Acoustic analysis of jet atomization for uniform dispersion of nano- and micro-droplets
Acoustic analysis of jet atomization for uniform dispersion of nano- and micro-droplets
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DOI：
10.1063/5.0125547
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发表时间：
2022-12
影响因子：
3.2
通讯作者：
H. Matsuura;H. Furukawa;Atsushi Kondo;T. Tanikawa;Hideki Hashimoto
中科院分区：
文献类型：
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作者：
H. Matsuura;H. Furukawa;Atsushi Kondo;T. Tanikawa;Hideki Hashimoto
在这项研究中，基于对可听范围内(∼20 kHz)雾化声音的频率分析，分析了喷射雾化的机理。喷射雾化是一种使用隔膜的二维高速雾化，在疏水和亲水隔膜上检测到了有趣的声信号和雾化现象。亲水性隔膜与表面波发生强烈的相互作用和共振，形成相对于隔膜对称的喷射雾化。通过计算膜片的本征频率和由朗氏方程计算的液滴直径的重合，支持了膜片和表面波之间的共振。值得注意的是，由超声波换能器激励的隔膜充当了垂直于换能器振动的新换能器。结果表明，当膜片与表面波在2.4 MHz频率下发生共振时，在垂直于换能器振动方向的方向上产生了对称的二维高速射流雾化。这项研究还表明，可以根据声学分析来确定雾化状态。这种雾化声音的声学分析可以应用于更先进的雾化控制，例如提供含有DNA、药物或微塑料的液滴的均匀分散。
In this study, the mechanisms of jet atomization were analyzed based on a frequency analysis of atomization sounds in the audible range (∼20 kHz). Jet atomization is a two-dimensional, high-speed atomization using a diaphragm, and interesting acoustic signals and atomization phenomena were detected on hydrophobic and hydrophilic diaphragms. The hydrophilic diaphragm strongly interacted and resonated with the surface wave, resulting in symmetrical jet atomization relative to the diaphragm. The resonance between the diaphragm and the surface wave was supported by a calculation of the eigenfrequency of the diaphragm and the coincidence of the droplet diameters as calculated from Lang's equation. Notably, the diaphragm excited by the ultrasonic transducer acted as a new transducer vibrating perpendicular to the transducer. As a result, when the diaphragm and the surface wave were in resonance at 2.4 MHz, a symmetrical two-dimensional high-speed jet atomization was generated in the direction perpendicular to the transducer’s vibration direction. This study also revealed that the atomization state can be determined based on the acoustic analysis. This acoustic analysis of atomization sounds can be applied in more advanced atomization control, such as for providing uniform dispersions of droplets containing DNA, drugs, or microplastics.