Enhancement of ultrasonic cavitation yield by multi-frequency sonication.
The paper reports the enhanced effect of multi-frequency ultrasonic irradiation on cavitation yield. The cavitation yield is characterized by electrical conductivity determination, fluorescence intensity determination and iodine release method. Two-frequency (28 kHz/0.87 MHz) orthogonal continuous ultrasound, two-frequency (28 kHz/0.87 MHz) orthogonal pulse ultrasound and three-frequency (28 kHz/1.0 MHz/1.87 MHz) orthogonal continuous ultrasound have been used. It has been found that the combined irradiation of two or more frequencies of ultrasound can produce a significant increase in cavitation yield compared with single frequency irradiation. The possible mechanisms of the enhanced effect are briefly discussed.
Feng
Ruo
R
State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, PR China. fengruo@nju.edu.cn
Zhao
Yiyun
Y
Zhu
Changping
C
Mason
T J
TJ