Twotemperature interpretation of dissociation rate data for N2 and O2
Abstract
The existing experimental data on dissociation of nitrogen and oxygen obtained using shocktubes during the 1960's and 1970's are reinterpreted using the twotemperature thermochemical model developed recently in order to determine the rate coefficients consistent with the model. In this model, the vibrationalelectronic temperature is calculated by integrating a separate conservation equation accounting for the suppression of vibrational energy during dissociation due to preferential removal of high vibrational states. The rate coefficient is assumed to be a function of the geometricallyaveraged temperature between the translationalrotational temperature and the vibrationalelectronic temperature. By comparing the computed overall and species densities with the experimental data, the rate coefficient values most consistent with the model, and their ranges of uncertainty, are deduced for dissociation of N2 through collisions with N2 or N, and for O2 through collisions with O2, O or N2. It is seen that a single set of such rate coefficients fit all existing experimental data closely. According to the twotemperature model, density and species density are insensitive to the rate coefficients, and so the rate coefficients so determined are uncertain to within a factor of at least 1.5.
 Publication:

26th AIAA Aerospace Sciences Meeting
 Pub Date:
 January 1988
 Bibcode:
 1988aiaa.meetQ....P
 Keywords:

 Gas Dissociation;
 Nitrogen;
 Oxygen;
 Reaction Kinetics;
 Shock Tubes;
 Thermochemistry;
 High Temperature;
 Hypersonic Vehicles;
 Shock Waves;
 Space Shuttles;
 Wave Reflection;
 Atomic and Molecular Physics