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Liquid jet directionality and droplet behavior during emulsification of two liquids due to acoustic cavitation.

Authors :
Yamamoto, Takuya
Komarov, Sergey V.
Source :
Ultrasonics Sonochemistry. Apr2020, Vol. 62, pN.PAG-N.PAG. 1p.
Publication Year :
2020

Abstract

• A liquid jet of acoustic cavitation near a droplet was investigated numerically. • The liquid-jet strength becomes strong with increase of ultrasonic pressure amplitude. • The liquid-jet direction depends on the material of droplet. • The directionality of liquid jet can be explained by the location of high-pressure spot. 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13504177
Volume :
62
Database :
Academic Search Index
Journal :
Ultrasonics Sonochemistry
Publication Type :
Academic Journal
Accession number :
141343444
Full Text :
https://doi.org/10.1016/j.ultsonch.2019.104874