The calming effect of oil on water

Behroozi, Peter; Cordray, Kimberly; Griffin, W. S.; Behroozi, F.

doi:10.1119/1.2710482

Cited by 29 publications

(24 citation statements)

References 15 publications

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“…Historically, techniques for measuring the interfacial rheology have relied on extracting the wavenumber and damping factor from the surface height field h of a travelling gravity-capillary wave (Miyano et al 1983;Jiang et al 1993;Saylor et al 2000;Behroozi et al 2007). The experiments described here provide a way to make a more direct measurement, using the Γ field in addition to the h field.…”

Section: Discussionmentioning

confidence: 97%

Spatiotemporal measurement of surfactant distribution on gravity–capillary waves

2015

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Materials adsorbed onto the surface of a fluid -for instance, crude oil, biogenic slicks or industrial/medical surfactants -will move in response to surface waves. Owing to the difficulty of non-invasive measurement of the spatial distribution of a molecular monolayer, little is known about the dynamics that couple the surface waves and the evolving density field. Here, we report measurements of the spatiotemporal dynamics of the density field of an insoluble surfactant driven by gravity-capillary waves in a shallow cylindrical container. Standing Faraday waves and travelling waves generated by the meniscus are superimposed to create a non-trivial surfactant density field. We measure both the height field of the surface using moiré imaging, and the density field of the surfactant via the fluorescence of NBD-tagged phosphatidylcholine, a lipid. Through phase averaging stroboscopically acquired images of the density field, we determine that the surfactant accumulates on the leading edge of the travelling meniscus waves and in the troughs of the standing Faraday waves. We fit the spatiotemporal variations in the two fields using an ansatz consisting of a superposition of Bessel functions, and report measurements of the wavenumbers and energy damping factors associated with the meniscus and Faraday waves, as well as the spatial and temporal phase shifts between them. While these measurements are largely consistent for both types of waves and both fields, it is notable that the damping factors for height and surfactant in the meniscus waves do not agree. This raises the possibility that there is a contribution from longitudinal waves in addition to the gravity-capillary waves.

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Section: Discussionmentioning

confidence: 97%

Spatiotemporal measurement of surfactant distribution on gravity–capillary waves

2015

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“…If we only consider acoustic waves while neglecting capillary waves, the horseshoe structure can be considered as a rigid cuboid with the interface as a flexible membrane. [33][34][35] For such a case, the resonant frequencies are calculated to be in the MHz range, 36 while it is observed experimentally that resonant frequencies are in kHz range. This confirms the dominance of capillary force over acoustic force on the interface in the frequency range that we employ (5-100 kHz).…”

Section: Theorymentioning

confidence: 97%

Theory and experiment on resonant frequencies of liquid-air interfaces trapped in microfluidic devices

Chindam

Nama

Lapsley

et al. 2013

Journal of Applied Physics

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Bubble-based microfluidic devices have been proven to be useful for many biological and chemical studies. These bubble-based microdevices are particularly useful when operated at the trapped bubbles' resonance frequencies. In this work, we present an analytical expression that can be used to predict the resonant frequency of a bubble trapped over an arbitrary shape. Also, the effect of viscosity on the dispersion characteristics of trapped bubbles is determined. A good agreement between experimental data and theoretical results is observed for resonant frequency of bubbles trapped over different-sized rectangular-shaped structures, indicating that our expression can be valuable in determining optimized operational parameters for many bubble-based microfluidic devices. Furthermore, we provide a close estimate for the harmonics and a method to determine the dispersion characteristics of a bubble trapped over circular shapes. Finally, we present a new method to predict fluid properties in microfluidic devices and complement the explanation of acoustic microstreaming. V C 2013 AIP Publishing LLC. [http://dx

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“…Due to the presence of an elastic pollution film at the surface, the stress boundary conditions are changed compared to the ideally clean case and the induced boundary layer is considerably more dissipative [19]. The pollution layer is deformed by fluctuations of the surface, and it is subject to compressive waves [20]. These waves, referred to as Marangoni waves, are the main cause of dissipation of surface waves through the boundary layer with a maximal efficiency at frequencies close to 4 Hz, at which a resonance appears between the dispersion relations of surface gravity waves and Marangoni waves [19,21].…”

Section: Introductionmentioning

confidence: 99%

Three-wave and four-wave interactions in gravity wave turbulence

et al. 2017

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The Weak Turbulence Theory is a statistical framework to describe a large ensemble of nonlinearly interacting waves. The archetypal example of such system is the ocean surface that is made of interacting surface gravity waves. Here we describe a laboratory experiment dedicated to probe the statistical properties of turbulent gravity waves. We setup an isotropic state of interacting gravity waves in the Coriolis facility (13 m diameter circular wave tank) by exciting waves at 1 Hz by wedge wavemakers. We implement a stereoscopic technique to obtain a measurement of the surface elevation that is resolved both in space and time. Fourier analysis shows that the laboratory spectra are systematically steeper than the theoretical predictions and than the field observations in the Black Sea by Leckler et al. JPO 2015. We identify a strong impact of surface dissipation on the scaling of the Fourier spectrum at the scales that are accessible in the experiments. We use bicoherence and tricoherence statistical tools in frequency and/or wavevector space to identify the active nonlinear coupling. These analyses are also performed on the field data by Leckler et al. for comparison with the laboratory data. 3-wave coupling are characterized and shown to involve mostly quasi resonances of waves with second or higher order harmonics. 4-wave coupling are not observed in the laboratory but are evidenced in the field data. We finally discuss temporal scale separation to explain our observations. * nicolas.mordant@univ-grenoble-alpes.fr 2

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The calming effect of oil on water

Cited by 29 publications

References 15 publications

Spatiotemporal measurement of surfactant distribution on gravity–capillary waves

Spatiotemporal measurement of surfactant distribution on gravity–capillary waves

Theory and experiment on resonant frequencies of liquid-air interfaces trapped in microfluidic devices

Three-wave and four-wave interactions in gravity wave turbulence

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