Study of mass transfer enhancement on liquid/liquid interface by flow instabilities using gallium liquid electrode |
| |
Authors: | G Cognet S Martemyanov |
| |
Institution: | (1) Laboratory SIMAP, EPM-Madylam group, Institut National Polytechnique de Grenoble, 1340 rue de la piscine-Domaine Universitaire, 38402 Saint Martin d’Heres, France;(2) Laboratory of Heat Studies, UMR CNRS n 6008, Saint Martin d’Heres, France;(3) University of Poitiers 40, avenue du Recteur Pineau, 86022 Poitiers Cedex, France |
| |
Abstract: | Abstrac Using liquid gallium electrodes it was proved that electrodiffusion method is a convenient tool for measuring the mass transfer
at liquid/liquid interface. It was shown that mass transfer coefficient at the liquid/liquid interface at high Reynolds numbers
is much more important in comparison to that measured at the solid/liquid interface at identical geometrical and hydrodynamic
conditions. In experiments with the flow induced by the rotation of the upper disc (working ring electrode is placed on the
bottom of the immobile disc), the Sherwood number increases in turbulent regime as Sh ∼ Re1.8 at the liquid/liquid interface, contrary to the traditional law Sh ∼ Re0.9 at the solid/liquid interface. In laminar regime the Sherwood number at the liquid/liquid and at the solid/liquid interfaces
follows the traditional dependence Sh ∼ Re0.5. It was shown that sharp increasing of the mass transfer coefficient at the liquid/liquid interface is closely related with
the appearance of the surface waves, the phenomenon is identified as a Kelvin-Helmholtz type instability.
Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 4, pp. 482–490.
The text was submitted by the authors in English. |
| |
Keywords: | liquid/liquid interface mass transfer electrodiffusion method gallium electrode flow instability |
本文献已被 SpringerLink 等数据库收录! |
|