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Determination of Soret coefficient and heat of transport in a binary liquid mixture using X-ray microscopy

Published online by Cambridge University Press:  15 January 2002

S. Rondot ,
O. Aaboubi ,
P. Baudart ,
D. Erre ,
E. Mérienne  and
J. M. Patat
S. Rondot*
Affiliation:
DTI (UMR CNRS 6107) , Faculté des Sciences de Reims, BP 1039, 51687 Reims Cedex 2, France
O. Aaboubi
Affiliation:
DTI (UMR CNRS 6107) , Faculté des Sciences de Reims, BP 1039, 51687 Reims Cedex 2, France
P. Baudart
Affiliation:
DTI (UMR CNRS 6107) , Faculté des Sciences de Reims, BP 1039, 51687 Reims Cedex 2, France
D. Erre
Affiliation:
DTI (UMR CNRS 6107) , Faculté des Sciences de Reims, BP 1039, 51687 Reims Cedex 2, France
E. Mérienne
Affiliation:
DTI (UMR CNRS 6107) , Faculté des Sciences de Reims, BP 1039, 51687 Reims Cedex 2, France
J. M. Patat
Affiliation:
DTI (UMR CNRS 6107) , Faculté des Sciences de Reims, BP 1039, 51687 Reims Cedex 2, France
*
[email protected]
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Abstract

With a laboratory built X-ray microscope, analysis of a thermal diffusion process in a KBr solution has been performed. A solution of a salt submitted to a constant temperature gradient gives rise to a stationary concentration gradient of the species after a few hours: this is the so called Soret effect. From the digital image of the liquid, acquired in the steady state of the process, it is easy to obtain the concentration map of the species in the solution. The average concentration profile then deduced permits to reach the value of the Soret coefficient and the heat of transport of the binary compound. X-ray radiography is an alternative powerful technique to analyse this kind of complicated phenomenon where composition matter fluxes are driven by both temperature and composition gradient.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 17 , Issue 1 , January 2002 , pp. 75 - 80
Copyright
© EDP Sciences, 2002

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