Fourier and Diffusive Heat Transfer in Hypersonic Nitrogen Flows: State-to-State Approach

Diffusive q_wRec and Fourier q_F components of heat transfer in hypersonic nitrogen flows are discussed. Three models of partially catalytic surfaces differing on the vibrational level(s) pumped by the heterogeneous recombination process are proposed: the ground vibrational state model, the last vibrational state model, and the diffuse vibrational state model. A noncatalytic surface is also considered for comparison. State-to-state gas-phase kinetics is coupled to the state-to-state gas-surface interaction. To investigate the effects of the different surface models and of the gas-phase kinetics, two test cases are considered, taking surface temperature and surface recombination probability as parameters. It is demonstrated that both chemical properties and fluid dynamic properties, such as the surface heat flux, are strongly affected by the state-to-state gas-phase kinetics and the heterogeneous recombination model.