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Article Dans Une Revue Russian Journal of Electrochemistry Année : 2008

Study of Mass Transfer Enhancement on Liquid/liquid Interface by Flow Instabilities Using Gallium Liquid Electrode

Résumé

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 – Re 0.5. 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.
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Dates et versions

hal-00289079 , version 1 (19-06-2008)

Identifiants

  • HAL Id : hal-00289079 , version 1

Citer

G. Cognet, S. Martemianov. Study of Mass Transfer Enhancement on Liquid/liquid Interface by Flow Instabilities Using Gallium Liquid Electrode. Russian Journal of Electrochemistry, 2008, 44 (4), pp.445-452. ⟨hal-00289079⟩
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