非牛顿流体自由表面气泡破裂的声发射
Acoustic emission associated with the bursting of a gas bubble at the free surface of a non-newtonian fluid
摘要：
本文报道了在非牛顿流体自由表面气泡破裂时的声发射的实验测量结果。由于流体的粘弹性，气泡通常是细长的。讨论了相关的频率和持续时间的声信号的气泡的形状，并成功地占一个简单的线性模型。声能对薄膜破裂的动力学表现出高灵敏度，这表明，在实践中，几乎不可能从声学测量中推断出事件释放的能量总量。我们的实验研究结果提供了线索，无论是从火山或泡沫，其中一个观察到的信号的理解，在熔岩和泡沫破裂雪崩的自由表面的巨大气泡的破裂。
英文摘要：
We report experimental measurements of the acoustic emission associated with the bursting of a gas bubble at the free surface of a non-newtonian fluid. On account of the viscoelastic properties of the fluid, the bubble is generally elongated. The associated frequency and duration of the acoustic signal are discussed with regard to the shape of the bubble and successfully accounted for by a simple linear model. The acoustic energy exhibits a high sensitivity to the dynamics of the thin film bursting, which demonstrates that, in practice, it is barely possible to deduce from the acoustic measurements the total amount of energy released by the event. Our experimental findings provide clues for the understanding of the signals from either volcanoes or foams, where one observes respectively, the bursting of giant bubbles at the free surface of lava and bubble bursting avalanches.
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