Dissociation rate constants of diatomic molecules under thermal equilibrium conditions

Ibragimova, L. B.; Smekhov, G. D.; Shatalov, O. P.

doi:10.1007/bf02698767

Cited by 34 publications

(10 citation statements)

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“…The nonequilibrium dissociation rate constants (T v = T 2 ) were obtained for several high-temperature regimes T 0 = 10,820, 10,400, 9,400, and 8,620 K. Uncertainty of rate constant was evaluated using scatter of measured data: -lg k d = ±0.15. As can be seen from the ¦gure, the values of thermal nonequilibrium dissociation rate constants k d determined in this study are less than data of [4] (curve 1) and much less than [5] (curve 2). The equilibrium values k d obtained for the regimes with T 0 = 9,400, 8,620, and 6,470 K coincide with curve 2 corresponding to the equilibrium values of k 0 d (T = T v ) recommended in [5].…”

Section: Progress In Flight Physicscontrasting

confidence: 57%

“…As can be seen from the ¦gure, the values of thermal nonequilibrium dissociation rate constants k d determined in this study are less than data of [4] (curve 1) and much less than [5] (curve 2). The equilibrium values k d obtained for the regimes with T 0 = 9,400, 8,620, and 6,470 K coincide with curve 2 corresponding to the equilibrium values of k 0 d (T = T v ) recommended in [5]. For dissociation degrees α > 5%, the processing of experimental data gives at the same temperature the bigger values of k d than at α < 5% owing to accelerating in §uence of oxygen atoms on the dissociation process.…”

Section: Progress In Flight Physicscontrasting

confidence: 57%

“…and empty signs to Tv = T2: 1 ¡ data [4]; 2 ¡ k d recommended in [5] for conditions Tv = T ; and 3 ¡ modeling…”

Section: Progress In Flight Physicsmentioning

confidence: 99%

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Experimental study of nonequilibrium dissociation of molecular oxygen

Bykova

Ibraguimova

Shatalov

et al. 2013

Progress in Flight Physics

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The quantitative experimental data on the evolution of gas temperature (T ) and vibrational temperature (T v ) of molecular oxygen behind the strong shock wave front (T = 4,000 10,800 K) were used for determination of oxygen vibrational relaxation time and dissociation rate constants under thermal nonequilibrium conditions. Some of theoretical models of thermal nonequilibrium dissociation were tested using the measured pro¦les of the T v and T .

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Section: Progress In Flight Physicscontrasting

confidence: 57%

Section: Progress In Flight Physicscontrasting

confidence: 57%

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Experimental study of nonequilibrium dissociation of molecular oxygen

Bykova

Ibraguimova

Shatalov

et al. 2013

Progress in Flight Physics

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“…Vibrational non-equilibrium of CO 2 molecules also leads to the increase of the surface heat flux up to 10%. The results were obtained using three models for thermal equilibrium reaction rates [29,[30][31][32]. While only the slight influence of chemical reaction model on the heat transfer to the non-catalytic surface was found, near the fully catalytic surface this effect occurs more essential [15].…”

Section: Resultsmentioning

confidence: 99%

Vibrational-Chemical Kinetics in Mars Entry Problems

Kustova¹,

Нагнибеда²,

Armenise³

2014

TOPPJ

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The paper deals with kinetic theory methods modelling of reacting gas flows near spacecrafts entering the Mars atmosphere. For mixtures containing CO 2 molecules, the complete kinetic scheme including all vibrational energy transitions, dissociation, recombination and exchange chemical reactions is proposed. For the prediction of gas dynamic parameters and heat transfer to the surface of a spacecraft, a detailed approach taking into account state-to-state CO 2 vibrational and chemical kinetics as well as multi-temperature approaches based on quasi-stationary vibrational distributions are used. A more accurate but complicated and time consuming state-to-state model is applied for the numerical simulation of a one-dimensional flow in a boundary layer near the entering body surface. More simple quasistationary three-temperature, two-temperature and one-temperature approaches are used for the numerical study of a 2-D viscous shock layer under entry conditions. The vibrational distributions near the surface are far from the local vibrational and chemical equilibrium and a noticeable difference is found between the values of CO 2 vibrational-specific energies at the surface obtained by means of the state-to-state and quasi-stationary approaches. At the same time, for all considered approaches, the kinetic model for vibrational distributions and chemical reactions has a weak influence on the heat transfer to the non-catalytic vehicle surface.

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“…The reaction rates for the two models are obtained from: 1. KSS model based on Shatalov's expression for one-temperature rate constant and reaction rate data of [9]. 2.…”

Section: Dsmc Chemistry Modelsmentioning

confidence: 99%