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<p>This study utilized a CFD-DEM method to simulate and optimize a gas-solid mixer using corn particles as a representative case to address the limited research on the structural parameters of gas-solid mixers for food particles in pneumatic conveying. The key structural factors that influence the mixer’s performance, including nozzle length, contraction sectional length, and the angle between the feeding and mixing sections, were analyzed. This study identified the optimal parameters as a nozzle length of 130 mm, a contraction sectional length of 100 mm, and an angle of 70° between the feeding and mixing sections using an orthogonal experimental design under specific operating parameters. Simulation tests with these optimized parameters achieved a maximum conveying velocity of 22.81 m/s, representing an 18.1 % improvement over the unoptimized velocity of 19.31 m/s. Bench-scale tests confirmed the accuracy of the optimization, with a maximum average conveying velocity of 22.38 m/s and only a 1.8 % deviation from the simulation result. The optimized gas-solid mixer not only achieved a significant increase in conveying speed but also exhibited reduced particle deposition in the mixing section, providing valuable insights for its engineering application.</p>

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Optimization of the structure of a grain particle gas-solid mixer based on a CFD-DEM orthogonal experiment

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Haojun Zhao,
  • Mingxu Wang,
  • Guozeng Wu,
  • Lan Wu,
  • Jiangfeng Ouyang,
  • Zhijie Song

摘要

This study utilized a CFD-DEM method to simulate and optimize a gas-solid mixer using corn particles as a representative case to address the limited research on the structural parameters of gas-solid mixers for food particles in pneumatic conveying. The key structural factors that influence the mixer’s performance, including nozzle length, contraction sectional length, and the angle between the feeding and mixing sections, were analyzed. This study identified the optimal parameters as a nozzle length of 130 mm, a contraction sectional length of 100 mm, and an angle of 70° between the feeding and mixing sections using an orthogonal experimental design under specific operating parameters. Simulation tests with these optimized parameters achieved a maximum conveying velocity of 22.81 m/s, representing an 18.1 % improvement over the unoptimized velocity of 19.31 m/s. Bench-scale tests confirmed the accuracy of the optimization, with a maximum average conveying velocity of 22.38 m/s and only a 1.8 % deviation from the simulation result. The optimized gas-solid mixer not only achieved a significant increase in conveying speed but also exhibited reduced particle deposition in the mixing section, providing valuable insights for its engineering application.