We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab ...We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab initio pressure field in the arrested liquid column. The generated pressure wave is shown by combining the theoretical analysis with the experimental observation to be a slightly varied version of water hammer. With relatively clean liquid, the magnitude of the tension peak generating the TSB is likely to reach of several millions Pa. It is also shown that the so generated cavitation bubble originating from the gas-containing bulk liquid is in ‘violent’ motion.展开更多
We have numerically analysed the stability of sonoluminescing bubbles in a relatively wide range of experimental parameters and have determined the stable domains for single-bubble sonoluminescence in the Pa - Ro phas...We have numerically analysed the stability of sonoluminescing bubbles in a relatively wide range of experimental parameters and have determined the stable domains for single-bubble sonoluminescence in the Pa - Ro phase diagrams. We map the phase diagrams when the frequency of the driving pressure f is 26.5 kHz at the ambient pressure Po of 2 and 0.5atm, and for the frequencies 10 and 1 kHz at 1 atm. When the frequency is lowered to 1 kHz, the ambient radius Ro can be as large as 20μm.展开更多
基金supported by the National Natural Science Foundation of China (Grant No 10434070)
文摘We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab initio pressure field in the arrested liquid column. The generated pressure wave is shown by combining the theoretical analysis with the experimental observation to be a slightly varied version of water hammer. With relatively clean liquid, the magnitude of the tension peak generating the TSB is likely to reach of several millions Pa. It is also shown that the so generated cavitation bubble originating from the gas-containing bulk liquid is in ‘violent’ motion.
基金Supported by the National Natural Science Foundation of China under Grant No.19934001。
文摘We have numerically analysed the stability of sonoluminescing bubbles in a relatively wide range of experimental parameters and have determined the stable domains for single-bubble sonoluminescence in the Pa - Ro phase diagrams. We map the phase diagrams when the frequency of the driving pressure f is 26.5 kHz at the ambient pressure Po of 2 and 0.5atm, and for the frequencies 10 and 1 kHz at 1 atm. When the frequency is lowered to 1 kHz, the ambient radius Ro can be as large as 20μm.
