水蒸气对声致发光单气泡稳定性的影响

Effects of vapour on the stability of single-bubble sonoluminescence

在考虑水蒸气凝结与水的蒸发过程的基础上 ,推导了球形气泡形状稳定性方程 .利用这个方程以及气泡运动时的气体扩散平衡条件 ,分别研究了环境水温 2 1 7℃时声驱动频率为 2 0 6kHz(溶于水中的氩气含量是其饱和度的14 % )、环境水温 0℃时声驱动频率为 31 9kHz(溶于水中的氮气分压为 2 0kPa ,其中含 1%氩气 ) ,以及环境水温 2 0℃时声驱动频率为 33 8kHz(溶于水中的氮气分压为 2 0kPa ,其中含 1%氩气 )可控制条件下气泡稳定性问题 .理论计算结果与前人的实验数据比较 ,发现考虑水蒸气以后比忽略水蒸气对单气泡稳定区域的确定相对有所改进 .

We have derived a dynamical equation of shape instability for a spherical bubble, where water vapor evaporation and condensation at a sonoluminescencing bubble wall are considered. Using the derived equation and the mass, diffusive equilibrium condition for the bubble vibration, we investigate the bubble instability on those controlled conditions of water temperature and corresponding acoustic frequency (for 14% of argon concentration dissolved in water with the frequency of 20.6kHz at 21.7degreesC, for a 20kPa 1% argon in nitrogen bubble with the frequency of 31.9kHz at 0degreesC and with the frequency of 33.8kHz at 20degreesC Comparing the calculated results with the published experimental data, we find that the determination of critical boundaries of the instability can be improved to some extent by considering the effect of vapor.