121 ENERGY DECAY AND AMPLITUDE ATTENUATION BY MICRO-BUBBLES IN ULTRASONIC WAVE PROPAGATION(O.S.1 Usage of Sound Energy)
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概要
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The energy of ultrasonic vibration is greatly attenuated by the generation and movement of acoustic cavitation bubbles induced by the effect of acoustic nonlinearity ultrasonic vibration. The heat release by attenuation is expected in a wide variety of filed including the heat transfer enhancement and biomedical applications. This paper presents a theory for the mechanism of amplitude attenuation of ultrasonic wave propagation. Also, the relationship between the heat generation by micro bubbles in ultrasonic waves and the decays of amplitude are elucidated. The irreversible process such as heat conduction, diffusion and viscosity are depend on the wave frequency. The method on how to enlarge the heat generation from the micro-bubbles or how to diminish the decay of the propagating ultrasonic waves in a media containing the micro-bubbles is obtained.
- 2005-05-31
著者
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NAKAGAWA Masafumi
Department of Mechanical Engineering, Toyohashi University of Technology
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Nakagawa Masafumi
Department Of Mechanical Engineering Toyohashi University Of Technology
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NOMURA Sinfuku
Department of Mechanical Engineering, Ehime University
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Nomura Sinfuku
Department Of Mechanical Engineering Ehime University
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Nakagawa Masafumi
Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
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