Eur. Phys. J. E (2014) 37: 107
https://doi.org/10.1140/epje/i2014-14107-1

Regular Article

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

Laboratoire des Fluides Complexes et leurs Réservoirs, UMR 5150, Université de Pau et des Pays de l’Adour, 64600, Anglet, France

^* e-mail: henri.bataller@univ-pau.fr

Received: 19 September 2014
Revised: 21 October 2014
Accepted: 22 October 2014
Published online: 19 November 2014

Abstract

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.