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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v1.i1.70
pages 83-95

Chemical Relaxation in Cooling Air Plasmas

E. Epifanie
Centre de Physique Atomique, Unité de Recherche Associée au CNRS n°277 Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
J. Bacri
Centre de Physique Atomique, Unité de Recherche Associée au CNRS n°277 Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
Jean-Philippe Sarrette
Universite de Toulouse; UPS, INPT; LAPLACE (Laboratoire Plasma et Conversion d'Energie), Bat. 3R2, 118 route de Narbonne, F-31062 Toulouse cedex 9, France; CNRS, LAPLACE, F-31062 Toulouse, France
Anne-Marie Gomes
Centre de Physique des Plasmas & de leurs Applications de Toulouse, ESA 5002 du CNRS, Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex4, France

ABSTRACT

To study the relaxation of air plasmas from an initial to a final equilibrium state, a numerical code solving the system of time-dependent coupled rate equations for 13 chemical components including atomic and molecular oxygen negative ions has been developed. The equilibrium plasma compositions have been computed assuming conservation of initial numbers of nuclei (non-constant pressure). About 80 exothermic reactions were considered, the corresponding rate coefficients being taken from the literature. The preliminary results exhibit strong departures from the statistical Saha or Guldberg-Waage equilibria; each plasma component relaxes with a characteristic time.


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