RT Journal Article
ID 6dfd318143a1ed05
A1 Kuznetsov, M. M.
A1 Kuleshova, Yu. D.
T1 INCREASE IN RATES OF KINETIC PROCESSES INSIDE THE BIMODAL HYPERSONIC SHOCK WAVE
JF Heat Transfer Research
JO HTR
YR 2012
FD 2012-05-11
VO 43
IS 3
SP 228
OP 236
K1 kinetics
K1 equation
K1 nonequilibrium
K1 chemical reaction
K1 shock wave
K1 distribution
K1 molecular
AB The problem on the influence of nonequilibrium (non-Maxwell) translational energy distributions over freedom degrees of molecules upon the velocity of inelastic binary collisions with activation threhold energy in the hypersonic shock wave is considered. The method is based on the bimodal Tamm−Mott−Smith approximation of the distribution function of molecules as applied to the analysis of rates of barrier chemical processes. Based on this model the expressions are obtained in explicit form for the distribution function of molecule pairs and frequencies of inelastic binary collisions with energy threshold that allow for the effect of translational nonequilibrium in the hypersonic shock wave. These expressions take into account the anisotropy of a temperature field in the hypersonic shock wave. This fact is of importance for a physical experiment where in the course of numerical calculations the influence of the temperature anisotropy on chemical reaction constants was only estimated. It is shown that in one-component, polyatomic gases with inelastic collisions in the high-velocity "tail" of the bimodal Tamm−Mott−Smith distribution function of molecule pairs, earlier known as the "overlapping" effect, i.e., the excess of the number Nneq of high-velocity pairs inside the wave front over the number Neq in the translational equilibrium zone behind the front, has a maximum in the relative quantity Nneq /Neq