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Cavitation bubble interaction with a rigid spherical particle on a microscale
ID
Zevnik, Jure
(
Avtor
),
ID
Dular, Matevž
(
Avtor
)
PDF - Predstavitvena datoteka,
prenos
(2,44 MB)
MD5: BA2F3BF248F3BE29CF13FB666E2BFDA0
URL - Izvorni URL, za dostop obiščite
https://www.sciencedirect.com/science/article/pii/S135041772030626X
Galerija slik
Izvleček
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.
Jezik:
Angleški jezik
Ključne besede:
bubble dynamics
,
cavitation
,
fluid–solid interaction
,
shock wave emission
,
bacteria eradication
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:
2020
Št. strani:
13 str.
Številčenje:
Vol. 69, art. 105252
PID:
20.500.12556/RUL-117662
UDK:
532.528(045)
ISSN pri članku:
1350-4177
DOI:
10.1016/j.ultsonch.2020.105252
COBISS.SI-ID:
22788355
Datum objave v RUL:
20.07.2020
Število ogledov:
1497
Število prenosov:
565
Metapodatki:
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Objavi na:
Gradivo je del revije
Naslov:
Ultrasonics Sonochemistry
Skrajšan naslov:
Ultrason. sonochem.
Založnik:
Butterworth-Heinemann, Elsevier Science
ISSN:
1350-4177
COBISS.SI-ID:
707668
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
,
interakcija fluid – trdnina
,
emisija udarnih valov
,
uničevanje bakterij
Projekti
Financer:
ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:
P2-0401
Naslov:
Energetsko strojništvo
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
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