Laser-induced cavitation bubble interaction with surface-attached bubbles

Agrež, Vid (avtor), Lokar, Žiga (avtor), Petkovšek, Rok (avtor), Ohl, Claus-Dieter (avtor)

We study the interaction of laser-induced cavitation bubbles generated atop an electrode covered with hydrogen bubbles. The bubbles respond to the shock wave from laser-induced breakdown and the flow field of expanding and collapsing cavitation bubbles. High-speed imaging reveals that both the shock wave and subsequent flow contribute to bubble detachment and electrode clearance. Clearance occurs within an approximately circular area exceeding 3 times the maximum bubble radius, with partial clearance extending to 5 times this radius, which is considerably larger than reported for particulate or liquid contaminant removal. The initial shock wave propagates as a void fraction wave upon reaching the bubbles, producing radially propagating bubble disturbance with velocities ranging from 490 m/s at low bubble concentrations to 50 m/s at high concentrations. These speeds are within the range expected for linear waves in bubbly liquids according to Wood’s formula. Bubble removal persists for 10 ms, approximately 100 times longer than the cavitation bubble lifetime, which is attributed to long-lasting vortical flow generated by non-spherical cavitation bubble collapse. The findings may help to improve the removal of particulate contaminants as well as reducing ohmic loads in electrolyzers.

• Jezik: Angleški jezik
• Ključne besede: laser-induced cavitation, surface cleaning, bubble removal, shockwave, void fraction wave
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 10 str.
• Številčenje: Vol. 728, art. 166122
• PID: 20.500.12556/RUL-179049
• UDK: 532.528:544.537
• ISSN pri članku: 0169-4332
• DOI: 10.1016/j.apsusc.2026.166122
• COBISS.SI-ID: 267287299
• Datum objave v RUL: 04.02.2026

Gradivo je del revije

• Naslov: Applied Surface Science
• Skrajšan naslov: Appl. surf. sci.
• Založnik: North-Holland
• ISSN: 0169-4332
• COBISS.SI-ID: 3283215

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: lasersko povzročena kavitacija, čiščenje površin, odstranjevanje mehurčkov, udarni valovi, val deleža praznin

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0270
• Naslov: Proizvodni sistemi, laserske tehnologije in spajanje materialov

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: Deutsche Forschungsgemeinschaft
• Številka projekta: ME 1645/12-1