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Proceedings Paper

Study By Holographic Interferometry Of Mass Transfer During Electrochemical Processes At Solid-Liquid Interfaces
Author(s): Michael Clifton; Victor Sanchez; Christian Durou
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Paper Abstract

In electrochemical processes at solid-liquid interfaces, one of the main factors controlling mass transfer is the formation of boundary layers. These layers have a thickness between 0.15 and 0.7 mm, depending on the flow velocity of the liquid. Classical electrochemical techniques only give overall measurements of mass transfer; the aim of this study was to measure local mass transfer using holographic interferometry in real time, a technique particularly well adapted to the use of cells with complex forms. Two processes were observed: electrolysis and electrodialysis. The refractive index profile in the boundary layer was observed as a function of the liquid flow-rate and the applied difference in potential. Because of high refractive-index gradients in the boundary layer, the observed profile may be considerably distorted by light-deflection effects. Calculations have shown, however, that light-deflection errors may be kept within tolerable limits by using sufficiently dilute solutions. These solutions of limited concentration still allow useful results to be obtained.

Paper Details

Date Published: 18 April 1978
PDF: 5 pages
Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); doi: 10.1117/12.956151
Show Author Affiliations
Michael Clifton, Universite Paul Sabatier (France)
Victor Sanchez, Universite Paul Sabatier (France)
Christian Durou, Universite Paul Sabatier (France)

Published in SPIE Proceedings Vol. 0136:
1st European Conf on Optics Applied to Metrology
Michel H. Grosmann; Patrick Meyrueis, Editor(s)

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