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Article Dans Une Revue Physical Review E Année : 1997

Electron-vibration energy exchange models in nitrogen plasma flows

A. Bourdon

Résumé

This work presents an examination of the validity of the simple linear Landau-Teller-type model proposed by Lee for the electron-vibration energy exchange term in nitrogen ͓in Thermal Design of Aeroassisted Orbital Transfer Vehicles, edited by H. flow conditions encountered in high enthalpy wind tunnels are considered. The time-dependent relaxation of the vibrational energy of nitrogen due to electron inelastic collisions is calculated. The influence of the anharmonicity of the molecule and of the initial vibrational temperature T v is studied. With a harmonic oscillator approximation, it is found that a linear Landau-Teller-type model is accurate to describe the vibra-tional energy relaxation rate for electron temperatures T e in the range 3000 KрT e р20 000 K. When T v ϽT e , our results show that the initial model proposed by Lee overestimates by a mean factor of 3 the electron-vibration (e-V) relaxation time. When T v ϾT e , the relaxation time appears to depend on the initial vibrational distribution. When the anharmonicity of nitrogen is taken into account, generally the relaxation rate of the vibrational energy deviates from a linear rate equation. In this case, it appears much more difficult to model accurately the e-V energy exchange term.
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Dates et versions

hal-02461787 , version 1 (14-07-2020)

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A. Bourdon, P. Vervisch. Electron-vibration energy exchange models in nitrogen plasma flows. Physical Review E , 1997, 55 (4), pp.4634-4641. ⟨10.1103/PhysRevE.55.4634⟩. ⟨hal-02461787⟩
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