Abstract: Ultrasound of frequencey 1.8 MHz,sound intensity 1～5 W•cm－2 were used to induce sonochemical reaction in near field acoustical sonochemical reactor.It was found that the sonochemical yield (expressed by the electro-conductance,the pH value,I2 releasing from KI solution and generation in cavitation water) have linear relation with sound intensity and irradiation time.These results were compared with the sonochemical yield in pulsed ultrasonic field.The cavitational bubble′s amount in cavitational sound field is also presented.

Key words: Ultrasound, Cavitation, Cavitation bubble, Sonochemical yield, Reaction dynamic equation