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Research on the Characteristics of the Solid–Liquid Two-Phase Flow Field of a Submersible Mixer Based on CFD-DEM

Author

Listed:
  • Fei Tian

    (School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Erfeng Zhang

    (School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Chen Yang

    (School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Weidong Shi

    (School of Mechanical Engineering, Nantong University, Nantong 226019, China)

  • Yonghua Chen

    (Yatai Pump & Valve Co., Ltd., Taixing 225400, China)

Abstract

Submersible mixers are widely used in the sewage treatment process in various fields, such as agriculture and industry. They are mainly responsible for pushing flow and mixing activated sludge particles in a pool. Based on the CFD-DEM coupling method under the Euler–Lagrange framework, the solid–liquid two-phase flow of a submersible mixer was simulated in this paper, and the motion characteristics and distribution laws of particles in the pool were studied in axial, horizontal, and lateral directions, respectively. An evaluation method of distribution uniformity was proposed to analyze the velocity distribution of the flow field, the velocity distribution of particles, and the mixing uniformity of particles. The results show that the movement process of activated sludge particles in the pool can be roughly divided into three stages: the horizontal development stage, absorption–injection stage, and reflux-mixing stage, in which the reflux-mixing stage is the main stage for the uniform distribution of particles in the whole flow field. Particle accumulation occurs mainly in the dead zones of the flow field. Distribution of particles in the axial direction has the most homogeneous extent. Vortices can be generated near pool walls, causing accumulation of particles. This method can be a good guide for engineering practice.

Suggested Citation

  • Fei Tian & Erfeng Zhang & Chen Yang & Weidong Shi & Yonghua Chen, 2022. "Research on the Characteristics of the Solid–Liquid Two-Phase Flow Field of a Submersible Mixer Based on CFD-DEM," Energies, MDPI, vol. 15(16), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:6096-:d:894858
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    Cited by:

    1. Hao Wang & Peijian Zhou & Ting Chen & Jiegang Mou & Jiayi Cui & Huiming Zhang, 2023. "Optimization of Liquid−Liquid Mixing in a Novel Mixer Based on Hybrid SVR-DE Model," Energies, MDPI, vol. 16(4), pages 1-17, February.

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