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Sonoluminescence and acoustic cavitation

机译:声致发光和声空化

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摘要

Sonoluminescence (SL) is light emission under high-temperature and high-pressure conditions of a cavitating bubble under intense ultrasound in liquid. In this review, the fundamentals of the interactions between the sound field and the bubble, and between bubbles are explained. Experimental results on high-speed shadowgraphy of bubble dynamics and multibubble SL are shown, demonstrating that the SL intensity is closely related to the bubble dynamics. SL studies of alkali-metal atom (Na and K) emission are summarized. The spectral measurements in solutions with different noble-gas dissolutions and in surfactant solutions, and the results of spatiotemporal separation of SL distribution strongly suggested that the site of alkali-metal atom emission is the gas phase inside bubbles. The spectral studies indicated that alkali-metal atom lines are composed of two kinds of lines: a component that is broadened and shifted from the original D lines arises from van der Waals molecules formed between alkali-metal atoms and noble-gas atoms under extreme conditions at bubble collapse. The other spectral component exhibiting no broadening and no shift was suggested to originate from higher temperature bubbles than those producing the broadened component. (C) 2017 The Japan Society of Applied Physics
机译:声致发光(SL)是在液体中强烈超声作用下,空化气泡在高温高压条件下发出的光。在这篇综述中,解释了声场与气泡之间以及气泡之间相互作用的基本原理。显示了气泡动力学和多气泡SL的高速阴影摄影的实验结果,表明SL强度与气泡动力学密切相关。总结了对碱金属原子(Na和K)发射的SL研究。在具有不同惰性气体溶解度的溶液和表面活性剂溶液中的光谱测量以及SL分布的时空分离结果强烈表明,碱金属原子发射的位置是气泡内部的气相。光谱研究表明,碱金属原子谱线由两种谱线组成:在原始条件下,原始D谱线发生扩宽和位移的成分是在极端条件下,碱金属原子与稀有气体原子之间形成的范德华分子形成的。在泡沫破裂时。与产生增宽分量的那些相比,没有表现出增宽且没有位移的其他光谱分量被认为是由更高温度的气泡引起的。 (C)2017日本应用物理学会

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  • 来源
    《Japanese journal of applied physics》 |2017年第7s1期|07JA01.1-07JA01.9|共9页
  • 作者

    Choi Pak-Kon;

  • 作者单位

    Meiji Univ, Dept Phys, Kawasaki, Kanagawa 2148571, Japan;

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  • 正文语种 eng
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