Abstract
The influence of a static gravity level on Soret-driven convection of a ternary mixture in a square cavity heated from above is investigated. The problem is solved by the finite difference method using the equations of thermosolutal convection in multicomponent mixtures. These equation are transformed to a set of equations to eliminate the cross-diffusion effects and to reduce the number of governing parameters. Calculations are performed to study a ternary mixture with the components having different signs of the separation ratios at different levels of gravity. Due to the thermodiffusion effect, the component with a negative separation ratio moves to the upper (hot) wall. This leads to the development of instability accompanied by a sharp increase in the flow intensity and a sharp decrease in the concentration difference between the upper and lower boundaries. Numerical data on the time evolution of integral characteristics of flow and heat and mass transfer, and data on the structure fields of stream function and concentration at different times for different values of the Rayleigh number (different levels of gravity) are obtained.
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References
Mialdun, A., Shevtsova, V.M.: Development of optical digital interferometry technique for measurement of thermodiffusion coefficients. Int. J. Heat Mass Trans. 51, 3164–3178 (2008)
Leahy-Dios, A., Firoozabadi, A.: Molecular and thermal diffusion coefficients of alkane-alkane and alkane-aromatic binary mixtures: effect of shape and size of molecules. J. Phys. Chem. B 111, 191–198 (2007)
Shevtsova, V.M., Melnikov, D.E., Legros, J.C.: Onset of convection in Soret-driven instability. Phys. Rev. E 73, 047302 (2006).
Shevtsova, V.M., Melnikov, D.E., Legros, J.C., Yan, Y., Saghir, Z., Lyubimova, T., Sedelnikov, G., Roux, B.: Influence of vibrations on thermodiffusion in binary mixture: a benchmark of numerical solutions. Phys. Fluids 19, 017111 (2007).
Firoozabadi, A., Ghorayeb, K.: Modeling multicomponent diffusion and convection in porous media. SPE J. 5(2), 158–171 (2000)
Ryzhkov, I.I., Shevtsova, V.M.: Long-wave instability of a multicomponent fluid layer with the Soret effect. Phys. Fluids 21, 014102 (2009).
Thom, A., Apelt, C.J.: Field computations in engineering and physics. Van Nostrand, London (1961)
Acknowledgments
This work was supported by Perm Region Government (Contract C-26/212), Ural Branch of Russian Academy of Sciences (project N12-P-1-1026) and President of Russian Federation (grant 4022.2014.1 for the support of Leading Scientific Schools).
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Lyubimova, T.P., Zubova, N.A. Onset of Convection in a Ternary Mixture in a Square Cavity Heated from Above at Various Gravity Levels. Microgravity Sci. Technol. 26, 241–247 (2014). https://doi.org/10.1007/s12217-014-9383-z
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DOI: https://doi.org/10.1007/s12217-014-9383-z