| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Dynamic Superposition and Levitation Capability of Two Confronting Ultrasonic Waves |
| Na Yan, Wen-Li Di, Zhen-Yu Hong, Wen-Jun Xie, Bing-Bo Wei** |
Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072
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| Cite this article: |
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Na Yan, Wen-Li Di, Zhen-Yu Hong et al 2019 Chin. Phys. Lett. 36 034303 |
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Abstract The superposition dynamics of two confronting ultrasonic waves and their levitation capability for centimeter-sized thin disks are investigated by numerical analyses and validated by experiments. The sound pressure simulation reveals that two opposite ultrasonic waves provide a more effective standing-wave field than a single ultrasonic wave when the diameter of disk-shaped object approaches the wavelength scale. The dynamic superposition of two confronting beams facilitates the acoustic levitation of the clay disk and aluminum disk with diameters of 0.97$\lambda $ and 0.90$\lambda $. The acoustic radiation forces exerting on these thin disks are measured experimentally, which exhibit a better levitation stability for the centimeter-sized thin disks. The equilibrium levitation positions of the two disks are located near the sound pressure node, and the maximum acoustic radiation pressure on their surfaces is less than one percent of the maximum sound pressure.
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Received: 29 December 2018
Published: 24 February 2019
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51871186 and 51771156. |
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