Abstract

Sonofluorescence Display in Reflecting a Jetting Ultrasonic Cavitation Field

H.Li (P.O.Box 903, Ji'an City, Jiangxi Province, Ji'an, China)

e-mail: lihm@public1.japtt.jx.cn

Taking advantage of the sonofluorescence nature of aqueous luminol-alkaline solution, sonofluorescence pictures of a jetting ultrasonic cavitation field with a frequency of 1.65MHz during reflection were taken with an ordinary optical camera. The pictures show that in addition to the traditional transmission features of ultrasound, the jetting ultrasonic cavitation field possesses a new feature, i.e., a concentrated cavitation effect on the reflecting surface. This phenomenon is believed to come from the discontinuous interface between the reflecting surface and the solution, which acts as a new source of cavitation nucleus in the ultrasound transmission medium. It is the presence of this new source, much more cavitation events and intensive cavitation effects such as the sonofluorescence intend to occur at the interface.

Section : 4