Matej Senegačnik (Avtor), Kohei Kunimoto (Avtor), Satoshi Yamaguchi (Avtor), Koki Kimura (Avtor), Tetsuo Sakka (Avtor), Peter Gregorčič (Avtor)

Povzetek

Laser ablation in liquids is growing in popularity for various applications including nanoparticle production, breakdown spectroscopy, and surface functionalization. When laser pulse ablates the solid target submerged in liquid, a cavitation bubble develops. In case of "finite" geometries of ablated solids, liquid dynamical phenomena can occur inside the bubble when the bubble overflows the surface edge. To observe this dynamics, we use diffuse illumination of a flashlamp in combination with a high-speed videography by exposure times down to 250 ns. The developed theoretical modelling and its comparison with the experimental observations clearly prove that this approach widens the observable area inside the bubble. We thereby use it to study the dynamics of laser-induced cavitation bubble during its expansion over a sharp-edge ("cliff-like" 90°) geometry submerged in water, ethanol, and polyethylene glycol 300. The samples are 17 mm wide stainless steel plates with thickness in the range of 0.025-2 mm. Bubbles are induced on the samples by 1064-nm laser pulses with pulse durations of 7-60 ns and pulse energies of 10-55 mJ. We observe formation of a fixed-type secondary cavity behind the edge where low-pressure area develops due to bubble-driven flow of the liquid. This occurs when the velocity of liquid overflow exceeds [app.] 20 m s-1. A re-entrant liquid injection with up to [app.] 40 m s-1 velocity may occur inside the bubble when the bubble overflows the edge of the sample. Formation and characteristics of the jet evidently depend on the relation between the breakdown-edge offset and the bubble energy, as well as the properties of the surrounding liquid. Higher viscosity of the liquid prevents the generation of the jet.

Ključne besede

laser ablation in liquids;cavitation;bubbleshadowgraphy;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FS - Fakulteta za strojništvo
UDK: 532.528:681.7.069.24(045)
COBISS: 46704131 Povezava se bo odprla v novem oknu
ISSN: 1350-4177
Št. ogledov: 326
Št. prenosov: 173
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: laserska ablacija v kapljevinah;kavitacijski mehurček;senčna fotografija;
Vrsta dela (COBISS): Članek v reviji
Strani: str. 1-16
Zvezek: ǂVol. ǂ73
Čas izdaje: May 2021
DOI: 10.1016/j.ultsonch.2021.105460
ID: 12692807