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Cavitation bubble interaction with a rigid spherical particle on a microscale
ID Zevnik, Jure (Author), ID Dular, Matevž (Author)

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Abstract
Cavitation bubble collapse close to a submerged sphere on a microscale is investigated numerically using a finite volume method in order to determine the likelihood of previously suspected mechanical effects to cause bacterial cell damage, such as impact of a high speed water jet, propagation of bubble emitted shock waves, shear loads, and thermal loads. A grid convergence study and validation of the employed axisymmetric numerical model against the Gilmore’s equation is performed for a case of a single microbubble collapse due to a sudden ambient pressure increase. Numerical simulations of bubble-sphere interaction corresponding to different values of nondimensional bubble-sphere standoff distance δ and their size ratio ε are carried out. The obtained results show vastly different bubble collapse dynamics across the considered parameter space, from the development of a fast thin annular jet towards the sphere to an almost spherical bubble collapse. Although some similarities in bubble shape progression to previous studies on larger bubbles exist, it can be noticed that bubble jetting is much less likely to occur on the considered scale due to the cushioning effects of surface tension on the intensity of the collapse. Overall, the results show that the mechanical loads on a spherical particle tend to increase with a sphere-bubble size ratio ε, and decrease with their distance δ. Additionally, the results are discussed with respect to bacteria eradication by hydrodynamic cavitation. Potentially harmful mechanical effects of bubble-sphere interaction on a micro scale are identified, namely the collapse-induced shear loads with peaks of a few megapascals and propagation of bubble emitted shock waves, which could cause spatially highly variable compressive loads with peaks of a few hundred megapascals and gradients of 100 MPa/μm.

Language:English
Keywords:bubble dynamics, cavitation, fluid–solid interaction, shock wave emission, bacteria eradication
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:13 str.
Numbering:Vol. 69, art. 105252
PID:20.500.12556/RUL-117662 This link opens in a new window
UDC:532.528(045)
ISSN on article:1350-4177
DOI:10.1016/j.ultsonch.2020.105252 This link opens in a new window
COBISS.SI-ID:22788355 This link opens in a new window
Publication date in RUL:20.07.2020
Views:495
Downloads:370
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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:dinamika mehurčkov, kavitacija, interakcija fluid – trdnina, emisija udarnih valov, uničevanje bakterij

Projects

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

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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