An improved water-filled impedance tube

Wilson, Preston S.; Roy, Ronald A.; Carey, William M.

doi:10.1121/1.1572140

Cited by 39 publications

(37 citation statements)

References 13 publications

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“…This demonstration is intended for a younger science or lay audience, and so the explanations are qualitative (although more detailed explanations are available in the literature, for acoustic absorption, [12][13][14][15] propagation in pipes, 16,17 and losses due to bubbles, 5 water droplets, 18 and other particles in suspension [19][20][21]. Test audiences aging from 10 years old to mature lay members of the public have appreciated the following explanations.…”

Section: Discussionmentioning

confidence: 99%

Demonstration comparing sound wave attenuation inside pipes containing bubbly water and water droplet fog

Leighton

Jiang

Baik

2012

The Journal of the Acoustical Society of America

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This paper describes a demonstration and explanation of sound absorption in water due to bubbles, and in air due to a fog of water droplets. It is suitable for 10-12 year olds, but the paper indicates where further exploration of the simplifications in the explanations provided for that age range would allow the demonstration to be used for undergraduate and Masters-level teaching. Applications to submarines, the space shuttle, and neutron generators are described. The demonstration is designed for transportation in a family-sized car.

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Section: Discussionmentioning

confidence: 99%

Demonstration comparing sound wave attenuation inside pipes containing bubbly water and water droplet fog

Leighton

Jiang

Baik

2012

The Journal of the Acoustical Society of America

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“…An interesting question is the following: why are correlations important in the bubbly medium studied here, whereas they have not been detected before for bubbles in water [26] or bubbles in a yield stress fluid [8]? According to equation (17), the magnitude of the correction due to the positional correlations is proportional to the volume fraction of scatterers Φ, which was generally lower in previous studies (5 × 10 −4 to 10 −2 at most), so that β would be expected to be low.…”

Section: Discussionmentioning

confidence: 99%

Influence of positional correlations on the propagation of waves in a complex medium with polydisperse resonant scatterers

et al. 2011

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We present experimental results on a model system for studying wave propagation in a complex medium exhibiting low frequency resonances. These experiments enable us to investigate a fundamental question that is relevant for many materials, such as metamaterials, where low-frequency scattering resonances strongly influence the effective medium properties. This question concerns the effect of correlations in the positions of the scatterers on the coupling between their resonances, and hence on wave transport through the medium. To examine this question experimentally, we measure the effective medium wave number of acoustic waves in a sample made of bubbles embedded in an elastic matrix over a frequency range that includes the resonance frequency of the bubbles. The effective medium is highly dispersive, showing peaks in the attenuation and the phase velocity as functions of the frequency, which cannot be accurately described using the Independent Scattering Approximation (ISA). This discrepancy may be explained by the effects of the positional correlations of the scatterers, which we show to be dependent on the size of the scatterers. We propose a self-consistent approach for taking this "polydisperse correlation" into account and show that our model better describes the experimental results than the ISA.

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“…It is described in Ref. 17 and has a circular-shaped radiating face with an accelerometer imbedded in it, and therefore can be driven at constant velocity amplitude by suitable monitoring of the accelerometer signal and modification of the excitation voltage amplitude. The source was placed face-down on the surface of the sediment in one of two positions, to be described later.…”

Section: Low-frequency Resonance Measurementsmentioning

confidence: 99%

Evidence of dispersion in an artificial water-saturated sand sediment

Wilson

Reed

Wilbur

et al. 2007

The Journal of the Acoustical Society of America

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A laboratory experiment was conducted to measure the speed of sound in an artificial water-saturated granular sediment composed of cleaned and sorted medium-grained sand and degassed distilled water. The experiment was conducted within a range of frequencies where dispersion is predicted by a number of existing models. Between 2 and 4 kHz, the sound speed was inferred from measurements of the resonance frequencies of a thin-walled cylindrical container filled with the material. An elastic waveguide model was used to account for the effect of the finite impedance of the walls, although this effect was found to be small. From 20 to 300 kHz, the sound speed was obtained directly from time-of-flight measurements within the sediment. Dispersion in close agreement with the Williams effective density fluid model [K. L. Williams, J. Acoust. Soc. Am. 110, 2276-2281 (2001)] was observed.

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An improved water-filled impedance tube

Cited by 39 publications

References 13 publications

Demonstration comparing sound wave attenuation inside pipes containing bubbly water and water droplet fog

Demonstration comparing sound wave attenuation inside pipes containing bubbly water and water droplet fog

Influence of positional correlations on the propagation of waves in a complex medium with polydisperse resonant scatterers

Evidence of dispersion in an artificial water-saturated sand sediment

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