Model and experimental studies of gravitational convection in an electromembrane cell

Author： Pismensky A. Urtenov M. Nikonenko V. Sistat Ph. Pismenskaya N. Kovalenko A.

ISSN： 1023-1935

Source： Russian Journal of Electrochemistry, Vol.48, Iss.7, 2012-07, pp. : 756-766

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Abstract

The model and experimental studies of the effect of gravitational convection on transport processes in an electromembrane cell are carried out. A model of an unsteady process of binary electrolyte transfer in moderately dilute solutions in an electromembrane cell for underlimiting current modes with allowance made for the natural and forced convection is built in the form of a system of two-dimensional equations of Navier-Stokes, Nernst-Planck, thermal conductivity, and electric current continuity. The dynamics of the appearance and development of vortex structures that arise in response to operation of gravitational archimedian forces is considered as well as their effect on the transfer of salt ions. Chronoampero- and chronopotentiograms obtained in an experimental study of desalination channels in electromembrane systems are interpreted.