OSCILLATORY AND MONOTONIC INSTABILITY AT THE BOUNDARY 
OF THE TRANSITION "MOLECULAR DIFFUSION-CONCENTRATION 
CONVECTION" IN TERNARY GAS MIXTURES
V. N. Kosov, V. D. Seleznev, and Yu. I. Zhavrin

UDC 533.15:536.25

It is shown by a linear analysis for stability that 
for partial Rayleigh numbers R1 and R2 that have different signs, 
there exist two anomalous regions with monotonic (R1 < 0 ), R2 > 0) 
and oscillatory (R1 > 0, R2 < 0) instability 
where the density at the bottom is higher than at the top. 
The experimental data obtained confirm the presence 
of these two regions of instability, and the position of the stability 
boundaries is well described by the given theory for mixtures with 
a linear distribution of the concentration. For systems with a pronounced 
nonlinearity in the distribution of the concentrations, agreement 
between theory and experiment is violated.

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