The present work demonstrates that by the analysis of the dynamics of non-equilibrium fluctuations using the shadowgraph method, the thermal diffusivity, the Fick diffusion coefficient, the kinematic viscosity, and the Soret coefficient of a binary mixture can be determined from a single thermodiffusion experiment. The study was performed for a mixture consisting of equal masses of 1,2,3,4-tetrahydronaphthalene and n-dodecane in a newly developed shadowgraph apparatus at temperatures up to 373 K and pressures up to 40 MPa. The obtained results are mainly discussed in the light of their uncertainties at varying thermodynamic states for evaluating the benefits, drawbacks, and potentials of the apparatus. The Fick diffusion coefficient and the thermal diffusivity obtained with average expanded uncertainties of 2.8% and 6.6% agree with literature data and measurements for the same mixture taken by heterodyne dynamic light scattering. Current limitations of the method are reflected by the distinctly larger uncertainties of the kinematic viscosity and the Soret coefficient. Corresponding reasons and potential measures to overcome the limitations are discussed.
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14 October 2020
Research Article|
October 08 2020
Simultaneous determination of multiple transport properties over a wide range of temperatures and pressures from the analysis of non-equilibrium fluctuations by the shadowgraph method
W. Wu
;
W. Wu
Institute of Advanced Optical Technologies—Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
, Paul-Gordan-Straße 8, 91052 Erlangen, Germany
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J. H. Jander
;
J. H. Jander
Institute of Advanced Optical Technologies—Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
, Paul-Gordan-Straße 8, 91052 Erlangen, Germany
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M. H. Rausch
;
M. H. Rausch
Institute of Advanced Optical Technologies—Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
, Paul-Gordan-Straße 8, 91052 Erlangen, Germany
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A. P. Fröba
;
A. P. Fröba
a)
Institute of Advanced Optical Technologies—Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
, Paul-Gordan-Straße 8, 91052 Erlangen, Germany
a)Author to whom correspondence should be addressed: andreas.p.froeba@fau.de. Tel.: +49-9131-85-29789. Fax: +49-9131-85-25878
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C. Giraudet
C. Giraudet
b)
Institute of Advanced Optical Technologies—Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
, Paul-Gordan-Straße 8, 91052 Erlangen, Germany
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a)Author to whom correspondence should be addressed: andreas.p.froeba@fau.de. Tel.: +49-9131-85-29789. Fax: +49-9131-85-25878
b)
Current address: Université de Pau et des Pays de l’Adour, E2S UPPA, CNRS, Total, LFCR, Allée du Parc Montaury, 64600 Anglet, France.
J. Chem. Phys. 153, 144201 (2020)
Article history
Received:
August 07 2020
Accepted:
September 18 2020
Citation
W. Wu, J. H. Jander, M. H. Rausch, A. P. Fröba, C. Giraudet; Simultaneous determination of multiple transport properties over a wide range of temperatures and pressures from the analysis of non-equilibrium fluctuations by the shadowgraph method. J. Chem. Phys. 14 October 2020; 153 (14): 144201. https://doi.org/10.1063/5.0024503
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