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Thermodynamic and Transport Properties of Two-temperature Oxygen Plasmas

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Abstract

Thermodynamic and transport properties of two-temperature oxygen plasmas are presented. Variation of species densities, mass densities, specific heat, enthalpy, viscosity, thermal conductivity, collision frequency and electrical conductivity as a function of temperature, pressure and different degree of temperature non-equilibrium are computed. Reactional, electronic and heavy particle components of the total thermal conductivity are discussed. To meet practical needs of fluid-dynamic simulations, temperatures included in the computation range from 300 K to 45,000 K, the ratio of electron temperature (T e) to the heavy particle temperature (T h) ranges from 1 to 30 and the pressure ranges from 0.1 to 7 atmospheres. Results obtained for thermodynamic equilibrium (T e = T h) under atmospheric pressure are compared with published results obtained for similar conditions. Observed overall agreement is reasonable. Slight deviations in some properties may be attributed to the values used for collision integral data and for the two temperature formulations used. An approach for computing properties under chemical non-equilibrium and associated deviations from two-temperature results under similar conditions are discussed.

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Acknowledgements

The authors would like to thank Hypertherm Inc. for financial support. One of the authors (S. Ghorui) is thankful to Department of Atomic Energy, India for grant of leave for post-doctoral study.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, 55455, USA

    S. Ghorui, Joachim V. R. Heberlein & E. Pfender

  2. Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    S. Ghorui

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  1. S. Ghorui
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  2. Joachim V. R. Heberlein
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  3. E. Pfender
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Correspondence to S. Ghorui.

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Ghorui, S., Heberlein, J.V.R. & Pfender, E. Thermodynamic and Transport Properties of Two-temperature Oxygen Plasmas. Plasma Chem Plasma Process 27, 267–291 (2007). https://doi.org/10.1007/s11090-007-9053-7

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