Ballistic Sound Wave in Rarefied Argon Gas
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概要
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The velocity of argon gas molecules was modulated by a vibrating plate with a frequency of 40 kHz under a pressure of 0.1 Pa, and the velocity modulation of the gas molecules was detected through pressure variation on the diaphragm of a microphone in the same way as the signal of a sound wave. The measurement shows that the apparent local phase velocity increases with the propagation distance, indicating the phase mixing of the velocity modulation of free-streaming gas molecules or the ballistic sound wave. Such phase mixing is expected since the mean free path of inter-molecular collisions is about ten times longer than the wavelength of a sound wave with the same frequency.
- 社団法人日本物理学会の論文
- 2002-08-15
著者
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Tsushima Akira
Faculty Of Engineering Yokohama National University
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TANAKA Takeshi
Faculty of Engineering, Yokohama National University
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Tanaka Takeshi
Faculty Of Engineering Ritsumeikan University
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Tanaka Takeshi
Faculty Of Engineering Yokohama National University:(present Address)advantest Co.
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