다단 혼 형태의 초음파 장비를 이용한 초음파 화학적 효과 연구

Abstract

Since the typical horn-type ultrasonic equipment induces a reaction at the probe tip, the sonochemical reaction has alimitation that it occurs only in a specific area. As one of the ways to overcome this limitation, an ultrasonic device withmulti-stepped horn equipped with several oscillators has been developed. The objective of this study was to investigate thesonochemical effects induced by acoustic cavitation system in 20 kHz multi-stepped ultrasonic horn using calorimetry, KIdosimetry and the luminol test. The sonochemical effects of multi-stepped ultrasonic horn were compared with that of thetypical horn-type 20 kHz ultrasonic device. The effect of immersion depth and power on the sonochemical reaction wasinvestigated in the ultrasonic system with multi-stepped ultrasonic horn. Higher calorimetric energy was obtained at higherimmersion depth and power conditions. Sonochemical effects increased significantly when using the high immersiondepth and input power. However, as the input power increased, the cavitation reaction zone concentrated around theultrasonic horn. Additionally, the experiments to examine the effect of liquid temperature was conducted. The smallersonochemical reaction was obtained for the higher liquid temperature. The effect on temperature seems to be closelyrelated to liquid conditions such as viscosity and vapor pressure of water.