Air injector geometry affects passive bubble acoustic signatures

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2024-07-09 DOI:10.1016/j.expthermflusci.2024.111265

A. Vazquez , R.M. Del Castillo , R. Manasseh , B. Roche

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Abstract

Understanding the passive acoustic signals of gas bubbles has become increasingly imporant due to their growing relevance in ambient marine acoustics and medical areas, as well as the recent search for dark matter by Bubble Chamber Detectors. Here the acoustic signatures of 2.24, 1.83, 1.75, 1.66 and 1.43 mm radii bubbles are reported experimentaly. They were generated by two different air injectors in a quiescent liquid, a standard plastic syringe tube and 97 degrees-rotated metallic needles. The evolution of the sound pulse over time is presented alongside simultaneous images of the bubbles detaching from the injector and moving freely in the liquid. The beat-wave phenomenon is the standard interference pattern between two sounds of slightly different frequencies, generating a beat-period envelope of “rosary chain” form. In this study, beats are observed when the bubble exhibits changes in its shape through Cassini-oval, trapezoid, ‘guitar pick’, ellipsoid and oblate shapes, which is in agreement with earlier results on bubble fragmentation in a locally sheared flow. Finally, theoretical curve fits of freely-oscillating, lightly-damped bubble sound emissions confirm that the beats are due to changes in the bubble shapes.

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空气喷射器的几何形状会影响被动气泡声学特征

了解气泡的被动声学信号变得越来越重要，这是因为气泡在环境海洋声学和医学领域的相关性越来越大，而且最近气泡腔探测器也在寻找暗物质。这里报告的是 2.24、1.83、1.75、1.66 和 1.43 毫米半径气泡的声学特征。它们是由静态液体中的两种不同空气注入器、标准塑料注射管和旋转 97 度的金属针头产生的。声脉冲随时间的演变与气泡脱离喷射器并在液体中自由移动的同步图像同时呈现。节拍波现象是频率略有不同的两种声音之间的标准干涉模式，产生 "念珠链 "形式的节拍周期包络。在这项研究中，当气泡的形状发生变化时，就会出现节拍，包括卡西尼椭圆形、梯形、"吉他拨片 "形、椭圆形和扁球形，这与早先关于局部剪切流中气泡破碎的研究结果一致。最后，对自由振荡的轻阻尼气泡声发射进行的理论曲线拟合证实，节拍是由气泡形状的变化引起的。

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.