Dynamics of laser-induced cavitation bubbles near two perpendicular rigid walls
| Autor: | Toshiyuki Ogasawara, Hiroyuki Takahira, Atsushi Ishigami, Tatsuya Noda, Emil-Alexandru Brujan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Toroid Mechanical Engineering Bubble 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Laser 01 natural sciences Radial direction Toroidal ring model 010305 fluids & plasmas law.invention Physics::Fluid Dynamics Mechanics of Materials law Cavitation 0103 physical sciences Perpendicular 0210 nano-technology Cavitation bubble |
| Zdroj: | Journal of Fluid Mechanics. 841:28-49 |
| ISSN: | 1469-7645 0022-1120 |
| DOI: | 10.1017/jfm.2018.82 |
| Popis: | The behaviour of a laser-induced cavitation bubble near two perpendicular rigid walls and its dependence on the distance between bubble and walls is investigated experimentally. It was shown by means of high-speed photography with $100\,000~\text{frames}~\text{s}^{-1}$ that an inclined jet is formed during bubble collapse and the bubble migrates in the direction of the jet. At a given position of the bubble with respect to the horizontal wall, the inclination of the jet increases with decreasing distance between the bubble and the second, vertical wall. A bubble generated at equal distances from the walls develops a jet that is directed in their bisection. The penetration of the jet into the opposite bubble surface leads to the formation of an asymmetric toroidal bubble that is perpendicular to the jet direction. At a large distance from the rigid walls, the toroidal bubble collapses in the radial direction, eventually disintegrating into tiny microbubbles. When the bubble is in contact with the horizontal wall at its maximum expansion, the toroidal ring collapses in both radial and toroidal directions, starting from the bubble part opposite to the vertical wall, and the bubble achieves a crescent shape at the moment of second collapse. The bubble oscillation is accompanied by a strong migration along the horizontal wall. |
| Databáze: | OpenAIRE |
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