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.
Fabrizio Croccolo 1 ; Frank Scheffold 1 ; Henri Bataller 2
@article{CRMECA_2013__341_4-5_378_0,
author = {Fabrizio Croccolo and Frank Scheffold and Henri Bataller},
title = {Mass transport properties of the tetrahydronaphthalene/\protect\emph{n}-dodecane mixture measured by investigating non-equilibrium fluctuations},
journal = {Comptes Rendus. M\'ecanique},
pages = {378--385},
publisher = {Elsevier},
volume = {341},
number = {4-5},
year = {2013},
doi = {10.1016/j.crme.2013.01.012},
language = {en},
}
TY - JOUR AU - Fabrizio Croccolo AU - Frank Scheffold AU - Henri Bataller TI - Mass transport properties of the tetrahydronaphthalene/n-dodecane mixture measured by investigating non-equilibrium fluctuations JO - Comptes Rendus. Mécanique PY - 2013 SP - 378 EP - 385 VL - 341 IS - 4-5 PB - Elsevier DO - 10.1016/j.crme.2013.01.012 LA - en ID - CRMECA_2013__341_4-5_378_0 ER -
%0 Journal Article %A Fabrizio Croccolo %A Frank Scheffold %A Henri Bataller %T Mass transport properties of the tetrahydronaphthalene/n-dodecane mixture measured by investigating non-equilibrium fluctuations %J Comptes Rendus. Mécanique %D 2013 %P 378-385 %V 341 %N 4-5 %I Elsevier %R 10.1016/j.crme.2013.01.012 %G en %F CRMECA_2013__341_4-5_378_0
Fabrizio Croccolo; Frank Scheffold; Henri Bataller. Mass transport properties of the tetrahydronaphthalene/n-dodecane mixture measured by investigating non-equilibrium fluctuations. Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 378-385. doi : 10.1016/j.crme.2013.01.012. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2013.01.012/
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