Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4979087
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Funding
- National Natural Science Foundation of China [51301139, 11404243]
- Shaanxi Provincial Natural Science Foundation [2016JM1003]
- Fundamental Research Funds for the Central Universities [3102016ZY026]
- Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University [Z2016159]
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We report on the behavior of levitated soap bubbles in a single-axis acoustic field. For a single bubble, its surface in the polar regions is under compression, but in the equatorial region, it is under suction. Levitation becomes unstable when the height of the bubble approaches half the wavelength of the sound wave because horizontal fluctuations lead to a negative recovery force and a negative levitation force. Vertically stacked double bubbles notably can be stable under levitation if their total vertical length is similar to 5 lambda/6, significantly beyond lambda/2 in consequence of the formation of a toroidal high-pressure region around the waist of the two bubbles. Our results provide a deeper insight into the stability of acoustic levitation and the coupling between bubbles and sound field. Published by AIP Publishing.
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