Bubble collapse near a wall. Part 1: An experimental study on the impact of shock waves and microjet on the wall pressure
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916350349279232 |
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| author | Subramanian, Roshan Kumar Yang, Zhidian Romanò, Francesco Coutier-Delgosha, Olivier |
| author_facet | Subramanian, Roshan Kumar Yang, Zhidian Romanò, Francesco Coutier-Delgosha, Olivier |
| contents | This study examines the pressure exerted by a cavitation bubble collapsing near a rigid wall. A laser-generated bubble in a water basin undergoes growth, collapse, second growth, and final collapse. Shock waves and liquid jets from non-spherical collapses are influenced by the stand-off ratio $γ$, defined as the bubble centroid distance from the wall divided by the bubble radius. We detail shock mechanisms, such as tip or torus collapse, for various $γ$ values. High-speed and Schlieren imaging visualize the microjet and shock waves. The microjet's evolution is tracked for large $γ$, while shock waves are captured in composite images showing multiple shock positions. Quantitative analyses of the microjet interface, shock wave velocities, and impact times are reported. Wall-mounted sensors and a needle hydrophone measure pressure and compare with high-speed observations to assess the dominant contributions to pressure changes with $γ$, revealing implications for cavitation erosion mechanisms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_03479 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Bubble collapse near a wall. Part 1: An experimental study on the impact of shock waves and microjet on the wall pressure Subramanian, Roshan Kumar Yang, Zhidian Romanò, Francesco Coutier-Delgosha, Olivier Fluid Dynamics This study examines the pressure exerted by a cavitation bubble collapsing near a rigid wall. A laser-generated bubble in a water basin undergoes growth, collapse, second growth, and final collapse. Shock waves and liquid jets from non-spherical collapses are influenced by the stand-off ratio $γ$, defined as the bubble centroid distance from the wall divided by the bubble radius. We detail shock mechanisms, such as tip or torus collapse, for various $γ$ values. High-speed and Schlieren imaging visualize the microjet and shock waves. The microjet's evolution is tracked for large $γ$, while shock waves are captured in composite images showing multiple shock positions. Quantitative analyses of the microjet interface, shock wave velocities, and impact times are reported. Wall-mounted sensors and a needle hydrophone measure pressure and compare with high-speed observations to assess the dominant contributions to pressure changes with $γ$, revealing implications for cavitation erosion mechanisms. |
| title | Bubble collapse near a wall. Part 1: An experimental study on the impact of shock waves and microjet on the wall pressure |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2408.03479 |