Experimental and Theoretical Studies on the Movements of Two Bubbles in an Acoustic Standing Wave Field
Jiao, J, He, Y, Leong, T, Kentish, SE, Ashokkumar, M, Manasseh, R and Lee, J (2013) Experimental and Theoretical Studies on the Movements of Two Bubbles in an Acoustic Standing Wave Field The Journal of Physical Chemistry Part B, 117 (41). pp. 12549-12555.
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When subjected to an ultrasonic standing-wave field, cavitation bubbles smaller than the resonance size migrate to the pressure antinodes. As bubbles approach the antinode, they also move toward each other and either form a cluster or coalesce. In this study, the translational trajectory of two bubbles moving toward each other in an ultrasonic standing wave at 22.4 kHz was observed using an imaging system with a high-speed video camera. This allowed the speed of the approaching bubbles to be measured for much closer distances than those reported in the prior literature. The trajectory of two approaching bubbles was modeled using coupled equations of radial and translational motions, showing similar trends with the experimental results. We also indirectly measured the secondary Bjerknes force by monitoring the acceleration when bubbles are close to each other under different acoustic pressure amplitudes. Bubbles begin to accelerate toward each other as the distance between them gets shorter, and this acceleration increases with increasing acoustic pressure. The current study provides experimental data that validates the theory on the movement of bubbles and forces acting between them in an acoustic field that will be useful in understanding bubble coalescence in an acoustic field.
|Subjects :||Chemical and Process Engineering|
|Divisions :||Faculty of Engineering and Physical Sciences > Chemical and Process Engineering|
|Date :||17 October 2013|
|Identification Number :||https://doi.org/10.1021/jp404886h|
|Copyright Disclaimer :||© 2013 American Chemical Society|
|Uncontrolled Keywords :||Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, CHEMISTRY, PHYSICAL, BJERKNES FORCES, SOUND FIELD, GAS-BUBBLES, SONOLUMINESCENCE, DYNAMICS, MICROBUBBLES, ULTRASOUND, SURFACE, LIQUID, LATEX|
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|Additional Information :||Item not available from this repository|
|Depositing User :||Symplectic Elements|
|Date Deposited :||19 Jul 2016 14:46|
|Last Modified :||19 Jul 2016 14:46|
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