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Title
A ternary mixture at the border of Soret separation stability
Author
Prokopev, Sergei
Lyubimova, Tatyana
Mialdun, Aliaksandr
Shevtsova, Valentina
Research Group
Mecánica de fluidos
Other institutions
Ikerbasque
Institute of Continuous Media Mechanics UB RAS
Perm State University (Russia)
Université Libre de Bruxelles
Version
Postprint
Rights
© 2021 Royal Society of Chemistry
Access
Open access
URI
https://hdl.handle.net/20.500.11984/6985
Publisher’s version
https://doi.org/10.1039/D0CP06471H
Published at
Physical Chemistry Chemical Physics  Vol. 23. N. 14.
xmlui.dri2xhtml.METS-1.0.item-publicationfirstpage
8466
xmlui.dri2xhtml.METS-1.0.item-publicationlastpage
8477
Publisher
Royal Society of Chemistry
Subject (UNESCO Thesaurus)
Thermodynamics
UNESCO Classification
Thermodynamics
Abstract
Ternary mixtures with the Soret effect are prone to triple-diffusive convection in a thermal field. The Soret coefficients of the toluene–methanol–cyclohexane mixture, measured in microgravity at a gi ... [+]
Ternary mixtures with the Soret effect are prone to triple-diffusive convection in a thermal field. The Soret coefficients of the toluene–methanol–cyclohexane mixture, measured in microgravity at a given composition [0.62–0.31–0.07] in mass fractions, showed that the net separation ratio, Ψ, the parameter responsible for the hydrodynamic stability in a gravity field is close to zero. Furthermore, the large cross-diffusion of toluene leads to a curious situation: the Soret coefficient ST1 is positive while the thermodiffusion coefficient DT1 is negative. The behavior of this ternary mixture on the border of stability, when Ψ is slightly negative or positive, is examined experimentally and numerically. The mixture is placed in an elongated cell between the differently heated walls. Depending on Ψ and the initial temperature of the liquid (mean temperature, linear profile or cold one), the evolution of concentration patterns are classified by four regimes. We observe the emergence of motionless, metastable, and convective patterns. In the case of Ψ > 0, it was found that cross-diffusion fluxes cause a temporarily unstable density pattern. The initially cold mixture at either Ψ sign shows dissimilar Soret separation in the upper and lower parts of the cell. It leads to the formation of a long-lived inverse density gradient at the upper part of the cell, which finally results in a motionless (Ψ > 0) or convective (Ψ < 0) pattern. [-]
Funder
Gobierno Vasco
Program
Programa Elkartek 2019
Number
KK-2019-00101
Award URI
Sin información
Project
Microsistemas inteligentes avanzados e integrados en la industria. Monitorización, digitalización e inspección preventiva en entornos de producción (µ4INDUST)
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  • Articles - Engineering [742]

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