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Kelvin-Helmholtz instability as one of the key features for fast and efficient emulsification by hydrodynamic cavitation
ID
Boček, Žan
(
Author
),
ID
Petkovšek, Martin
(
Author
),
ID
Clark, Samuel J.
(
Author
),
ID
Fezzaa, Kamel
(
Author
),
ID
Dular, Matevž
(
Author
)
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MD5: 451F65401542EDCF77C479B4F5D9AAA7
URL - Source URL, Visit
https://www.sciencedirect.com/science/article/pii/S1350417724002189
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Abstract
The paper investigates the oil–water emulsification process inside a micro-venturi channel. More specifically, the possible influence of Kelvin-Helmholtz instability on the emulsification process. High-speed visualizations were conducted inside a square venturi constriction with throat dimensions of 450 µm by 450 µm, both under visible light and X-Rays. We show that cavity shedding caused by the instability results in the formation of several cavity vortices. Their rotation causes the deformation of the oil stream into a distinct wave-like shape, combined with fragmentation into larger drops due to cavitation bubble collapse. Later on, the cavity collapse further disperses the larger drops into a finer emulsion. Thus, it turns out that the Kelvin-Helmholtz instability is similarly characteristic for hydrodynamic cavitation emulsification inside a microchannel as is the Rayleigh-Taylor instability for acoustically driven emulsion formation.
Language:
English
Keywords:
emulsion
,
hydrodynamic cavitation
,
Kelvin-Helmholtz instability
,
Venturi microchannels
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. 108, art. 106970
PID:
20.500.12556/RUL-159634
UDC:
532.528
ISSN on article:
1350-4177
DOI:
10.1016/j.ultsonch.2024.106970
COBISS.SI-ID:
201951491
Publication date in RUL:
16.07.2024
Views:
135
Downloads:
7
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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:
emulzija
,
hidrodinamska kavitacija
,
Kelvin-Helmholtzova nestabilnost
,
Venturijevi mikrokanali
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:
ARIS - Slovenian Research and Innovation Agency
Project number:
P2-0401
Name:
Energetsko strojništvo
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
P2-0422
Name:
Funkcionalne tekočine za napredne energetske sisteme
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
J2-3044
Name:
Kontroliranje ekstremnih kavitacijskih pogojev z lasersko funkcionalizacijo površin (eCATS)
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
J2-3057
Name:
Kontrolirano generiranje mikromehurčkov in raziskave njihove fizike za uporabo v kemiji, biologiji in medicini.
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
J2-4480
Name:
Odstranjevanje izbranih protimikrobnih učinkovin s hibridno kavitacijsko-plazemsko tehnologijo iz vodnih matric različnih kompleksnosti (Causma)
Funder:
Other - Other funder or multiple funders
Funding programme:
Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory
Project number:
DE-AC02-06CH11357
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