A comprehensive study of diffusion, thermodiffusion, and Soret coefficients of water-isopropanol mixtures

Mialdun, Aliaksndr; Yasnou, Viktar; Shevtsova, Valentina; Königer, A.; Köhler, W.; Mezquıa, David Alonso de; Bou-Ali, M. Mounir

doi:10.1063/1.4730306

Cited by 86 publications

(84 citation statements)

References 37 publications

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“…The Soret coefficient measured in microgravity for the mixture with S T < 0 was approximately 15 % smaller than that measured in ground laboratories; see Mialdun et al (2012). This result can be partly attributed to the uncertainties in material properties and experimental conditions.…”

Section: Resultscontrasting

confidence: 62%

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

et al. 2015

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We examine the dynamics of a binary mixture in a cubic cell subjected to a temperature differential and oscillatory forcing. The Soret effect, which is negative in the present study, provides a coupling mechanism by which a temperature gradient establishes a concentration gradient in a mixture. We present the results of experiments that were performed on the International Space Station (ISS) and compare the observations with the results of direct numerical simulations. The evolution of temperature and concentration fields is investigated by optical digital interferometry. One advantage of the experimental technique is the observation of the fields along two perpendicular directions of the cell, allowing us to restore the three-dimensional field. Experimental evidence disproves speculations that the ISS microgravity environment always affects diffusion-controlled processes. Furthermore, we demonstrate that imposed vibrations with constant frequency and amplitude create slow mean flows and that they do influence the diffusion kinetics. The perturbation of the diffusive fields scales as the square of the vibrational velocity. In addition to calculations of the full three-dimensional Navier-Stokes equations, a two-time-scale computational methodology is used for situations in which the forcing period is very small compared to the natural time scales of the problem. The simulations show excellent agreement with experimental observations.

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Section: Resultscontrasting

confidence: 62%

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

et al. 2015

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“…The mixture viscosity is a function of concentration with a maximum atc o = 0.5 (Mialdun et al 2012). In the region of interest, 0.5 c 0.9, the viscosity can be approximated by a linear dependence.…”

Section: Mathematical Formulationmentioning

confidence: 99%

Dynamics of the interface between miscible liquids subjected to horizontal vibration

et al. 2015

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We present experimental evidence of the existence of an interfacial instability between two miscible liquids of similar (but non-identical) viscosities and densities under horizontal vibration. A stably stratified two-layer system is composed of the same binary mixture with different concentrations placed in a confined cell (with length twice as large as the height). Unlike the case of immiscible fluids, here, the interface is a transient layer of small but non-zero thickness. In the experiments, the frequency and amplitude were varied within the ranges 2-24 Hz and 1.5-16 mm, respectively. When the value of the oscillatory forcing increases, the amplitudes of the interface perturbations grow continuously, forming a saw-tooth frozen structure. This evolution is also examined numerically. In addition to the solutions of full 3-D Navier-Stokes equations, an averaging approach with separation of time scales is used for situations in which the forcing period is very small compared to the natural time scales of the problem. The simulation of averaged equations provides the explanation of the instability development, the calculations of the full nonlinear equations shed light on the decay of a wavy pattern. The results of numerical modelling perfectly support the experimental observations.

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“…Thermal diffusion effect is concentration separation in a liquid mixture as a response to the imposition of a thermal gradient. Measurements of thermal diffusion in binary mixtures are well established, 15,16 but the case of mula) Author to whom correspondence should be addressed. Electronic mail: vshev@ulb.ac.be ticomponent (even ternary) mixtures poses serious difficulties both from the experimental and the mathematical sides.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Fickian diffusion in the ternary mixture of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane

Mialdun

Sechenyh

Legros

et al. 2013

The Journal of Chemical Physics

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Diffusion, thermal diffusion, and Soret coefficients and optical contrast factors of the binary mixtures of dodecane, isobutylbenzene, and 1,2,3,4-tetrahydronaphthalene J. Chem. Phys. 138, 114503 (2013) We present a comprehensive analysis of experimental results obtained for Fickian diffusion in the benchmark ternary liquid mixture of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane (nC 12 ) with equal mass fractions. Isothermal diffusion coefficients have been measured by two independent experimental methods: by Taylor dispersion technique, and by a counter flow cell fitted with an optical interferometry device. The experimental diffusion matrices have been critically analyzed regarding the Onsager reciprocal relations, for which we introduce a matrix asymmetry index s 2 that is independent of the frame of reference and the component order. © 2013 AIP Publishing LLC.

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A comprehensive study of diffusion, thermodiffusion, and Soret coefficients of water-isopropanol mixtures

Cited by 86 publications

References 37 publications

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

Dynamics of the interface between miscible liquids subjected to horizontal vibration

Investigation of Fickian diffusion in the ternary mixture of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane

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