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Mass diffusion and Soret coefficient measurements of triethylene glycol/water binary mixtures by dynamic shadowgraphy

A. Ndjaka 1, 2 L. García-Fernández D. Bouyou 1 Arnault Lassin 1, 2 Mohamed Azaroual 3, 4, 2 Fabrizio Croccolo 1 Henri Bataller 1
1 LFCR - Laboratoire des Fluides Complexes et leurs Réservoirs
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
4 Milieux Poreux - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327
Abstract : The investigation of the transport properties of binary fluid mixtures remains a topic of interest in relation to the more challenging studies of ternary mixtures. In fact, the study of the phase boundary limits of the Gibbs composition triangle can be the initial step for a more complete analysis of ternary mixtures. In this paper, we apply the dynamic shadowgraphy optical technique to study non-equilibrium fluctuations induced by the presence of a gradient of temperature and/or concentration in the triethylene glycol (TEG)/water system. These thermodiffusion and free-diffusion experiments aim at measuring the transport properties of samples of the studied system at different experimental conditions. We scan both the average temperature and the TEG concentration, which allows us investigating both positive and negative thermodiffusive behaviours. The obtained values of mass diffusion coefficient are consistent with data available in the literature in the range of temperature investigated in this study. The mass diffusion coefficient of the sample prepared at 0.7 w/w TEG concentration are characterised by shadowgraphy following the two proposed methods, exhibiting consistent results. An increase of the mass diffusion coefficient as a function of the average temperature is highlighted. On the other hand, the thermodiffusion coefficient appears to be independent of the average temperature of the sample at 0.3 w/w TEG concentration.
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Submitted on : Monday, March 28, 2022 - 10:24:07 AM
Last modification on : Tuesday, May 10, 2022 - 3:25:01 PM

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A. Ndjaka, L. García-Fernández, D. Bouyou, Arnault Lassin, Mohamed Azaroual, et al.. Mass diffusion and Soret coefficient measurements of triethylene glycol/water binary mixtures by dynamic shadowgraphy. European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2022, 45 (3), pp.20. ⟨10.1140/epje/s10189-022-00171-9⟩. ⟨insu-03621333⟩

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