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Microbubble collapse near a fiber : broken symmetry conditions and a planar jet formation
ID
Mur, Jaka
(
Author
),
ID
Agrež, Vid
(
Author
),
ID
Zevnik, Jure
(
Author
),
ID
Petkovšek, Rok
(
Author
),
ID
Dular, Matevž
(
Author
)
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https://aip.scitation.org/doi/10.1063/5.0136353
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Abstract
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.
Language:
English
Keywords:
microbubbles
,
numerical analysis
,
cavitation
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2023
Number of pages:
15 str.
Numbering:
Vol. 35, iss. 2, art. 023305
PID:
20.500.12556/RUL-144279
UDC:
532:519.62
ISSN on article:
1070-6631
DOI:
10.1063/5.0136353
COBISS.SI-ID:
141080067
Publication date in RUL:
09.02.2023
Views:
8317
Downloads:
80
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Record is a part of a journal
Title:
Physics of fluids
Shortened title:
Phys. fluids
Publisher:
American Institute of Physics
ISSN:
1070-6631
COBISS.SI-ID:
37828865
Licences
License:
CC BY 4.0, Creative Commons Attribution 4.0 International
Link:
http://creativecommons.org/licenses/by/4.0/
Description:
This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Secondary language
Language:
Slovenian
Keywords:
mikro mehurčki
,
numerične analize
,
kavitacija
Projects
Funder:
EC - European Commission
Funding programme:
H2020
Project number:
771567
Name:
An investigation of the mechanisms at the interaction between cavitation bubbles and contaminants
Acronym:
CABUM
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0422
Name:
Funkcionalne tekočine za napredne energetske sisteme
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0270
Name:
Proizvodni sistemi, laserske tehnologije in spajanje materialov
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-3057
Name:
Kontrolirano generiranje mikromehurčkov in raziskave njihove fizike za uporabo v kemiji, biologiji in medicini.
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