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• W1673485705 abstract "When the sheath thickness for the weakly ionized gas of a chemically nonequiltbrium boundary layer over a hypersonic re-entry vehicle is of the same order as the boundary-layer thickness, the ion and electron densities can no longer be considered as identical and treated as ambipolar. It is shown that this situation will prevail in certain re-entry regimes of interest. In the present paper, this important behavior has been considered in the analysis and a correct description of the ion and electron distributions is obtained. It is found that the electric field exerts a strong influence on the ion and electron density distributions. In particular, the peak electron density is modified by more than an order of magnitude as compared to that of ambipolar case. The ion density due to its strong coupling with the neutrals, however, is much less affected. Investigations also show only slight changes in the ion and electron density distributions for relatively large variations (100%) in ion diffusion coefficient. The effect of nonequilibriu m electron temperature was found to be moderate on the electron density distribution and justifies, at least a posteriori, the simplifications adapted for the analysis in the energy conservation relations. Nomenclature A = modifying factor for polarization C — mass fractions do = peak mass fraction of ion D = diffusion coefficient !ID — Debye length, m Rm = mass ratio of ion to electron K = mobility k = Boltzmann constant kb = backward rate constant, cm3/mole-sec kf = forward rate constant, cm3/mole-sec L = characteristic length, m M = molecular weights p = pressure, kgf/m2 T = temperature, °K u = £ component of the mass velocity of the gas mixture v = 77 component of the mass velocity of the gas mixture W = mass rate of formation of species d = boundary-layer thickness 8t = transformed boundary-layer thickness p = density 0 = electric potential X = mean free path, m £ = X/L, streamwise coordinate •n = T I P/Pidy Subscripts" @default.
• W1673485705 created "2016-06-24" @default.
• W1673485705 creator A5080531404 @default.
• W1673485705 date "1969-04-01" @default.
• W1673485705 modified "2023-10-09" @default.
• W1673485705 title "Electron and ion distributions in chemical nonequilibrium boundary-layer flows." @default.
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• W1673485705 doi "https://doi.org/10.2514/3.5176" @default.
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