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首页> 外文期刊>PHYSICAL REVIEW E >Energy concentration and positional stability of sonoluminescent bubbles in sulfuric acid for different static pressures
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Energy concentration and positional stability of sonoluminescent bubbles in sulfuric acid for different static pressures

机译：不同静压力下硫酸中声致发光气泡的能量浓度和位置稳定性

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摘要

In this study we report several experimental and numerical results on the influence of static pressure (P0) overnthe main parameters in single bubble sonoluminescence (SBSL), using a sulfuric acid aqueous solution (SA)nwith low concentrations of argon gas dissolved. Bifrequency driving was used in the experiments to enhancenspatial stability of the bubbles. The experimental results were compared with simulations provided by a numericalncode that models the radial dynamics of the bubbles. The results showed that an increase on the static pressurenof the system shifts the Bjerknes instability threshold, allowing the bubble to access higher acoustic pressuresn(PAc). Furthermore, a decrease in the measured ambient radius R0 and the calculated relative gas concentrationnc∞/c0 were observed. A notorious increment in the bubble collapse violence and energy focusing for P0 aboven1 bar was achieved. These were mainly indicated by the growth of the bubble expansion ratio (Rmax/R0), thenbubblemechanical energy density, and the maximum bubble wall velocity dR/dt . In agreement with the previousnstatement, the maximum temperature during the bubble collapse predicted by the model is augmented as well.nThe use of different harmonics in the ultrasound pressure field regarding energy focusing is also discussed.nFinally, we analyzed the stability regions of the R0-PAc parameter space via numerical predictions for P0 aboventhe measured, identifying the shape instabilities as the main limiting agent to obtain further energy concentrationnin SA systems at high static pressures.
机译：在这项研究中，我们报告了使用低浓度氩气溶解的硫酸水溶液（SA）对单泡声致发光（SBSL）中静态压力（P0）对主要参数的影响的一些实验和数值结果。实验中使用双频驱动来增强气泡的空间稳定性。将实验结果与由数值代码提供的模拟结果进行了比较，该数值模型模拟了气泡的径向动力学。结果表明，系统静压力n的增加会改变Bjerknes不稳定性阈值，从而使气泡能够获得更高的声压n（PAc）。此外，观察到所测量的环境半径R 0和所计算的相对气体浓度nc∞/ c 0减小。 P0高于1 bar时，气泡破裂暴力和能量聚焦现象臭名昭著。这些主要由气泡膨胀率（Rmax / R0）的增长，气泡机械能密度和最大气泡壁速度dR / dt表示。与先前的陈述一致，该模型预测的气泡破裂过程中的最高温度也增加了。n还讨论了超声压力场中关于能量聚焦的不同谐波的使用。最后，我们分析了R0-的稳定区域。通过对所测得的P0的数值预测，PAc参数空间得以确定，确定形状不稳定性为主要限制因素，以便在高静压下在SA系统中获得更多的能量集中。

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  • 来源
    《PHYSICAL REVIEW E》 |2013年第3期|1-9|共9页
  • 作者

    Juan Manuel Rossell´o; Dami´an Dellavale; Fabi´an Jos´e Bonetto;

  • 作者单位

    Instituto Balseiro-CONICET Centro At´omico Bariloche R´ıo Negro R8402AGP Argentina;

    Instituto Balseiro-CONICET Centro At´omico Bariloche R´ıo Negro R8402AGP Argentina;

    Instituto Balseiro-CONICET Centro At´omico Bariloche R´ıo Negro R8402AGP Argentina;

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