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Optic generation and perpetuation of acoustic bubble clusters
ID
Mur, Jaka
(
Author
),
ID
Reuter, Fabian
(
Author
),
ID
Agrež, Vid
(
Author
),
ID
Petkovšek, Rok
(
Author
),
ID
Ohl, Claus-Dieter
(
Author
)
URL - Source URL, Visit
https://www.sciencedirect.com/science/article/pii/S1350417724002712
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Abstract
Laser-induced cavitation bubbles offer precise control of the flow in space and time, but they are rarely used for the mechanical and chemical processing of liquids. Instead, strong acoustic fields are commonly used to nucleate and drive cavitation bubbles for liquid process applications. While acoustic field creates many more cavitation events, the resulting chaotic dynamics offers little control on the fluid mechanics, i.e., where and how bubbles deliver their energy. Here we present a method that utilizes a laser to nucleate a single cavitation bubble, which is then driven into violent oscillations by the ultrasound field, resulting in splitting of the bubble followed by formation of a cluster of cavitation bubbles. This combination offers means for cavitation control not available in conventional acoustic cavitation. Here, the cavitation bubble is generated with a custom build pulsed laser that is focused below a sonotrode driven at 20 kHz. In absence of the acoustic driving the bubble reaches a maximum diameter of 130 µm with a lifetime of approximately 10 µs. In the presence of the acoustic field the first few expansions and bubble collapses are strongly affected by the phase of nucleation. Over successive acoustic cycles a small bubble cluster develops that loses its connection with the phase of generation. We study the dynamics in the free field and constrained by a rigid boundary. For both geometries the cluster over many acoustic cycles dies off, yet through repetitive optical bubble seeding the cluster lifetime and its location can be controlled.
Language:
English
Keywords:
laser induced cavitation
,
bubble clusters
,
acoustic 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:
2024
Number of pages:
9 str.
Numbering:
Vol. 110 , art. 107023
PID:
20.500.12556/RUL-160167
UDC:
535
ISSN on article:
1350-4177
DOI:
10.1016/j.ultsonch.2024.107023
COBISS.SI-ID:
204956419
Publication date in RUL:
22.08.2024
Views:
29
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4
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Record is a part of a journal
Title:
Ultrasonics Sonochemistry
Shortened title:
Ultrason. sonochem.
Publisher:
Butterworth-Heinemann, Elsevier Science
ISSN:
1350-4177
COBISS.SI-ID:
707668
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
lasersko povzročena kavitacija
,
oblak mehurčkov
,
akustična kavitacija
Projects
Funder:
Other - Other funder or multiple funders
Funding programme:
German Ministry for Education and Research (BMBF)
Project number:
57656970
Name:
Programm des Projektbezogenen Personenaustauschs Slowenien 2023–2025
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
P2-0270
Name:
Proizvodni sistemi, laserske tehnologije in spajanje materialov
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
L2-3171
Name:
Generacija ultrakratkih laserskih pulzov za zelo hitro in visoko prilagodljivo vzporedno mikro-procesiranje
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