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<p>In this paper, the dynamic characteristics of a vertical vortex are examined by the theoretical method and the particle image velocimetry (PIV) technology. The results of the theoretical analysis validate that the main parameters of the vertical vortex are the Reynolds number <i>Re</i>, water level <i>WL*</i> and velocity circulation <i>Γ</i><sub><i>N</i></sub>. The experimental results indicate that, for the same <i>Re</i>, the low water levels are responsible for an intensive vortex intensity (maximum vorticity), but for a high-water level, water level is no longer a significant influencing factor on vortex intensity. The <i>Γ</i><sub><i>N</i></sub> number increases with the rising of the Reynolds number <i>Re</i> and drops with the height of measurement section enhance for a low water level case. For the higher <i>WL*, Γ</i><sub><i>N</i></sub> does not decrease significantly. The formation and evolution of the vertical vortex in the present paper can be utilized or restrained by controlling the relevant dynamic parameters. Obtained research results may provide an important reference for engineering applications with possible occurrence of vertical vortex phenomenon.</p>

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Experimental hydraulic characteristics of a reverse vertical vortex within a vertical outlet pipe

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Miao Guo,
  • Zi-hao Huang,
  • Yan Shen,
  • Wei Wang,
  • Xiao-qin Li,
  • Xue-lin Tang

摘要

In this paper, the dynamic characteristics of a vertical vortex are examined by the theoretical method and the particle image velocimetry (PIV) technology. The results of the theoretical analysis validate that the main parameters of the vertical vortex are the Reynolds number Re, water level WL* and velocity circulation ΓN. The experimental results indicate that, for the same Re, the low water levels are responsible for an intensive vortex intensity (maximum vorticity), but for a high-water level, water level is no longer a significant influencing factor on vortex intensity. The ΓN number increases with the rising of the Reynolds number Re and drops with the height of measurement section enhance for a low water level case. For the higher WL*, ΓN does not decrease significantly. The formation and evolution of the vertical vortex in the present paper can be utilized or restrained by controlling the relevant dynamic parameters. Obtained research results may provide an important reference for engineering applications with possible occurrence of vertical vortex phenomenon.