TY - JOUR
T1 - Computational study of the dynamics of two interacting bubbles in a megasonic field
AU - Ochiai, Naoya
AU - Ishimoto, Jun
N1 - Funding Information:
The part of this work was supported by JSPS Grant-in-Aid for Young Scientists B ( 26820038 ). This research was supported by a Support Program for Interdisciplinary Research Institute for Interdisciplinary Science (FRIS), Tohoku University. This work was partly supported by the Collaborative Research Project of the Institute of Fluid Science, Tohoku University. The numerical simulations were performed using the SGI Altix UV1000 and UV2000 scalar parallel computers at the Institute of Fluid Science, Tohoku University.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Clarification of the mechanism of particle removal by megasonic cleaning and control of cavitation bubbles in the megasonic field are essential for cleaning of nanodevices without pattern damage. Multiple bubble interactions complicate the mechanism of particle removal. Therefore, it is important to understand multiple bubble dynamics to clarify the mechanism of particle removal by megasonic cleaning. In the present study, the dynamics of two bubbles in a megasonic field with several initial radii and initial separation distances were simulated by numerical analysis using a compressible locally homogeneous model of a gas-liquid two-phase medium. The present numerical method simulated the various complex behaviors of two bubbles, which are repulsive motion, coalescence, periodic and stable motion of the separation distance, and bubble breakup. The initial separation distance strongly affected the behavior of the two bubbles because the effect of the secondary pressure induced by the oscillation of one bubble on the other bubble depends on the separation distance. In particular, when the equilibrium radii are larger than the resonant radius and the radius of one or both bubbles is close to the resonant radius, the bubbles can show characteristic behaviors, such as periodic and stable motion of the separation distance.
AB - Clarification of the mechanism of particle removal by megasonic cleaning and control of cavitation bubbles in the megasonic field are essential for cleaning of nanodevices without pattern damage. Multiple bubble interactions complicate the mechanism of particle removal. Therefore, it is important to understand multiple bubble dynamics to clarify the mechanism of particle removal by megasonic cleaning. In the present study, the dynamics of two bubbles in a megasonic field with several initial radii and initial separation distances were simulated by numerical analysis using a compressible locally homogeneous model of a gas-liquid two-phase medium. The present numerical method simulated the various complex behaviors of two bubbles, which are repulsive motion, coalescence, periodic and stable motion of the separation distance, and bubble breakup. The initial separation distance strongly affected the behavior of the two bubbles because the effect of the secondary pressure induced by the oscillation of one bubble on the other bubble depends on the separation distance. In particular, when the equilibrium radii are larger than the resonant radius and the radius of one or both bubbles is close to the resonant radius, the bubbles can show characteristic behaviors, such as periodic and stable motion of the separation distance.
KW - Bjerknes force
KW - Bubble breakup
KW - Bubble-bubble interaction
KW - Megasonic cavitation
KW - Numerical simulation
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U2 - 10.1016/j.ultsonch.2015.04.005
DO - 10.1016/j.ultsonch.2015.04.005
M3 - Article
AN - SCOPUS:84937762175
VL - 26
SP - 351
EP - 360
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
SN - 1350-4177
ER -