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<p>The interaction between ultrasound and the air-liquid interface is widely involved in sonar communication, medical imaging, acoustic detection, etc. In this work, we report an intriguing bubbling phenomenon occurring at the liquid surface exposed to acoustic radiation. The phenomenon can be robustly triggered once the distance between the liquid surface and the acoustic probe is adjusted to multiples of half sound wavelength. It is clarified that the bubbling is attributed to the Helmholtz resonance of the liquid concavity caused by the acoustic radiation force. The sizes of the final obtained bubbles show a universal scaling law with acoustic Bond number and acoustic Reynolds number: <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11433_2025_2653_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="143" /> </InlineMediaObject> <EquationSource Format="TEX">\(R\approx \lambda \cdot Bo_{a} \cdot {\sqrt {Re_{a}}}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mi>R</mi> <mo>≈</mo> <mi>λ</mi> <mo>⋅</mo> <mi>B</mi> <msub> <mi>o</mi> <mrow> <mi>a</mi> </mrow> </msub> <mo>⋅</mo> <mrow> <msqrt> <mi>R</mi> <msub> <mi>e</mi> <mrow> <mi>a</mi> </mrow> </msub> </msqrt> </mrow> </math></EquationSource> </InlineEquation>, which is independent of the types of liquids. Moreover, it was found that the bubbling phenomenon showed a significantly enhanced particle absorption ability, thus shedding light on the development of solid filter-free air purification techniques.</p>

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Scaling law of ultrasonic-induced bubbling toward solid-free air purification

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Xiuxing Tang,
  • Hongyue Chen,
  • Xiaoliang Ji,
  • Liang Zhang,
  • Marco A. B. Andrade,
  • Muyang Zhang,
  • Jieming Zhang,
  • Minghao Zhou,
  • Yichen Jiang,
  • Duyang Zang

摘要

The interaction between ultrasound and the air-liquid interface is widely involved in sonar communication, medical imaging, acoustic detection, etc. In this work, we report an intriguing bubbling phenomenon occurring at the liquid surface exposed to acoustic radiation. The phenomenon can be robustly triggered once the distance between the liquid surface and the acoustic probe is adjusted to multiples of half sound wavelength. It is clarified that the bubbling is attributed to the Helmholtz resonance of the liquid concavity caused by the acoustic radiation force. The sizes of the final obtained bubbles show a universal scaling law with acoustic Bond number and acoustic Reynolds number: \(R\approx \lambda \cdot Bo_{a} \cdot {\sqrt {Re_{a}}}\) R ≈ λ ⋅ B o a ⋅ R e a , which is independent of the types of liquids. Moreover, it was found that the bubbling phenomenon showed a significantly enhanced particle absorption ability, thus shedding light on the development of solid filter-free air purification techniques.