A non-contact ultrasonic atomization based on the Fabry–Pérot resonator is proposed to obtain atomized droplets with a reduced droplet diameter and concentrated droplet distributions. To better understand the mechanism inside the acoustic chamber, the acoustic–fluid interactions are numerically explored inside the Fabry–Pérot resonator to achieve the precise modulation of droplets. The influence of the acoustic chamber's geometry and the ultrasonic properties on the atomized droplet diameter and distributions is investigated, aiming to establish matching relationships between the atomized droplet diameter and the geometry of the acoustic chamber. The dynamic behaviors of droplet breakup are observed with a high-speed camera to reveal the atomization mechanism of liquid droplets in high-intensity acoustic fields. The experiments demonstrate that the proposed non-contact atomization can achieve atomized water droplets with a median diameter of ∼24 μm, providing an alternative to ultrasonic spray.

中文翻译：

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基于法布里-珀罗谐振器的声学调制和非接触式液滴雾化

提出了一种基于法布里-珀罗谐振器的非接触式超声雾化，以获得具有减小的液滴直径和集中的液滴分布的雾化液滴。为了更好地理解声室内部的机制，在法布里-珀罗谐振器内部对声-液相互作用进行了数值探索，以实现液滴的精确调制。研究了声室几何形状和超声特性对雾化液滴直径和分布的影响，旨在建立雾化液滴直径与声室几何形状之间的匹配关系。利用高速相机观察液滴破碎的动态行为，揭示高强度声场中液滴的雾化机制。实验表明，所提出的非接触雾化可以实现中值直径约 24 μm 的雾化水滴，为超声波喷雾提供了替代方案。