We focus on dynamics of multiple air bubbles exposed to acoustic pressure field while ascending in water. The bubbles are injected into the pool filled with water from a vertical capillary tube, and then the acoustic wave of designated frequency is applied toward the bubbles. The frequency of the acoustic wave is varied from 0.5 to 20 kHz. Volume and shape oscillations of the bubbles are captured by a high-speed camera at frame rates up to 40000 fps with a back-lighting system. Through this system, we succeed in capturing the dynamics of the axisymmetric shape oscillation with a distinct mode number; the bubble exhibits the volume oscillation first with a fundamental frequency f0, and then the gradual transition to the shape oscillation with a fundamental frequency fnm takes place. We evaluate the correlation through the careful observations between the f0 and fnm as f0 ∼ 2.1fnm, which brings almost perfectly confirmation of the prediction through the preceding theoretical works. We also indicate the criterion of the excitation of the shape oscillation by varying the frequencies of the adding pressure field.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4938-5
PROCEEDINGS PAPER
Shape Oscillation of Bubble(s) in Acoustic Field
Ichiro Ueno,
Ichiro Ueno
Tokyo University of Science, Noda, Chiba, Japan
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Keishi Matsumoto,
Keishi Matsumoto
Tokyo University of Science, Noda, Chiba, Japan
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Atsumi Machida,
Atsumi Machida
Tokyo University of Science, Noda, Chiba, Japan
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Tsuyoshi Hanyu
Tsuyoshi Hanyu
Tokyo University of Science, Noda, Chiba, Japan
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Ichiro Ueno
Tokyo University of Science, Noda, Chiba, Japan
Keishi Matsumoto
Tokyo University of Science, Noda, Chiba, Japan
Atsumi Machida
Tokyo University of Science, Noda, Chiba, Japan
Tsuyoshi Hanyu
Tokyo University of Science, Noda, Chiba, Japan
Paper No:
IHTC14-22636, pp. 923-927; 5 pages
Published Online:
March 1, 2011
Citation
Ueno, I, Matsumoto, K, Machida, A, & Hanyu, T. "Shape Oscillation of Bubble(s) in Acoustic Field." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 3. Washington, DC, USA. August 8–13, 2010. pp. 923-927. ASME. https://doi.org/10.1115/IHTC14-22636
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