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《Journal of South China University of Technology(Natural Science Edition)》 2008-07
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Analysis of Resonant Frequency of Cavitation Bubbles in Supercritical Fluid CO_2

Yang Ri-fu1 Qiu Tai-qiu2 Guo Juan2(1.School of Physics,South China University of Technology,Guangzhou 510640,Guangdong,China;2.Research Institute of Light Industry and Chemical Engineering,South China University of Technology, Guangzhou 510640,Guangdong,China)  
In order to reveal the characteristics of resonant frequency of the cavitation bubbles in supercritical fluid CO2 radiated with ultrasonic,the laws of the resonant frequency varying with the original radius of the bubbles,the fluid pressure and the fluid temperature were investigated based on the Rayleigh-Plesset equation.The results indicate that the resonant frequency of cavitation bubbles in supercritical fluid CO2 decreases with the increase in the original radius,increases with the fluid temperature,and decreases with the increase in fluid pressure till to a minimum value at 18 MPa.It is also found that,at the same initial bubble radius,the cavitation bubbles in supercritical fluid CO2 is of higher resonant frequency than that in water,and that the acoustic pressure for the cavitation bubble collapse in a ultrasonic period reaches the lowest value when the ultrasonic frequency is close to the natural resonant frequency of cavitation bubbles.
【Fund】: 国家自然科学基金资助项目(10674048);; 广东省自然科学基金资助项目(06025714);; 广东省科技计划项目(2007B031402003)
【CateGory Index】: O427.4
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