broken symmetry conditions and a planar jet formation
Jaka Mur (Avtor), Vid Agrež (Avtor), Jure Zevnik (Avtor), Rok Petkovšek (Avtor), Matevž Dular (Avtor)

Povzetek

The collapse of microbubbles near a fiber is an example often encountered in water treatment situations and cavitation fibrillation processes. However, due to the broken symmetry conditions, this process has not been studied in detail experimentally or numerically, making it difficult to precisely measure or simulate the rapid bubble evolution during collapse. In this work, we present a novel experimental method, allowing for precisely repeatable cavitation events observation, combined with numerical simulations offering insight into pressure and velocity fields distribution developments in time. Both experimental and numerical works focused on small distances between the bubble and the fiber, where the physical interaction between subjects is the strongest. Four different bubble offsets were considered within the scope of this work, and very good agreement of numerical simulations with experiments was found in all cases. Two modes of bubble collapse were identified, leading to mushroom-shaped bubbles at positions closest to the fiber and a pear-shaped bubble at the farthest position. It is noteworthy that in all four cases, a planar jet formation toward the fiber was observed. The formed jet initially assumes an elongated shape, whereas its stability depends on the mode of bubble collapse. Numerical analysis of the planar jet as the defining feature of the collapse defined lower bounds for the actual values of peak jet velocities, ranging between 250 and 330 m/s, and the resulting impact pressures, which range from 100to 500 MPa.

Ključne besede

microbubbles;numerical analysis;cavitation;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FS - Fakulteta za strojništvo
UDK: 532:519.62
COBISS: 141080067 Povezava se bo odprla v novem oknu
ISSN: 1070-6631
Št. ogledov: 36
Št. prenosov: 1
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: mikro mehurčki;numerične analize;kavitacija;
Vrsta dela (COBISS): Članek v reviji
Strani: str. 1-15
Letnik: ǂVol. ǂ35
Zvezek: ǂiss. ǂ2
Čas izdaje: Feb. 2023
DOI: 10.1063/5.0136353
ID: 17962636