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Oscillatory and monotonic instability at the boundary of the transition ‘molecular diffusion-concentration convection’ in ternary gas mixtures

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Abstract

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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Authors and Affiliations

  1. Al-Farabi Kazakh State National University, Almaty, Kazakhstan

    V. N. Kosov, V. D. Seleznev & Yu. I. Zhavrin

Authors
  1. V. N. Kosov
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  2. V. D. Seleznev
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  3. Yu. I. Zhavrin
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Additional information

Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 73, No. 2, pp. 313–320, March–April, 2000.

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Kosov, V.N., Seleznev, V.D. & Zhavrin, Y.I. Oscillatory and monotonic instability at the boundary of the transition ‘molecular diffusion-concentration convection’ in ternary gas mixtures. J Eng Phys Thermophys 73, 303–310 (2000). https://doi.org/10.1007/BF02681735

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  • DOI: https://doi.org/10.1007/BF02681735

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