TY - JOUR
T1 - Fragmentation of cavitation bubble in ultrasound field under small pressure amplitude
AU - Yamamoto, Takuya
AU - Hatanaka, Shin ichi
AU - Komarov, Sergey V.
N1 - Funding Information:
The present research is supported partly by Initiative on Promotion of Supercomputing for Young or Women Researchers, Supercomputing Division, Information Technology Center, The University of Tokyo , partly by Kurita water and environment foundation , and partly by Nippon Steel & Sumitomo Metal Corporation (NSSMC) Group. Appendix A
PY - 2019/11
Y1 - 2019/11
N2 - In the present study, dynamic behavior and fragmentation mechanism of acoustic cavitation bubbles are investigated under relatively small pressure amplitudes of ultrasonic wave through a three-dimensional compressive multiphase flow simulation and experimental observations. It is found that the oscillating bubble takes a non-spherical shape soon after occurring the Rayleigh collapse following the sound pressure distribution around the bubble. Then, the amplitude of non-spherical deformation is enhanced during small high-frequent oscillations after the Rayleigh collapse due to the fluid inertial effect. Finally, the oscillating bubble is fragmented into two smaller ones with the Laplace pressure gradient becoming the final trigger of bubble fragmentation. Besides, the results reveal that the temperature of bubble surface is varied when the non-spherical bubble deformation is large, while during spherical bubble oscillations the surface temperature remains almost unchanged.
AB - In the present study, dynamic behavior and fragmentation mechanism of acoustic cavitation bubbles are investigated under relatively small pressure amplitudes of ultrasonic wave through a three-dimensional compressive multiphase flow simulation and experimental observations. It is found that the oscillating bubble takes a non-spherical shape soon after occurring the Rayleigh collapse following the sound pressure distribution around the bubble. Then, the amplitude of non-spherical deformation is enhanced during small high-frequent oscillations after the Rayleigh collapse due to the fluid inertial effect. Finally, the oscillating bubble is fragmented into two smaller ones with the Laplace pressure gradient becoming the final trigger of bubble fragmentation. Besides, the results reveal that the temperature of bubble surface is varied when the non-spherical bubble deformation is large, while during spherical bubble oscillations the surface temperature remains almost unchanged.
KW - Acoustic cavitation
KW - Bubble fragmentation
KW - Non-linear oscillation
KW - Volume of fluid (VOF) method
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U2 - 10.1016/j.ultsonch.2019.104684
DO - 10.1016/j.ultsonch.2019.104684
M3 - Article
C2 - 31450353
AN - SCOPUS:85069691753
VL - 58
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
SN - 1350-4177
M1 - 104684
ER -