October 2, 2025Open Access

Master equation study of three-body recombination of nitrogen and oxygen in non-equilibrium hypersonic flows

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Three-body recombination was effectively modeled, indicating significant energy transfer in non-equilibrium settings.
The study calculated effective recombination rate constants during the quasi-steady state period for both N2 and O2 systems.
Using master equations provided insights into the population distribution of energy levels and the two relaxation time scales.
Different relaxation time constants for heating and cooling were observed, highlighting the effects of anharmonicity in expanding flows.

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Analysis reveals energy transfer dynamics in N2 and O2 systems under non-equilibrium conditions, suggesting new modeling approaches.

Notey et al. (2025) studied this question.

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