Non-equilibrium kinetics, diffusion and heat transfer in shock heated flows of N2/N and O2/O mixtures
Abstract
In this paper, the influence of vibrational and dissociation kinetics on heat transfer and diffusion in non-equilibrium flows of N2/N and O2/O mixtures in the relaxation zone behind shock waves is studied on the basis of the state-to-state and one-temperature kinetic theory approaches. The results of calculations of vibrational level populations ni , gas temperature T, total energy flux q, diffusion velocities of molecules at different vibrational states Vi and atoms Va in the relaxation zone behind a shock front are presented for the free stream Mach numbers M = 18, 15, 10. The contribution of different dissipative processes to the total energy flux is evaluated for various flow conditions. Characteristic features of non-equilibrium kinetics, diffusion and energy transfer in two considered mixtures are discussed. The impact of vibrational excitation of N2 and O2 molecules in the free stream on a relaxation zone structure and transport properties behind a shock is shown.
- Publication:
-
Chemical Physics
- Pub Date:
- December 2015
- DOI:
- 10.1016/j.chemphys.2015.10.004
- Bibcode:
- 2015CP....463...70K
- Keywords:
-
- State-resolved transport coefficients;
- State-to-state vibrational kinetics;
- Heat transfer;
- Diffusion;
- Shock waves