The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00007382
URN to cite this document: urn:nbn:de:bvb:703-epub-7382-8

Title data

Köhler, Werner ; Mialdun, A. ; Bou-Ali, M. M. ; Shevtsova, V.:
The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures.
In: International Journal of Thermophysics. Vol. 44 (2023) Issue 9 . - 140.
ISSN 1572-9567
DOI der Verlagsversion: https://doi.org/10.1007/s10765-023-03242-x

	Format: PDF Name: s10765-023-03242-x.pdf Version: Published Version Available under License Creative Commons BY 4.0: Attribution
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Abstract

This review provides an overview of the major, currently used techniques for investigating the Soret effect and measuring thermodiffusion and Soret coefficients, and in most cases also isothermal Fickian diffusion coefficients, in liquid mixtures. The methods are introduced with a focus on binary mixtures. The optical methods comprise optical beam deflection (OBD), optical digital interferometry (ODI) both on the ground and under microgravity conditions in the SODI-IVIDIL experiment for the study of the influence of vibrations onboard the International Space Station, which are all based on Soret cells. The transient holographic grating technique of thermal diffusion-forced Rayleigh scattering (TDFRS) employs light not only for detection of the concentration changes but also for optical volume heating. Thermogravitational columns (TGC) utilize the coupling between convection and thermodiffusion to create concentration changes inside a vertical column with a horizontal temperature gradient. While samples are analyzed after extraction from the column in a classical setup, the recently developed transparent microcolumn allows for interferometric in situ monitoring of the concentration field. The most recent technique relies on the measurement of giant non-equilibrium fluctuations (NEFs) by small-angle light scattering techniques. Research on ternary mixtures, both on the ground and in microgravity, has gained momentum in the context of the DCMIX microgravity project of ESA. Most techniques employed for binaries can be extended to ternaries by introducing a second detection color or by analyzing both refractive index and density of extracted TGC samples. The accuracy is limited by the unavoidable inversion of the so-called contrast factor matrix.

Further data

Item Type:	Article in a journal
Keywords:	Diffusion; Microgravity; Soret effect; Ternary mixtures; Thermodiffusion
DDC Subjects:	500 Science > 530 Physics
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors > Professor Experimental Physics IV - Univ.-Prof. Dr. Werner Köhler Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics IV Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-7382-8
Date Deposited:	19 Dec 2023 08:34
Last Modified:	19 Dec 2023 08:34
URI:	https://epub.uni-bayreuth.de/id/eprint/7382

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