Cavitation Bubble Streaming in Ultrasonic-Standing-Wave Field
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概要
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The mechanism of cavitation bubble streaming by ultrasonic vibration in a water tank was experimentally investigated. A standard ultrasonic cleaner unit with a resonant frequency of 40 kHz was used as an ultrasonic generator. The behavior of the streaming was visualized by the schlieren method and sonochemical luminescence, and the velocity of the streaming was measured by laser Doppler velocity measurement equipment (LDV). The cavitation bubble streaming has two structures. A cavitation cloud, which consists of many cavitation bubbles, is shaped like a facing pair of bowls with a diameter of approximately 1/3 the wavelength of the standing wave, and moves inside the standing-wave field with a velocity of 30 to 60 mm/s. The cavitation bubbles move intensely in the cloud with a velocity of 5 m/s at an ultrasonic output power of 75 W. The streaming is completely different from conventional acoustic streaming. Also the cavitation bubble is generated neither at the pressure node nor at the antinode.
- 2005-05-15
著者
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Kuroiwa Masaya
Honda R&d Co. Ltd. Tochigi R&d Center
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Okada Yasuyuki
Department Of Applied Chemistry School Of Science And Engineering; Kagami Memorial Laboratory For Ma
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Murakami Koichi
Department Of Mechanical Engineering Ehime University
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Mukasa Shinobu
Department of Engineering for Production and Environment, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan
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Nomura Shinfuku
Department of Engineering for Production and Environment, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan
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Okada Yasuyuki
Department of Mechanical Engineering, Faculty of Engineering, Ehime University, 3 Bunkyou-cho, Matsuyama 790-8577, Japan
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Murakami Koichi
Department of Mechanical Engineering, Faculty of Engineering, Ehime University, 3 Bunkyou-cho, Matsuyama 790-8577, Japan
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Murakami Koichi
Department Mechanical Engineering, Faculty of Engineering, Ehime University
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Mukasa Shinobu
Department of Mechanical Engineering, Faculty of Engineering, Ehime University, 3 Bunkyou-cho, Matsuyama 790-8577, Japan
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