A light scattering study of non equilibrium fluctuations in liquid mixtures to measure the Soret and mass diffusion coefficient

Croccolo, Fabrizio; Bataller, Henri; Scheffold, Frank

doi:10.1063/1.4771872

Cited by 75 publications

(80 citation statements)

References 42 publications

(69 reference statements)

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“…The presented results are in very good agreement with the reference data from [71]. A larger and more quantitative study has been performed over the last months using several other mixtures of the Fointainebleu benchmark and an extended paper containing all the data sets has been published recently [72]. In summary, the method outlined in this manuscript is capable of providing a measurement of the main mass transport properties of the analyzed fluid mixture without previous knowledge of the so-called optical contrast factors of the mixture ∂n/∂ T and ∂n/∂c.…”

Section: Soret and Mass Diffusion Coefficientsupporting

confidence: 74%

Mass transport properties of the tetrahydronaphthalene/n-dodecane mixture measured by investigating non-equilibrium fluctuations

Croccolo

Scheffold

Bataller

2013

Comptes Rendus. Mécanique

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We present preliminary near-field light scattering (NFS) data concerning the analysis of the static power spectrum and of the relaxation time constant as a function of the wave vector for non-equilibrium fluctuations (NEFs). The goal of these measurements is to obtain information about the Soret and the mass diffusion coefficients of a binary mixture undergoing thermodiffusion. In particular, we show how the interaction between NEFs and the gravity force gives rise to a critical wavelength that provides additional information about the Soret coefficient. We suggest that a quantitative analysis can be performed by means of this non-invasive optical technique. In our setup, the sample is monitored parallel to the imposed temperature gradient, thus being insensitive to the refractive index profile along the vertical axis, while at the same time we are able to detect the light scattered by the refractive index fluctuations in horizontal planes. We select a shadowgraph layout for the NFS setup due to the extremely small wave vectors we aim to analyze. From a double-frame differential analysis of the acquired images, we obtain both the static power spectrum and the dynamics of NEFs. As a proof-of-principle experiment, we present Soret and diffusion coefficient data on a liquid mixture of tetrahydronaphthalene/n-dodecane.

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Section: Soret and Mass Diffusion Coefficientsupporting

confidence: 74%

Mass transport properties of the tetrahydronaphthalene/n-dodecane mixture measured by investigating non-equilibrium fluctuations

Croccolo

Scheffold

Bataller

2013

Comptes Rendus. Mécanique

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“…-ground experiments (Croccolo et al 2012;Urteaga et al 2012;Giraudet et al 2014;Larrañaga et al 2015) on thermodiffusion in ternary mixtures that will take advantage of an extension of the theory of nonequilibrium fluctuations in ternary mixtures (Ortiz de Zárate et al 2014), -Molecular Dynamics (MD) simulations of thermodiffusion in multicomponent mixtures in bulk (Galliero et al 2003;Galliero et al 2009;Artola and Rousseau 2013) and confined situations (Galliero et al 2006;Hannaoui et al 2013), -developing models to take into account thermodiffusion when describing the initial state of a reservoir (Montel et al 2007;Touzet et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Impact of Thermodiffusion on the Initial Vertical Distribution of Species in Hydrocarbon Reservoirs

Galliéro

Bataller

Croccolo

et al. 2015

Microgravity Sci. Technol.

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In this work we propose a methodology, based on molecular dynamics simulations, to quantify the influence of segregation and thermodiffusion on the initial state distribution of the fluid species in hydrocarbon reservoirs. This convection-free approach has been applied to a synthetic oil composed of three normal alkanes and to a real acid gas. It has been found that the thermodiffusion effect induced by the geothermal gradient is similar (but opposite in sign) to that due to segregation for both mixtures. In addition, because of the combined effect of thermal expansion Guillaume Galliero guillaume.galliero@univ-pau.fr and thermodiffusion, it has been observed that the density gradient can be reversed, in the presence of a geothermal gradient. These numerical results emphasize the need of improving our quantification of thermodiffusion in multicomponent mixtures. The SCCO-SJ10 experiments will be a crucial step towards this goal.

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“…Thus, the fastest decay rate Γ 2 (q) = γ 2 (q) q 2 exhibits a minimum for a certain q, a feature that (for binary mixtures) has been proposed to measure the Soret effect [33,34]. However, one important consequence of eq.…”

Section: Decay Ratesmentioning

confidence: 92%

“…We have also performed the full calculation, retaining all the terms in the random force of eq. (33). The results are quite involved and not easily expressed as compact expressions, like those in sect.…”

Section: Further Considerationsmentioning

confidence: 99%

“…This question is not only relevant on theoretical grounds. The experimental investigation of the dynamics of NE concentration fluctuations has been used as a method to simultaneously measure diffusion and thermal diffusion coefficients in a binary mixture [33,34]. To extend such a method to multi-component mixtures, it is needed to understand the effects of buoyancy on NE fluctuations, starting with ternary mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Gravity effects on Soret-induced non-equilibrium fluctuations in ternary mixtures

Pancorbo¹,

Zárate²,

Bataller³

et al. 2017

Eur. Phys. J. E

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Abstract.We discuss the gravity effects on the dynamics of composition fluctuations in a ternary mixture around the non-equilibrium quiescent state induced by thermodiffusion when subjected to a stationary temperature gradient. We found that the autocorrelation matrix of concentration fluctuations can be expressed as the sum of two exponentially decaying concentration modes. Without accounting for confinement, we obtained exact analytical expressions for the two decay rates which, as a consequence of gravity, display a wave-number-dependent mixing. The stability of the quiescent solution is also examined, as a function of the two solutal Rayleigh numbers used to express the decay rates. After having discussed the dynamics of the two concentration modes, we calculate the corresponding amplitudes. Consequences for optical experiments are discussed.

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A light scattering study of non equilibrium fluctuations in liquid mixtures to measure the Soret and mass diffusion coefficient

Cited by 75 publications

References 42 publications

Mass transport properties of the tetrahydronaphthalene/n-dodecane mixture measured by investigating non-equilibrium fluctuations

Mass transport properties of the tetrahydronaphthalene/n-dodecane mixture measured by investigating non-equilibrium fluctuations

Impact of Thermodiffusion on the Initial Vertical Distribution of Species in Hydrocarbon Reservoirs

Gravity effects on Soret-induced non-equilibrium fluctuations in ternary mixtures

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