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Ultrasound-enhanced mass transfer during the growth and dissolution of surface gas bubbles

机译：在表面气泡的生长和溶解期间超声波增强的传质

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摘要

Proper understanding and control of the mass transfer capability of acoustically-driven gas bubbles is crucial for the safety of biomedical applications and the efficiency of many electrochemical processes. Here, we quantify experimentally the effect of ultrasound on the rate of dissolution and growth of a gas bubble in contact with a solid surface, focusing on the dynamics of the bubble radius on the diffusive time scale. Significant degrees of super- or undersaturation of the surrounding carbonated water ensure that acoustic microstreaming stands as the predominant mechanism behind the mass-transfer enhancement across the bubble surface during resonance. Single-frequency acoustic driving can momentarily amplify the rate of mass transfer by as much as two orders of magnitude; the overall mass transfer enhancement increases monotonically with the acoustic pressure amplitude and eventually plateaus. Frequency sweeps continuously looped in time prove a superior method of intensification. Provided that the sweep period is not too short, the direction of sweep matters: up-sweeps generally favour dissolution over growth, whereas down-sweeps favour growth over dissolution. An optimal sweep period that maximises the growth or dissolution process is shown to exist.
机译：正确的理解和控制声学驱动气泡的传质能力对于生物医学应用的安全性和许多电化学方法的效率至关重要。在这里，我们通过实验量化超声对与固体表面接触的气泡溶出度和生长的影响，聚焦在扩散时间尺度上的气泡半径的动态。周围的碳酸水的显着程度或缺少的超饱和度确保声微晶在共振期间在气泡表面穿过气泡表面的质量转移增强背后的主要机理。单频声学驾驶可以暂时放大质量转移率多达两个数量级;整体传质增强随声压幅度和最终平稳地单调地增加。频率扫描连续循环及时循环，证明了一种优越的强化方法。如果扫描期不太短，扫描的方向：扫掠的方向一般有利于溶解对生长，而扫描扫描对溶解的增长。最大化生长或溶解过程的最佳扫描周期存在。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121069.1-121069.12|共12页
  • 作者

    Pablo Penas; Alvaro Moreno Soto; Detlef Lohse; Guillaume Lajoinie; Devaraj van der Meer;

  • 作者单位

    Physics of Fluids group Max-Planck Center Twente for Complex Fluid Dynamics Department of Science and Technology MESA+ Institute and J. M. Burgers Center for Fluid Dynamics University of Twente PO Box 217 AE Enschede 7500 the Netherlands;

    Department of Mechanical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA;

    Physics of Fluids group Max-Planck Center Twente for Complex Fluid Dynamics Department of Science and Technology MESA+ Institute and J. M. Burgers Center for Fluid Dynamics University of Twente PO Box 217 AE Enschede 7500 the Netherlands;

    Physics of Fluids group Max-Planck Center Twente for Complex Fluid Dynamics Department of Science and Technology MESA+ Institute and J. M. Burgers Center for Fluid Dynamics University of Twente PO Box 217 AE Enschede 7500 the Netherlands;

    Physics of Fluids group Max-Planck Center Twente for Complex Fluid Dynamics Department of Science and Technology MESA+ Institute and J. M. Burgers Center for Fluid Dynamics University of Twente PO Box 217 AE Enschede 7500 the Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas bubble; Ultrasound; Mass transfer; Diffusive growth; Dissolution; Acoustic microstreaming;

    机译：气泡;超声;传质;扩散增长;解散;声微晶;

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