Fundamental Studies of Industrial Production Methods for Nanometer-sized Functional Aerosols

喷嘴是一种雾化技术。然而，液滴的平均尺寸被限制在大于单微米的区域，以保持生产水平的吞吐量。为了实现先进的雾化，我们必须在传统的高压高速气流撞击的基础上，发展一种物理的能量传递过程。为此，我们重点研究了一种喷嘴与压电换能器的超声振荡器相结合的系统，该系统可以对喷嘴顶部进行超声振动。本文报道了结合压电超声振荡器的喷嘴的设计、制造和雾化特性。因此，我们已经证实，使用压电超声振荡器，液滴尺寸分布变得更窄，平均直径（SMD）缩小了7%。

Spray nozzles are used as one of the atomization technologies. However the droplet mean sizes ax limited larger than single-micron region, in keeping production level throughput. For realizing advanced atomization, we have to develop a physical energy transfer process as well as the conventional high pressure and high speed gas flow impinging. For this reason, we focused on a system in which spray nozzles combined with ultrasonic oscillators of piezoelectric transducers, and the tops of the nozzles can be ultrasonic-vibrated. In this paper, we report design, fabrication, and atomization characteristics of the spray nozzles combined with the piezoelectric ultrasonic oscillators. Consequently, we have confirmed that droplet size distributions become narrower, and mean diameters (SMD) ax downsized 7%, using the piezoelectric ultrasonic oscillators.