Transport properties of five-component nitrogen and oxygen ionized mixtures with electronic excitation

Истомин, В. А.; Кустова, Е. В.

doi:10.1063/1.4769496

Cited by 6 publications

(8 citation statements)

References 3 publications

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“…20 for singlecomponent electronically excited gases and extended later for non-equilibrium mixtures of neutral and ionized gases. 24 The model is based on the modification of the Chapman-Enskog method for flows with rapid and slow collisional processes. 25 For the present case, the zero-order distribution function is the combination of local equilibrium Maxwell and Boltzmann distributions over velocity and internal energy whereas chemical composition is found from the equations of strongly nonequilibrium chemical kinetics.…”

Section: A Kinetic Theory Approachmentioning

confidence: 99%

Eucken correction in high-temperature gases with electronic excitation

Истомин

Кустова

Mekhonoshina

2014

The Journal of Chemical Physics

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A high-order numerical method to study hypersonic boundary-layer instability including high-temperature gas effects Phys. Fluids 23, 084108 (2011) In the present paper, thermal conductivity coefficient of high-temperature molecular and atomic gases with excited electronic states is studied using both the kinetic theory algorithm developed by authors earlier and the well known simple expression for the thermal conductivity coefficient proposed by Eucken and generalized by Hirschfelder. The influence of large collision diameters of excited states on the thermal conductivity is discussed. The limit of validity of the Eucken correction is evaluated on the basis of the kinetic theory calculations; an improved model suitable for air species under high-temperature conditions is proposed. © 2014 AIP Publishing LLC.

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Section: A Kinetic Theory Approachmentioning

confidence: 99%

Eucken correction in high-temperature gases with electronic excitation

Истомин

Кустова

Mekhonoshina

2014

The Journal of Chemical Physics

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“…This gap in the transport kinetic theory starts to filling out during the last quarter-century. Algorithms for the calculation of transport coefficients in chemically equilibrium plasmas and one-temperature non-equilibrium partially ionized gases were proposed [3][4][5][6][7][8][9][10][11]. It was shown that in high-temperature flows, neglecting electronically excited species yields considerably under-predicted convective heat flux.…”

Section: Introductionmentioning

confidence: 99%

“…The objective of the present study is to generalize our previous one-temperature models of high-temperature reacting flows with electronic excitation [10,[12][13][14][15] by including state-to-state kinetics of electronic levels and state-dependent transport coefficients. While the state-to-state model has been widely used in simulations of vibrationally excited flows (see references in [16,11]), its implementation for gases with electronic excitation is just starting [17,18,11,19,20].…”

Section: Introductionmentioning

confidence: 99%

State-specific transport properties of partially ionized flows of electronically excited atomic gases

Истомин

Кустова

2017

Chemical Physics

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a b s t r a c tState-to-state approach for theoretical study of transport properties in atomic gases with excited electronic degrees of freedom of both neutral and ionized species is developed. The dependence of atomic radius on the electronic configuration of excited atoms is taken into account in the transport algorithm. Different cutoff criteria for increasing atomic radius are discussed and the limits of applicability for these criteria are evaluated. The validity of a Slater-like model for the calculation of state-resolved transport coefficients in neutral and ionized atomic gases is shown. For ionized flows, a method of evaluation for effective cross-sections of resonant charge-transfer collisions is suggested. Accurate kinetic theory algorithms for modelling the state-specific transport properties are applied for the prediction of transport coefficients in shock heated flows. Based on the numerical observations, different distributions over electronic states behind the shock front are considered. For the Boltzmann-like distributions at temperatures greater than 14,000 K, an important effect of electronic excitation on the partial thermal conductivity and viscosity coefficients is found for both neutral and ionized atomic gases: increasing radius of excited atoms causes a strong decrease in these transport coefficients. Similarly, the presence of electronically excited states with increased atomic radii leads to reduced diffusion coefficients. Nevertheless the overall impact of increasing effective cross-sections on the transport properties just behind the shock front under hypersonic reentry conditions is found to be minor since the populations of high-lying electronic energy levels behind the shock waves are low.

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“…Growing interest to theoretical studies of high-temperature reacting flows with excited electronic degrees of freedom is connected to problems of spacecraft (re)entry to planetary atmospheres and design of thermal protection systems. In recent works [1,2,3,4,5,6,7] it was shown that internal thermal conductivity coefficient associated to electronically excited states may considerably exceed that of translational modes, and the most significant contribution to the total thermal conductivity of high-temperature mixtures is given by electronically excited atomic species. Preliminary results on the heat transfer in a shock heated ionized nitrogen mixture were reported in [6].…”

Section: Introductionmentioning

confidence: 99%

“…The collision integrals are taken from [2]. In our previous papers [5,6] we analyzed the heat conductivity of neutral and ionized species under hightemperature conditions. It was shown that for ionized atomic species, electronic excitation plays the most important role in the temperature range 25000-50000 K, where the total thermal conductivity coefficient exceeds substantially the translational one.…”

Section: Introductionmentioning

confidence: 99%