Reflection of surface acoustic waves by localized wetting liquids

Newton, Michael I.; McHale, Glen; Banerjee, M. K.

doi:10.1063/1.120505

Cited by 6 publications

(4 citation statements)

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“…However, a systematic decrease in separation of the reflection peaks occurs as the contact width increases. 24 When a small stripe of oil is placed on a substrate, such as lithium niobate, its cross section approximates a spherical cap shape. The oil then spreads across the surface, but with the maximum height reducing to conserve mass.…”

Section: Resultsmentioning

confidence: 99%

“…21 The only surface wave studies of the dynamic wetting of surfaces have used Rayleigh surface acoustic waves ͑SAW's͒ and highly viscous liquids. [22][23][24] In this previous work, we provided preliminary reports of both the existence of resonant reflections of SAW's from the stripe of fluid and the behavior of the acoustic signal transmitted through the stripe along the solid-liquid interface. In this paper, we report the results of a systematic series of experiments on the attenuation of a 169 MHz SAW by a spreading stripe of viscous oil and we provide an approximate model capable of explaining the resonance structure of the acoustic transmission signal.…”

Section: Introductionmentioning

confidence: 98%

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Surface acoustic wave resonances in the spreading of viscous fluids

et al. 1999

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Reflection and attenuation of a Rayleigh surface acoustic wave from a small stripe of viscous fluid spreading across the acoustic path have been observed. As the stripe spreads across the acoustic path, with an accompanying decrease in stripe height to conserve volume, the reflected and attenuated acoustic signals show a distinct pattern of resonances. This paper reports experimental results for the spreading of highly viscous poly͑dimethyl͒siloxane oils ͑100 000 cS͒ in the propagation path of a 169 MHz Rayleigh wave operating in pulse mode and develops a model to explain the observed resonances of the transmission coefficient. Simultaneous optical observations enable the time evolution of the shape of the stripe to be converted into changes in geometric parameters ͑contact width, spherical radius, height, and contact angle͒. To model the acoustic attenuation, an approach treating the fluid as a viscoelastic fluid with a single relaxation time ͑Maxwell model͒ is developed. This approach is able to explain the structure of the observed transmitted signal. Resonances in the transmission coefficient occur cyclically and correspond to the stripe height matching n s /4, where n is odd and s is the shear wavelength in the fluid. ͓S0163-1829͑99͒08711-1͔

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Surface acoustic wave resonances in the spreading of viscous fluids

et al. 1999

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“…Likewise, a reduction in the roughness increases the reflection coefficient. Figure 7 shows the reflection coefficient obtained by applying equations (11), (12) and (13) to the data of Figure 8. The stiffer the contact the greater the reflection of the Rayleigh wave.…”

Section: Analytical Prediction Of Rayleigh Wave Response From An Intementioning

confidence: 99%

“…Work on reflected surface waves from a liquid loaded surface have been conducted by Newton et al [13] and McHale et al [14]. In their work, a strip of viscous fluid (Fig.1g) was introduced directly into the path of a travelling surface wave.…”

Section: Fig1 Sources Of Rayleigh Wave Reflectionmentioning

confidence: 99%

The use of reflected Rayleigh waves to study rough contact interfaces

Ooi

Dwyer-Joyce

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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Ultrasonic reflectometry is commonly used in the field of tribology. Bulk waves that travel through a component and are reflected from an interface can be used to measure parameters such as contact stress and lubricant film thickness. This paper presents the development of a novel ultrasonic technique using Rayleigh waves that propagate along the surface of a component. An analytical model is first proposed to explain the interaction of Rayleigh waves with a contact interface. When contact parameters change, so does the amplitude of the reflected Rayleigh wave. From the reflected waves, it is possible to simultaneously predict both normal and tangential interface stiffness. Experiments have been conducted to show how the reflected waves change as cyclic loading is applied and the roughness of the contact interface varied. Results have shown there is good agreement between experimental data and analytical predictions. Potential application of this study includes the remote monitoring of sealing components such as o-rings or radial lip seals.

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