Gas Dynamic Equations, Transport Coefficients, and Effects in Nonequilibrium Diatomic Gas Flows

The problem of redistribution of translational and rotational energy has been solved for diatomic gases within the framework of the Chapman ‐Enskog method and the Parker model in the general case of the arbitrary energy exchange ratio. The nonequilibrium gasdynamic equations, transport coefe cients, and relaxation time have been foundforrotational-translationalprocessesinadiatomicgas.Thecalculationsofrelaxationtime,viscosity,thermal conductivity, and diffusion coefe cients are carried out in thetemperature range from 200 to 10,000 K for nitrogen. The calculated parameters and coefe cients are compared with the values obtained by the Mason ‐Monchick approximatemethodaswellasdatafromexperimentsinultrasonic,shock-wave,and vacuumdevices.Thecorrelation of the theoretical and experimental data is satisfactory. The applicability of one- and two-temperature relaxation models is discussed. The numerical solutions of the obtained system of the Navier ‐Stokes equations are analyzed for the cases of spherical expanding nitrogen e ow and supersonic raree ed gas e ow near a sphere.

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