Convective Instability of a Zinc Sulfate Solution in a Cell
with Horizontal Plane-Parallel Electrodes

N. N. Tomashova, G. L. Teplitskaya, A. P. Grigin^†, and A. D. Davydov^z

Frumkin Institute of Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119071 Russia

Received January 20, 2004

Abstract—The Rayleigh–Bénard convective instability in a cell with horizontal zinc electrodes is considered.
The space between the electrodes is filled with a ZnSO₄ solution. The linear plot of the difference between the
zinc deposition currents (I) in the cases where the anode is the upper or lower electrode vs. the square root of
the zinc deposition current in the absence of convection is found experimentally. It is shown that the critical
Rayleigh number can be determined by an extrapolation of this plot.

Key words: Rayleigh–Bénard convective instability, critical Rayleigh number, zinc electrodes, buoyancy forces

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