Eur. Phys. J. E (2015) 38: 28
https://doi.org/10.1140/epje/i2015-15028-1

Regular Article

Contribution to the benchmark for ternary mixtures: Determination of Soret coefficients by the thermogravitational and the sliding symmetric tubes techniques

¹ Mechanical and Industrial Manufacturing Department, MGEP Mondragon Goi Eskola Politeknikoa, Loramendi 4 Apdo 23, 20500, Mondragon, Spain
² Department of Mechanical Engineering, University of Bath, Claverton Down, Bath, BA2 7AY, UK
³ Department of Applied Physics II, University of Basque Country, Apdo. 644, 48080, Bilbao, Spain
⁴ University of Mons-Hainaut, B-7000, Mons, Belgium

^* e-mail: mbouali@mondragon.edu

Received: 16 July 2014
Revised: 17 November 2014
Accepted: 12 February 2015
Published online: 28 April 2015

Abstract

This work is part of an international project for the research on the transport properties in ternary mixtures. Six different teams have analysed the same mixture by independent techniques in order to compare the results and validate the techniques. This work is the contribution of the team of Mondragon Unibertsitatea for ground conditions measurements. This team has measured the thermodiffusion coefficients by the thermogravitational techniques and the molecular diffusion coefficients by the Sliding Symmetric Tubes technique. The Soret coefficients have been determined by the combination of the thermodiffusion and molecular diffusion coefficients. The mixture chosen for the study is the one formed by 1,2,3,4-tetrahydronaphtalene, isobutylbenzene and n-dodecane at mass fraction of 80% of THN, 10% of IBB and 10% of n C₁₂, and at 25°C. The good agreement between the results of the different teams shows the validity of the techniques used in this work.