Abstract.
In the present work, the Soret coefficient has been determined at high pressure for a binary hydrocarbon mixture by combining the thermogravitational column and the dynamic near-field imaging techniques. The analyzed mixture is an iso-massic n -dodecane-n -hexane mixture at 298.15K. The molecular diffusion coefficient has been measured up to 20MPa by means of the dynamic analysis of the light scattered by non-equilibrium concentration fluctuations. With a cylindrical thermogravitational column the thermodiffusion coefficient was determined from 0.1MPa to 10MPa. Density, as well as, mass expansion and thermal expansion have been measured with a high pressure densimeter. Dynamic viscosity at up to 20MPa has been determined with a high pressure viscometer. This work shows the decreasing tendency of both the molecular diffusion and the thermodiffusion coefficient with increasing pressure.
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Lizarraga, I., Croccolo, F., Bataller, H. et al. Soret coefficient of the n-dodecane-n-hexane binary mixture under high pressure. Eur. Phys. J. E 40, 36 (2017). https://doi.org/10.1140/epje/i2017-11520-x
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DOI: https://doi.org/10.1140/epje/i2017-11520-x