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<p>In this study, we investigated the shape evolution and atomization of an acoustically levitated bubble upon increasing the distance <i>H</i> between the ultrasound emitter and reflector. Here, a levitated soap bubble evolves progressively from an ellipsoidal shape to a spherical shape, and then recovers to its initial ellipsoidal shape. Through systematic experiments and numerical simulation, we demonstrate how the changing sound field affects the levitation state of a bubble and its shape evolution. The re-growth of sound intensity flattens the levitated bubble and makes it return to the initial ellipsoidal shape. This paper also reports two atomization modes of levitated bubble: Rayleigh-Plateau instability caused by capillary wave growth and buckling instability caused by acoustic resonance. This study provides new insights into the interaction between sound field and bubble dynamics, thus contributing to making better utilization of the acoustically levitated bubble reactor.</p>

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Abnormal shape evolution and atomization of acoustically levitated bubbles

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Xianyu Nong,
  • Hongyue Chen,
  • Xiaoliang Ji,
  • Zherui Hou,
  • Xiuxing Tang,
  • Minghao Zhou,
  • Duyang Zang

摘要

In this study, we investigated the shape evolution and atomization of an acoustically levitated bubble upon increasing the distance H between the ultrasound emitter and reflector. Here, a levitated soap bubble evolves progressively from an ellipsoidal shape to a spherical shape, and then recovers to its initial ellipsoidal shape. Through systematic experiments and numerical simulation, we demonstrate how the changing sound field affects the levitation state of a bubble and its shape evolution. The re-growth of sound intensity flattens the levitated bubble and makes it return to the initial ellipsoidal shape. This paper also reports two atomization modes of levitated bubble: Rayleigh-Plateau instability caused by capillary wave growth and buckling instability caused by acoustic resonance. This study provides new insights into the interaction between sound field and bubble dynamics, thus contributing to making better utilization of the acoustically levitated bubble reactor.