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Cavitation bubble collapse in a vicinity of a liquid-liquid interface : basic research into emulsification process
ID Orthaber, Uroš (Author), ID Zevnik, Jure (Author), ID Petkovšek, Rok (Author), ID Dular, Matevž (Author)

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Abstract
The initial motivation for the study was to gain deeper understanding into the background of emulsion preparation by ultrasound (cavitation). In our previous work (Perdih et al., 2019) we observed rich phenomena occurring near the liquid-liquid interface which was exposed to ultrasonic cavitation. Although numerous studies of bubble dynamics in different environments (presence of free surface, solid body, shear flow and even variable gravity field) exist, one can find almost no reports on the interaction of a bubble with a liquid-liquid interface. In the present work we conducted a number of experiments where single cavitation bubble dynamics was observed on each side of the oil-water interface. These were accompanied by corresponding simulations. We investigated the details of bubble interface interaction (deformation, penetration). As predicted, by the anisotropy parameter the bubble always jets toward the interface if it grows in the lighter liquid and correspondingly away from the interface if it is initiated inside the denser liquid. We extended the analysis to the relationships of various bubble characteristics and the anisotropy parameter. Finally, based on the present and our previous study (Perdih et al., 2019), we offer new insights into the physics of ultrasonic emulsification process.

Language:English
Keywords:cavitation, liquid-liquid interface, bubble, oil, emulsion, simulation
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:15 str.
Numbering:Vol. 68, art. 105224
PID:20.500.12556/RUL-116997 This link opens in a new window
UDC:532.528(045)
ISSN on article:1350-4177
DOI:10.1016/j.ultsonch.2020.105224 This link opens in a new window
COBISS.SI-ID:20084995 This link opens in a new window
Publication date in RUL:18.06.2020
Views:611
Downloads:354
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Record is a part of a journal

Title:Ultrasonics sonochemistry
Shortened title:Ultrason. sonochem.
Publisher:Elsevier
ISSN:1350-4177
COBISS.SI-ID:707668 This link opens in a new window

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:kavitacija, mehurčki, emulzija

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:P2-0401
Name:Energetsko strojništvo

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:P2-0270
Name:Proizvodni sistemi, laserske tehnologije in spajanje materialov

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:BI-US/18-19-031

Funder:Drugi - Drug financer ali več financerjev
Funding programme:Ministry of Education, Science and Sport
Project number:C-3330-17-529029

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

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