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首页> 外文期刊>Journal of Applied Physics >Acoustic levitator for contactless motion and merging of large droplets in air
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Acoustic levitator for contactless motion and merging of large droplets in air

机译：声学悬浮器，用于非接触运动和空气中大液滴的合并

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摘要

Large droplet transport in a line-focussed acoustic manipulator in terms of maximum droplet size is achieved by employing a driving voltage control mechanism. The maximum volume of the transported droplets in the order of few microliters is thereby increased by three orders of magnitude compared to the constant voltage case, widening the application field of this method significantly. A drop-on-demand droplet generator is used to supply the liquid droplets into the system. The ejected sequence of picoliter-size droplets is guided along trajectories by the acoustic field and accumulates at the selected pressure node, merging into a single large droplet. Droplet movement is achieved by varying the reflector height. This also changes the intensity of the radiation pressure during droplet movement, which in turn could atomise the droplet. The acoustic force is adjusted by regulating the driving voltage of the actuator to keep the liquid droplet suspended in air and to prevent atomisation. In the herein presented levitation concept, liquids with a wide range of surface tension (water and tetradecane were tested) can be transported over distances of several mm. The aspect ratio of the droplet in the acoustic field is shown to be a good indicator for radiation pressure intensity and is kept between 1.1 and 1.4 during droplet transport. Despite certain limitations with volatile liquids, the presented acoustic levitator concept has the potential to expand the range of analytical characterisation and manipulation methods in applications ranging from chemistry and biology.
机译：通过采用驱动电压控制机制，可以在最大聚焦液滴尺寸的集中线声操纵器中实现大液滴的输送。因此，与恒定电压的情况相比，输送的液滴的最大体积约为几微升，增加了三个数量级，从而大大拓宽了该方法的应用领域。按需滴液滴发生器用于将液滴供应到系统中。皮克大小的液滴的喷射序列被声场沿着轨迹引导，并在选定的压力节点处累积，合并为单个大液滴。液滴的移动是通过改变反射器的高度来实现的。这也改变了液滴运动过程中辐射压力的强度，这又可能使液滴雾化。通过调节致动器的驱动电压来调节声力，以保持液滴悬浮在空气中并防止雾化。在本文提出的悬浮概念中，具有广泛表面张力的液体（已测试了水和十四烷）可以在几毫米的距离内传输。液滴在声场中的长宽比显示出是辐射压力强度的良好指标，在液滴运输过程中保持在1.1和1.4之间。尽管挥发性液体有一定的局限性，但所提出的声波悬浮器概念仍有可能在化学和生物学等应用中扩展分析表征和操纵方法的范围。

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  • 来源
    《Journal of Applied Physics》 |2012年第5期|p.053510.1-053510.7|共7页
  • 作者

    Bjelobrk Nada; Nabavi Majid; Poulikakos Dimos;

  • 作者单位

    Department of Mechanical and Process Engineering, Laboratory of Thermodynamics in Emerging Technologies, Institute of Energy Technology, ETH Zurich, CH-8092 Zurich, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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