Development of the shadowgraph method for the accurate determination of diffusivities of fluid mixtures under high pressures and high temperatures
Final Report Abstract
In the first funding period, it has been shown for the first time that the shadowgraph method allows the simultaneous determination of the Fick diffusion coefficient D11, the thermal diffusivity a, the Soret coefficient ST, and the kinematic viscosity ν of fluid mixtures in a single thermodiffusion experiment by the analysis of the dynamics of non-equilibrium fluctuations. Considering restrictions regarding ST and ν and refining the available experimental and data evaluation approach, the second funding period aimed at the accurate determination of D11 and a in binary mixtures exhibiting a broad range of ST and signal intensities. After a revision of the experimental setup to increase the accessible temperature and concentration gradients, studies on mixtures with systematically varied ST and refractive index differences of their pure components helped to achieve this goal. On this basis, 99 D11 and 140 a data for binary hydrocarbon mixtures were determined with average uncertainties of (12.9 and 8.0)% over a wide range of temperatures and pressures, from which structure-property relationships were derived.
Publications
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Determination of diffusivities in binary fluid mixtures with various Lewis numbers as well as positive and negative Soret coefficients by the shadowgraph method. The Journal of Chemical Physics, 159(7).
Wu, W.; Schmidt, P. S.; Piszko, M.; Giraudet, C.; Rausch, M. H. & Fröba, A. P.
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Fick diffusion coefficients probed by the shadowgraph method considering confinement and advection. The Journal of Chemical Physics, 158(9).
Schmidt, P. S.; Wu, W.; Rausch, M. H. & Fröba, A. P.
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Evaluation of the shadowgraph method for the determination of mutual and thermal diffusivities. The Journal of Chemical Physics, 161(4).
Schmidt, Patrick S.; Rausch, Michael H.; Wu, Wenchang & Fröba, Andreas P.
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Fick Diffusion Coefficients and Thermal Diffusivities in Binary Liquid Mixtures Containing Alkanes and/or Cyclic Hydrocarbons by Using the Shadowgraph Method. Journal of Chemical & Engineering Data, 69(9), 3001-3016.
Schmidt, Patrick S.; Huang, Xiaohan & Fröba, Andreas P.
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Fick Diffusion Coefficients in Binary Liquid Mixtures Containing Alkanes, Aromatics, Alcohols, or Acetone by Using Dynamic Light Scattering. Journal of Chemical & Engineering Data, 69(4), 1578-1590.
Schmidt, Patrick S.; Piszko, Maximilian & Fröba, Andreas P.
