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Departures from the linear equation for vibrational relaxation in shock waves in oxygen and carbon dioxide

  • H. K. Zienkiewicz and N. H. Johannesen (a1)

Abstract

The detailed structure of the relaxation region in shock waves in oxygen was investigated using Blackman's experimental results. Oxygen was found to display a behaviour similar in many ways to that found previously for carbon dioxide with the relaxation frequency, as defined by the simple relaxation equation, depending on the departure from equilibrium as well as on temperature. The previous results for carbon dioxide were further analysed by means of a separate relaxation equation for each mode.

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References

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Blackman, V. H. 1956 Vibrational relaxation in oxygen and nitrogen. J. Fluid Mech. 1, 61.
Blythe, P. A. 1961 Comparison of exact and approximate methods for analysing vibrational relaxation regions. J. Fluid Mech. 10, 33.
Camac, M. 1961 O2 vibration relaxation in oxygen-argon mixtures. J. Chem. Phys. 34, 448.
Johannesen, N. H. 1961 Analysis of vibrational relaxation regions by means of the Rayleigh line method. J. Fluid Mech. 10, 25.
Johannesen, N. H., Zienkiewicz, H. K., Blythe, P. A. & Gerrard, J. H. 1962 Experimental and theoretical analysis of vibrational relaxation regions in carbon dioxide. J. Fluid Mech. 13, 213.
Zienkiewicz, H. K., Johannesen, N. H. & Gerrard, J. H. 1963 Further results on the over-all density ratios of shock waves in carbon dioxide. J. Fluid Mech. 17, 267.
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