Theoretical and experimental examination of near-field acoustic levitation |
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Authors: | Nomura Hideyuki Kamakura Tomoo Matsuda Kazuhisa |
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Institution: | The University of Electro-Communications, Chofugaoka, Chofu-shi, Japan. nomu@t.kanazawa-u.ac.jp |
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Abstract: | A planar object can be levitated stably close to a piston sound source by making use of acoustic radiation pressure. This phenomenon is called near-field acoustic levitation Y. Hashimoto et al., J. Acoust. Soc. Am. 100, 2057-2061 (1996)]. In the present article, the levitation distance is predicted theoretically by numerically solving basic equations in a compressible viscous fluid subject to the appropriate initial and boundary conditions. Additionally, experiments are carried out using a 19.5-kHz piston source with a 40-mm aperture and various aluminum disks of different sizes. The measured levitation distance agrees well with the theory, which is different from a conventional theory, and the levitation distance is not inversely proportional to the square root of the surface density of the levitated disk in a strict sense. |
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