Experimental investigation of turbulent mixing by Rayleigh-Taylor instability

Read, K.

doi:10.1016/0167-2789(84)90513-x

Cited by 471 publications

(283 citation statements)

References 6 publications

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“…To examine threedimensional turbulent mixing layers, Read (1984) used rockets to accelerate an initially stable stratified mixture downwards. He obtained accelerations of 25g -75g by using this method.…”

Section: Index For Fluidsmentioning

confidence: 99%

Statistically steady measurements of Rayleigh-Taylor mixing in a gas channel

Banerjee

Andrews

2006

Physics of Fluids

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A novel gas channel experiment was constructed to study the development of high Atwood number Rayleigh-Taylor mixing. Two gas streams, one containing air and the other containing helium-air mixture, flow parallel to each other separated by a thin splitter plate. The streams meet at the end of a splitter plate leading to the formation of an unstable interface and of buoyancy driven mixing. This buoyancy driven mixing experiment allows for long data collection times, short transients and was statistically steady. The facility was designed to be capable of large Atwood number studies of AB t B ~ 0.75. We describe work to measure the self similar evolution of mixing at density differences corresponding to 0.035 < AB t B < 0.25. Diagnostics include a constant temperature hot-wire anemometer, and high resolution digital image analysis. The hot-wire probe gives velocity, density and velocity-density statistics of the mixing layer. Two different multi-position single-wire techniques were used to measure the velocity fluctuations in three mutually perpendicular directions. Analysis of the measured data was used to explain the mixing as it develops to a self-similar regime in this flow. These measurements are to our iv knowledge, the first use of hot-wire anemometry in the Rayleigh-Taylor community.Since the measurement involved extensive calibration of the probes in a binary gas mixture of air and helium, a new convective heat transfer correlation was formulated to account for variable-density low Reynolds number flows past a heated cylinder. In addition to the hot-wire measurements, a digital image analysis procedure was used to characterize various properties of the flow and also to validate the hot-wire measurements. A test of statistical convergence was performed and the study revealed that the statistical convergence was a direct consequence of the number of different large three-dimensional structures that were averaged over the duration of the run.

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Section: Index For Fluidsmentioning

confidence: 99%

Statistically steady measurements of Rayleigh-Taylor mixing in a gas channel

Banerjee

Andrews

2006

Physics of Fluids

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“…Although the implosion proceeds mainly by a series of shocks and constant accelerations, A third reason for this study is that time-dependent effects appear even in experiments designed principally for constant accelerations, as in the original rocket-rig experiments on turbulent mixing by RT instabilities [4]. More recently, experiments have been performed [5,6] with several deliberately chosen time-dependent s t g ) ' ( .…”

Section: Introduction Motivation and Notationmentioning

confidence: 99%

Analytic approach to nonlinear hydrodynamic instabilities driven by time-dependent accelerations

Mikaelian

2010

Phys. Rev. E

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“…With regard to the characteristic ∂η ∂t , Mikaelian (2014) defines three stages of the RayleighTaylor instability in the form of linear, nonlinear and turbulent regimes. At the transition of nonlinear to turbulent regime (later time steps at η(wavelength λ) = λ 2π , Anuchina et Al., 1978;Kordilla, 2014), the interface amplitude change can be described mathematically as follows (Read, 1984;Youngs, 1984):…”

Section: Model Validationmentioning

confidence: 99%

Development of a numerical workflow based on <i>μ</i>-CT imaging for the determination of capillary pressure–saturation-specific interfacial area relationship in 2-phase flow pore-scale porous-media systems: a case study on Heletz sandstone

Peche¹,

Halisch²,

Tatomir³

et al. 2016

Solid Earth

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Abstract. In this case study, we present the implementation of a finite element method (FEM)-based numerical porescale model that is able to track and quantify the propagating fluid-fluid interfacial area on highly complex microcomputed tomography (µ-CT)-obtained geometries. Special focus is drawn to the relationship between reservoir-specific capillary pressure (p c ), wetting phase saturation (S w ) and interfacial area (a wn ). The basis of this approach is highresolution µ-CT images representing the geometrical characteristics of a georeservoir sample. The successfully validated 2-phase flow model is based on the Navier-Stokes equations, including the surface tension force, in order to consider capillary effects for the computation of flow and the phase-field method for the emulation of a sharp fluid-fluid interface.In combination with specialized software packages, a complex high-resolution modelling domain can be obtained. A numerical workflow based on representative elementary volume (REV)-scale pore-size distributions is introduced. This workflow aims at the successive modification of model and model set-up for simulating, such as a type of 2-phase problem on asymmetric µ-CT-based model domains. The geometrical complexity is gradually increased, starting from idealized pore geometries until complex µ-CT-based pore network domains, whereas all domains represent geostatistics of the REV-scale core sample pore-size distribution. Finally, the model can be applied to a complex µ-CT-based model domain and the p c -S w -a wn relationship can be computed.

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Experimental investigation of turbulent mixing by Rayleigh-Taylor instability

Cited by 471 publications

References 6 publications

Statistically steady measurements of Rayleigh-Taylor mixing in a gas channel

Statistically steady measurements of Rayleigh-Taylor mixing in a gas channel

Analytic approach to nonlinear hydrodynamic instabilities driven by time-dependent accelerations

Development of a numerical workflow based on <i>μ</i>-CT imaging for the determination of capillary pressure–saturation-specific interfacial area relationship in 2-phase flow pore-scale porous-media systems: a case study on Heletz sandstone

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Experimental investigation of turbulent mixing by Rayleigh-Taylor instability

Cited by 471 publications

References 6 publications

Statistically steady measurements of Rayleigh-Taylor mixing in a gas channel

Statistically steady measurements of Rayleigh-Taylor mixing in a gas channel

Analytic approach to nonlinear hydrodynamic instabilities driven by time-dependent accelerations

Development of a numerical workflow based on &lt;i&gt;μ&lt;/i&gt;-CT imaging for the determination of capillary pressure–saturation-specific interfacial area relationship in 2-phase flow pore-scale porous-media systems: a case study on Heletz sandstone

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Development of a numerical workflow based on <i>μ</i>-CT imaging for the determination of capillary pressure–saturation-specific interfacial area relationship in 2-phase flow pore-scale porous-media systems: a case study on Heletz sandstone