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<p>The motion of solid particles floating on a water surface driven by a point-sourced bubble plume was investigated experimentally. Particle image velocimetry and particle tracking velocimetry revealed that the particles moved more slowly than the surrounding water surface flow. In the most significant condition, the particle velocity was only about 50% of the surface flow velocity. This slowdown was attributed to gravity waves, generated by the periodic rise and fall of the water surface above the bubble plume, propagating on the water surface. The delay in particle transport is theoretically explained by the dynamic interaction between floating particles and vertical oscillation of liquid surfaces. Specifically, there is a back-slip motion of the particle due to the particle’s vertical displacement correlated to the liquid’s horizontal velocity fluctuation of the waves. The phenomenon was confirmed in two water containers of different sizes, and a mathematical model was proposed to predict floating debris’ transport across a broad range of conditions for practical applications.</p>

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Transport of floating debris on water surface flow driven by a bubble plume

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Yuichi Murai,
  • Takuya Wada,
  • Yasufumi Horimoto,
  • Hyun Jin Park,
  • Yuji Tasaka

摘要

The motion of solid particles floating on a water surface driven by a point-sourced bubble plume was investigated experimentally. Particle image velocimetry and particle tracking velocimetry revealed that the particles moved more slowly than the surrounding water surface flow. In the most significant condition, the particle velocity was only about 50% of the surface flow velocity. This slowdown was attributed to gravity waves, generated by the periodic rise and fall of the water surface above the bubble plume, propagating on the water surface. The delay in particle transport is theoretically explained by the dynamic interaction between floating particles and vertical oscillation of liquid surfaces. Specifically, there is a back-slip motion of the particle due to the particle’s vertical displacement correlated to the liquid’s horizontal velocity fluctuation of the waves. The phenomenon was confirmed in two water containers of different sizes, and a mathematical model was proposed to predict floating debris’ transport across a broad range of conditions for practical applications.