Validation of the NESSUS probabilistic finite element analysis computer program

Thermal Structures and Materials for High-Speed Flight

“…Also note that Eqs. (18) and (19) are essentially the same, varying only in the slightly different exponent on the Lewis number. This demonstrates that the surface heat transfer is essentially the same whether the flow is in local chemical equilibrium or frozen with a fully catalytic wall.…”

“…In the latter case (frozen flow with a fully catalytic wall), the chemical energy release due to recombination is right at the wall itself. Equations (18) and (19) indicate that the new heat transfer to the surface is essentially the same whether the chemical energy is released within the boundary layer or right at the surface. This trend is graphically illustrated in Fig.29 Recombination rate parameter C, 10 4 Fig.…”

“…Note from Eqs. (18) and (19) that the driving potential for heat transfer is the enthalpy difference (ho e -h w ) in the case of equilibrium flow or frozen flow with a catalytic wall. However, in Eqs.…”

“…Equilibrium boundary layer (spherical nose): (18) where ho = Zi C[ t \Ahfy and U/*/); is the heat of formation of species i at absolute zero.…”

“…However, in Eqs. (18)(19)(20), the enthalpies are absolute values, i.e., they contain the heats of formation, thus including the powerful chemical energy associated with the reacting gas. Also note that Eqs.…”