Acoustic waveform of continuous bubbling in a non-Newtonian fluid.
Acoustic waveform of continuous bubbling in a non-Newtonian fluid.
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非牛顿流体中连续冒泡的声波波形。
DOI：
10.1103/physreve.80.066314
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
K. Kurita
中科院分区：
文献类型：
--
作者：
V. Vidal;M. Ichihara;M. Ripepe;K. Kurita
本文对非牛顿流体自由表面连续气泡破裂的声信号进行了实验研究。由于流体的流变特性，气泡形状是细长的，并且当在自由表面处破裂时，充当共振器。对于给定的流体浓度，在恒定的流速下，在表面处发生重复的气泡破裂。我们报告的调制模式的声波波形通过时间。此外，我们指出的存在的前兆声信号，记录在麦克风阵列上，之前的每一个突发。该前兆和突发信号之间的时间延迟与突发信号频率内容很好地相关。它们随时间的联合调制是由流体流变学驱动的，流体流变学强烈依赖于由于屈服应力而被困在流体中的小卫星气泡的存在。
We study experimentally the acoustic signal associated with a continuous bubble bursting at the free surface of a non-Newtonian fluid. Due to the fluid rheological properties, the bubble shape is elongated, and, when bursting at the free surface, acts as a resonator. For a given fluid concentration, at constant flow rate, repetitive bubble bursting occurs at the surface. We report a modulation pattern of the acoustic waveform through time. Moreover, we point out the existence of a precursor acoustic signal, recorded on the microphone array, previous to each bursting. The time delay between this precursor and the bursting signal is well correlated with the bursting signal frequency content. Their joint modulation through time is driven by the fluid rheology, which strongly depends on the presence of small satellite bubbles trapped in the fluid due to the yield stress.