Acoustic characterisation of liquid foams with an impedance tube
Acoustic characterisation of liquid foams with an impedance tube
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DOI：
10.1140/epje/i2013-13113-1
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发表时间：
2013-10-15
影响因子：
1.8
通讯作者：
Leroy, Valentin
中科院分区：
文献类型：
--
作者：
Pierre, Juliette;Guillermic, Reine-Marie;Leroy, Valentin
声学测量为材料的表征提供了方便的非侵入性手段。我们在这里展示的第一次如何商业阻抗管可以用来提供准确的测量的速度和衰减的声波在液体泡沫，以及其有效的“声”密度，在0.5-6 kHz的频率范围。我们使用两种类型的液体泡沫来证明这一点：商业剃须泡沫和“自制”泡沫，具有良好的控制物理化学和结构特性。在后者泡沫中的声速被发现是独立的气泡尺寸分布，是非常好的描述伍德定律。这意味着，阻抗技术可能是一种方便的方法来测量在现场的液体泡沫的密度。重要的问题仍然是关于声衰减，这被发现是在一个目前无法预测的方式影响的物理化学组成和气泡尺寸分布的特征泡沫。我们确认在两种类型的泡沫（具有相同的结构特性），这表明液体泡沫的物理化学组成的声速的差异有一个不可忽视的影响，他们的声学性能。
Acoustic measurements provide convenient non-invasive means for the characterisation of materials. We show here for the first time how a commercial impedance tube can be used to provide accurate measurements of the velocity and attenuation of acoustic waves in liquid foams, as well as their effective "acoustic" density, over the 0.5-6 kHz frequency range. We demonstrate this using two types of liquid foams: a commercial shaving foam and "home-made" foams with well-controlled physico-chemical and structural properties. The sound velocity in the latter foams is found to be independent of the bubble size distribution and is very well described by Wood's law. This implies that the impedance technique may be a convenient way to measure in situ the density of liquid foams. Important questions remain concerning the acoustic attenuation, which is found to be influenced in a currently unpredictible manner by the physicochemical composition and the bubble size distribution of the characterised foams. We confirm differences in sound velocities in the two types of foams (having the same structural properties) which suggests that the physico-chemical composition of liquid foams has a non-negligible effect on their acoustic properties.