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Titolo:
CHEMICAL RATE CONSTANTS IN NONEQUILIBRIUM FLOWS
Autore:
BELOUAGGADIA N; BRUN R;
Indirizzi:
UNIV AIX MARSEILLE 1,INST UNIV SYST THERM IND,DEPT MILIEUX HORS EQUILIBRE F-13453 MARSEILLE 13 FRANCE
Titolo Testata:
Journal of thermophysics and heat transfer
fascicolo: 4, volume: 12, anno: 1998,
pagine: 482 - 488
SICI:
0887-8722(1998)12:4<482:CRCINF>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISSOCIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
N. Belouaggadia e R. Brun, "CHEMICAL RATE CONSTANTS IN NONEQUILIBRIUM FLOWS", Journal of thermophysics and heat transfer, 12(4), 1998, pp. 482-488

Abstract

A new method of determination of dissociation and recombination rate constants in a vibrationally nonequilibrium diatomic gas is proposed. This method is based on a hierarchy of characteristic times of elementary collisional processes including translation-rotation-vibration exchanges and chemical transformations. The corresponding Boltzmann equations are solved by a generalized Chapman-Enskog technique. Among the considered situations, the case of a relatively weak vibrational nonequilibrium combined with an arbitrary (equilibrium or nonequilibrium) chemical regime may be treated completely, and explicit relations for the rate constants and vibration energy removed in dissociation may be obtained. These results are then generalized to any type of regime, excluding, however, very strong gradient zones. Examples of the computation of rate constants are presented for various flows: Behind strong shock waves, in supersonic expansion, and in a shock-tube end-wall boundary layer. These example cases all exhibit a non-Arrhenius behavior ofrate constants. For the strong shock case, the calculated values of dissociation rates are compared to results obtained from other models.

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Documento generato il 21/01/21 alle ore 02:22:41