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<p>The negative pressure near-wall particle collection method employs suction flow to circulate the medium along the inner wall of the collection port, creating flow separation that affects flow characteristics and particle forces. This investigation utilizes a CFD simulation method, validated through Zhao’s experiments, and implements a “circular pipe suction model” to examine how collection port parameters—specifically wall thickness and shape—influence the flow field and particle collection efficiency across different Reynolds numbers. The findings demonstrate that wall thickness and port shape substantially affect flow separation, as evidenced by recirculation zones that compress the flow and modify the particle force coefficient. Typically, greater wall thickness results in decreased particle force coefficients, with variations up to 15%. Moreover, collection ports with inward-pointing sharp angles demonstrate the highest particle force coefficients, while those with outward-pointing angles show the lowest, exhibiting variations up to 23%. These results indicate that optimizing collection port design through wall thickness and shape modifications can improve particle collection efficiency, enhancing practical applications.</p>

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Effects of Flow Separation on Particle Dynamics in Negative Pressure Near-Wall Collection System

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Xiu Li,
  • Li-xin Xu,
  • Ya-jiao Liu,
  • Pei-lin Dou,
  • Zhi-chao Hong,
  • Chao-shuai Han

摘要

The negative pressure near-wall particle collection method employs suction flow to circulate the medium along the inner wall of the collection port, creating flow separation that affects flow characteristics and particle forces. This investigation utilizes a CFD simulation method, validated through Zhao’s experiments, and implements a “circular pipe suction model” to examine how collection port parameters—specifically wall thickness and shape—influence the flow field and particle collection efficiency across different Reynolds numbers. The findings demonstrate that wall thickness and port shape substantially affect flow separation, as evidenced by recirculation zones that compress the flow and modify the particle force coefficient. Typically, greater wall thickness results in decreased particle force coefficients, with variations up to 15%. Moreover, collection ports with inward-pointing sharp angles demonstrate the highest particle force coefficients, while those with outward-pointing angles show the lowest, exhibiting variations up to 23%. These results indicate that optimizing collection port design through wall thickness and shape modifications can improve particle collection efficiency, enhancing practical applications.