Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
Ultrason Sonochem. 2013 Jan;20(1):565-70. doi: 10.1016/j.ultsonch.2012.07.026. Epub 2012 Aug 20.
Different modes of cavitation zones in an immersion-type sonochemical reactor have been realized based on the concept of acoustic resonance fields. The reactor contains three main components, namely a Langevin-type piezoelectric transducer (20 kHz), a metal horn, and a circular cylindrical sonicated cell filled with tap water. In order to diminish the generation of cavitation bubbles near the horn-tip, an enlarged cone-shaped horn is designed to reduce the ultrasonic intensity at the irradiating surface and to get better distribution of energy in the sonicated cell. It is demonstrated both numerically and experimentally that the cell geometry and the horn position have prominent effects on the pressure distribution of the ultrasound in the cell. With appropriate choices of these parameters, the whole reactor works at a resonant state. Several acoustic resonance modes observed in the simulation are realized experimentally to generate a large volume of cavitation zones using a very low ultrasonic power.
基于声共振场的概念，在浸入式声化学反应器中实现了不同模式的空化区。该反应器包含三个主要组件，即兰格文型压电换能器（20 kHz）、金属号角和充满自来水的圆柱形声处理单元。为了减少在号角尖端附近产生的空化气泡，设计了一个放大的锥形号角，以降低辐照表面的超声强度，并使声处理单元中的能量分布更好。数值和实验都证明了单元几何形状和号角位置对单元中超声波压力分布有显著影响。通过适当选择这些参数，整个反应器在共振状态下工作。在实验中实现了模拟中观察到的几种声共振模式，以使用非常低的超声功率产生大量的空化区。
