Excitation of airwaves caused by bubble bursting in a cylindrical conduit: Experiments and a model

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  • Tsukasa Kobayashi
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Atsuko Namiki
    Department of Earth and Planetary Science University of Tokyo Tokyo Japan
  • Ikuro Sumita
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan

書誌事項

公開日
2010-10
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2009jb006828
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Strombolian eruptions are considered to be a consequence of the bursting of a large bubble. In order to understand the relation between the style of bubble bursting and the resulting airwave, we perform experiments of bubble bursting at the top of the surface of viscous liquid contained in an acrylic pipe which acts as an air column and observe it visually and acoustically. We find that when the liquid viscosity is less than 1 Pa s, the bubble vibrates before bursting. The major source of the airwave during the sequence of the bubble bursting is the bubble vibration. On the other hand, when the liquid viscosity is greater than 1 Pa s, the bubble does not vibrate. During bubble bursting, an aperture appears on the bubble film. The aperture growth first accelerates and later decelerates before finally stopping. The major source of the airwave is the aperture growth. We calculate a synthetic waveform of the airwave generated by the aperture growth which explains the experimentally observed airwave well. When the frequency of the airwave generated by the aperture growth matches the eigenfrequency of the air column, resonance occurs. Applying this model to the Strombolian eruption, the characteristic low frequency (<20 Hz) is explained if the velocity of the aperture growth is several meters per second. The model also explains the asymmetrical initial rise of the airwave observed in the Strombolian eruptions as a result of the accelerating growth of the aperture.</jats:p>

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