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Cavitation bubble interaction with compliant structures on a microscale : a contribution to the understanding of bacterial cell lysis by cavitation treatment
ID Zevnik, Jure (Author), ID Dular, Matevž (Author)

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Abstract
Numerous studies have already shown that the process of cavitation can be successfully used for water treatment and eradication of bacteria. However, most of the relevant studies are being conducted on a macro scale, so the understanding of the processes at a fundamental level remains poor. In attempt to further elucidate the process of cavitation-assisted water treatment on a scale of a single bubble, the present paper numerically addresses interaction between a collapsing microbubble and a nearby compliant structure, that mechanically and structurally resembles a bacterial cell. A fluid–structure interaction methodology is employed, where compressible multiphase flow is considered and the bacterial cell wall is modeled as a multi-layered shell structure. Simulations are performed for two selected model structures, each resembling the main structural features of Gram-negative and Gram-positive bacterial cell envelopes. The contribution of two independent dimensionless geometric parameters is investigated, namely the bubble-cell distance and their size ratio . Three characteristic modes of bubble collapse dynamics and four modes of spatiotemporal occurrence of peak local stresses in the bacterial cell membrane are identified throughout the parameter space considered. The former range from the development of a weak and thin jet away from the cell to spherical bubble collapses. The results show that local stresses arising from bubble-induced loads can exceed poration thresholds of cell membranes and that bacterial cell damage could be explained solely by mechanical effects in absence of thermal and chemical ones. Based on this, the damage potential of a single microbubble for bacteria eradication is estimated, showing a higher resistance of the Gram-positive model organism to the nearby bubble collapse. Microstreaming is identified as the primary mechanical mechanism of bacterial cell damage, which in certain cases may be enhanced by the occurrence of shock waves during bubble collapse. The results are also discussed in the scope of bacteria eradication by cavitation treatment on a macro scale, where processes of hydrodynamic and ultrasonic cavitation are being employed.

Language:English
Keywords:bubble dynamics, cavitation, bacteria, fluid–structure interaction, water treatment
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2022
Publication status in journal:Published
Article version:Publisher's version of article
Publication date:02.06.2022
Number of pages:20 str.
Numbering:Vol. 87, art. 106053
PID:20.500.12556/RUL-137340 This link opens in a new window
UDC:532.528
ISSN on article:1350-4177
DOI:10.1016/j.ultsonch.2022.106053 This link opens in a new window
COBISS.SI-ID:111333891 This link opens in a new window
Publication date in RUL:13.06.2022
Views:73
Downloads:38
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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.
Licensing start date:02.06.2022
Applies to:Available online

Secondary language

Language:Slovenian
Keywords:dinamika mehurčkov, kavitacija, bakterije, interakcija fluid-struktura, čiščenje vode

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 - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0422
Name:Funkcionalne tekočine za napredne energetske sisteme

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:J2-3057
Name:Kontrolirano generiranje mikromehurčkov in raziskave njihove fizike za uporabo v kemiji, biologiji in medicini.

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