NONEQUILIBRIUM VELOCITY DISTRIBUTION OF REACTIVE FOREIGN GAS - SIMULATION AND PHENOMENOLOGY

The velocity distribution function of a homogeneous foreign gas reacti ng with a carrier gas is studied by means of the Monte Carlo simulatio n and it is calculated using an approximate phenomenological approach assuming the Maxwellian form of the distribution with nonequilibrium t emperature. The transition of the system to the hydrodynamic regime is demonstrated. The effect of the chemical reaction on the distribution function is presented in terms of decrease in the second and fourth m oments of the velocity distribution for a wide range of activation ene rgies and ratios of molecular masses. Good agreement between the resul ts of Monte Carlo simulations and the approximate calculations is obse rved.