energy dissipation during particle contacts. For the agglomeration of colliding particles the whole impact energy has to be dissipated due to viscous and capillary adhesion forces in the liquid film and plastic deformation of the material. Therefore, a detailed knowledge of the particle wetting is necessary to model the agglomeration process. This contribution uses a coupled DEM-CFD approach to describe the spray zone of a two-fluid nozzle in a fluidized bed agglomerator. Droplets modeled as discrete elements showed the formation of a spray zone with a conical shape. Simulations of the spray zone and the wetting of single particles are in good agreement with experimental results.

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