Abstract
An ultrasonic reactor has been built to understand the augment of ultrasonic cavitation effect under dual frequency. Therephthalate dosimetry has been performed to determine the sonolytic yields of the OH free radicals which are produced in aqueous solution after ultrasonic irradiation. In this paper, two sets of dual-frequency ultrasound irradiation experiments composing of 20 kHz and 25 kHz, 20 kHz and 1.106 MHz, respectively, have been carried out. The studies indicated that dual-frequency ultrasonic irradiation can significantly enhance the cavitation effect, the acoustic cavitation yield were significantly greater compared to single frequency irradiation.