TY - JOUR
T1 - Liquid jet directionality and droplet behavior during emulsification of two liquids due to acoustic cavitation
AU - Yamamoto, Takuya
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 JSPS KAKENHI Grant Number JP17K18969, partly by Kurita water and environment foundation, and partly by Nippon Steel corporation.
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 JSPS KAKENHI Grant Number JP17K18969 , partly by Kurita water and environment foundation, and partly by Nippon Steel corporation. Appendix A
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/4
Y1 - 2020/4
N2 - The present study numerically investigates liquid-jet characteristics of acoustic cavitation during emulsification in water/gallium/air and water/silicone oil/air systems. It is found that a high-speed liquid jet is generated when acoustic cavitation occurs near a minute droplet of one liquid in another. The velocity of liquid jet significantly depends on the ultrasonic pressure monotonically increasing as the pressure amplitude increases. Also, the initial distance between cavitation bubble and liquid droplet affects the jet velocity significantly. The results revealed that the velocity takes maximum values when the initial distance between the droplet and cavitation bubble is moderate. Surprisingly, the liquid jet direction was found to depend on the droplet properties. Specifically, the direction of liquid jet is toward the droplet in the case of water/gallium/air system, and vice versa the jet is directed from the droplet in the case of water/silicone oil/air system. The jet directionality can be explained by location of the high-pressure spot generated during the bubble contraction.
AB - The present study numerically investigates liquid-jet characteristics of acoustic cavitation during emulsification in water/gallium/air and water/silicone oil/air systems. It is found that a high-speed liquid jet is generated when acoustic cavitation occurs near a minute droplet of one liquid in another. The velocity of liquid jet significantly depends on the ultrasonic pressure monotonically increasing as the pressure amplitude increases. Also, the initial distance between cavitation bubble and liquid droplet affects the jet velocity significantly. The results revealed that the velocity takes maximum values when the initial distance between the droplet and cavitation bubble is moderate. Surprisingly, the liquid jet direction was found to depend on the droplet properties. Specifically, the direction of liquid jet is toward the droplet in the case of water/gallium/air system, and vice versa the jet is directed from the droplet in the case of water/silicone oil/air system. The jet directionality can be explained by location of the high-pressure spot generated during the bubble contraction.
KW - Acoustic cavitation
KW - Emulsification
KW - Non-linear oscillation
KW - OpenFOAM
KW - Three-Phases Volume of Fluid (TP-VOF) method
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U2 - 10.1016/j.ultsonch.2019.104874
DO - 10.1016/j.ultsonch.2019.104874
M3 - Article
C2 - 31810876
AN - SCOPUS:85076513301
SN - 1350-4177
VL - 62
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
M1 - 104874
ER -