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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 (Avtor), ID Dular, Matevž (Avtor)

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Izvleček
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 δ and their size ratio ς. 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.

Jezik:Angleški jezik
Ključne besede:bubble dynamics, cavitation, bacteria, fluid–structure interaction, water treatment
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2022
Št. strani:20 str.
Številčenje:Vol. 87, art. 106053
PID:20.500.12556/RUL-137340 Povezava se odpre v novem oknu
UDK:532.528
ISSN pri članku:1350-4177
DOI:10.1016/j.ultsonch.2022.106053 Povezava se odpre v novem oknu
COBISS.SI-ID:111333891 Povezava se odpre v novem oknu
Datum objave v RUL:13.06.2022
Število ogledov:518
Število prenosov:122
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Gradivo je del revije

Naslov:Ultrasonics sonochemistry
Skrajšan naslov:Ultrason. sonochem.
Založnik:Elsevier
ISSN:1350-4177
COBISS.SI-ID:707668 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:dinamika mehurčkov, kavitacija, bakterije, interakcija fluid – struktura, čiščenje vode

Projekti

Financer:EC - European Commission
Program financ.:H2020
Številka projekta:771567
Naslov:An investigation of the mechanisms at the interaction between cavitation bubbles and contaminants
Akronim:CABUM

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0422
Naslov:Funkcionalne tekočine za napredne energetske sisteme

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:J2-3057
Naslov:Kontrolirano generiranje mikromehurčkov in raziskave njihove fizike za uporabo v kemiji, biologiji in medicini

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