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CFD-DEM Simulation of Spouted Bed Dynamics under High Temperature with an Adhesive Model

Author

Listed:
  • Zhao Chen

    (Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)

  • Lin Jiang

    (Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)

  • Mofan Qiu

    (Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)

  • Meng Chen

    (Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)

  • Rongzheng Liu

    (Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)

  • Malin Liu

    (Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)

Abstract

Particle adhesion is of great importance to coating processes due to its effect on fluidization. Currently, Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) has become a powerful tool for the study of multiphase flows. Various contact force models have also been proposed. However, particle dynamics in high temperature will be changed with particle surface properties changing. In view of this, an adhesion model is developed based on approaching-loading-unloading-detaching idea and particle surface change under high temperature in this paper. Analyses of the adhesion model are given through two particle collision process and validated by experiment. Effects of inlet gas velocity and adhesion intensity on spouted bed dynamics are investigated. It is concluded that fluidization cycle will be accelerated by adhesion, and intensity of fluidization will be marginally enhanced by slight adhesion. Within a certain range, increasing inlet gas velocity will lead to strong intensity of particle motion. A parameter sensitivity comparison of linear spring-damping model and Hertz-Mindlin Model is given, which shows in case of small overlaps, forces calculated by both models have little distinction, diametrically opposed to that of large overlaps.

Suggested Citation

  • Zhao Chen & Lin Jiang & Mofan Qiu & Meng Chen & Rongzheng Liu & Malin Liu, 2021. "CFD-DEM Simulation of Spouted Bed Dynamics under High Temperature with an Adhesive Model," Energies, MDPI, vol. 14(8), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2276-:d:538586
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    References listed on IDEAS

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    1. Tao Chen & Xiaoke Ku & Jianzhong Lin & Henrik Ström, 2020. "CFD-DEM Simulation of Biomass Pyrolysis in Fluidized-Bed Reactor with a Multistep Kinetic Scheme," Energies, MDPI, vol. 13(20), pages 1-19, October.
    2. Abdul Salam, P. & Bhattacharya, S.C., 2006. "A comparative study of charcoal gasification in two types of spouted bed reactors," Energy, Elsevier, vol. 31(2), pages 228-243.
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