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Single bubble sonoluminescence driven by non-simple-harmonic ultrasounds
Weizhong Chen1, Xi Chen, Meijun Lu
1Institute of Acoustics, Nanjing University, China. wzchen@nju.edu.cn
The Journal of the Acoustical Society of America
|June 27, 2002
Summary
The waveform of driving ultrasound significantly impacts single bubble sonoluminescence (SBSL). Triangular waves are most effective for SBSL, while rectangular waves produce the brightest flashes at constant amplitude.
Area of Science:
- Acoustics
- Nonlinear acoustics
- Bubble dynamics
Background:
- Single bubble sonoluminescence (SBSL) is a phenomenon where light is emitted from a collapsing bubble in a liquid driven by ultrasound.
- The waveform of the driving ultrasound is known to influence SBSL characteristics, but a systematic comparison of different waveforms is needed.
Purpose of the Study:
- To investigate the dependence of single bubble sonoluminescence (SBSL) on various driving ultrasound waveforms.
- To compare the effectiveness and intensity of SBSL driven by rectangular, triangular, and pulsed sinusoidal waves.
Main Methods:
- Experimental investigation of SBSL using three distinct non-simple-harmonic waveforms: rectangular, triangular, and pulsed sinusoidal.
- Numerical simulations to model and analyze the observed SBSL phenomena under different driving conditions.
Main Results:
- The triangular wave was found to be the most effective waveform for driving SBSL.
- The rectangular wave, while less effective overall, produced the brightest SBSL flashes when sound pressure amplitude was constant.
- Pulsed sinusoidal waves resulted in stable, periodic SBSL flashes, with intensity increasing when the pulse was at an optimal phase.
Conclusions:
- Ultrasound waveform significantly influences SBSL effectiveness and intensity.
- Optimizing waveform shape and pulse timing can enhance SBSL output.
- Numerical simulations qualitatively agree with experimental findings, validating the models used.