Eur. Phys. J. E 37, 107 (2014)

http://link.springer.com/article/10.1140/epje/i2014-14107-1

High-pressure mass transport properties measured by dynamic near-field scattering of non-equilibrium fluctuations

Cédric Giraudet, Henri Bataller and Fabrizio Croccolo

High-pressure mass diffusion and Soret coefficients of the equimassic 1,2,3,4-tetrahydronaphthalene and n-dodecane binary mixture are obtained from dynamic light scattering analysis of concentration non-equilibrium fluctuations at the steady state of Soret-driven separation. A high-pressure shadowgraph set-up has been developed to investigate thermodiffusion in free medium from atmospheric pressure up to 20MPa. Results at atmospheric pressure show excellent agreement with benchmark values. High-pressure results for the mass diffusion coefficient confirm theoretical predictions by Leffler-Cullinan relation. Further calculation of the thermodiffusion coefficient allows also comparison with previous experimental results with, again, very good agreement.