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<p>The present paper conducts experimental and theoretical analyses of the cavitation bubble dynamics near a semicylindrical protrusion within a confined space. Based on the conformal transformation, the image method, and the potential flow superposition theory, a Kelvin impulse model for the cylindrical bubble is established. By comparison with the experimental results, theoretical liquid velocity and Kelvin impulse results are obtained, reflecting the characteristics of the bubble collapse jet and centroid motion, which reveals the formation mechanism of the collapse jet. The main conclusions are summarized as follows: (1) When a bubble collapses near a semicylindrical protrusion, a pronounced asymmetric splitting phenomenon occurs, primarily caused by a high-speed jet directed toward the wall surface. (2) The theoretical liquid velocity distribution can effectively predict the bubble interface motion, which is the main reason for the formation of the collapse jet. (3) The Kelvin impulse can effectively predict the bubble centroid motion.</p>

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Dynamics of the bubble jet and centroid motion near a semicylindrical protrusion within confined spaces

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • Peng Luo,
  • Wen-da Liu,
  • Ting-ting Zhang,
  • Qi-hang Xu,
  • Kang-kang Li,
  • Dong-yang Zhang,
  • Jun-wei Shen,
  • Yu-ning Zhang

摘要

The present paper conducts experimental and theoretical analyses of the cavitation bubble dynamics near a semicylindrical protrusion within a confined space. Based on the conformal transformation, the image method, and the potential flow superposition theory, a Kelvin impulse model for the cylindrical bubble is established. By comparison with the experimental results, theoretical liquid velocity and Kelvin impulse results are obtained, reflecting the characteristics of the bubble collapse jet and centroid motion, which reveals the formation mechanism of the collapse jet. The main conclusions are summarized as follows: (1) When a bubble collapses near a semicylindrical protrusion, a pronounced asymmetric splitting phenomenon occurs, primarily caused by a high-speed jet directed toward the wall surface. (2) The theoretical liquid velocity distribution can effectively predict the bubble interface motion, which is the main reason for the formation of the collapse jet. (3) The Kelvin impulse can effectively predict the bubble centroid motion.