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Foundation ::
Thermal Tools ::
SPECIES
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SPECIES
Evaluating Thermodynamic Properties, Transport Properties & Equilibrium Constants of an 11-Species Air Model
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Moderators:
Adopt This Application!
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SOURCE CODE AVAILABLE
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Accurate numerical prediction of high-temperature, chemically reacting
flowfields requires a knowledge of the physical properties and reaction
kinetics for the species involved in the reacting gas mixture. Assuming an
11-species air model at temperatures below 30,000 degrees Kelvin, SPECIES
(Computer Codes for the Evaluation of Thermodynamic Properties, Transport
Properties, and Equilibrium Constants of an 11-Species Air Model) computes
values for the species thermodynamic and transport properties, diffusion
coefficients and collision cross sections for any combination of the eleven
species, and reaction rates for the twenty reactions normally occurring.
The species represented in the model are
- diatomic nitrogen,
- diatomic oxygen,
- atomic nitrogen,
- atomic oxygen,
- nitric oxide,
- ionized nitric oxide,
- the free electron,
- ionized atomic nitrogen,
- ionized atomic oxygen,
- ionized diatomic nitrogen,
- and ionized diatomic oxygen.
Sixteen subroutines compute the
following properties for both a single species, interaction pair, or
reaction, and an array of all species, pairs, or reactions:
- species specific heat and static enthalpy,
- species viscosity,
- species frozen thermal conductivity,
- diffusion coefficient,
- collision cross section (OMEGA 1,1),
- collision cross section (OMEGA 2,2),
- collision cross section ratio,
- and equilibrium constant.
The program uses least squares polynomial curve-fits
of the most accurate data believed available to provide the requested values
more quickly than is possible with table look-up methods. The subroutines
for computing transport coefficients and collision cross sections use
additional code to correct for any electron pressure when working with ionic
species.
SPECIES carries the NASA case number LAR-14447. It was originally released as part of the NASA COSMIC collection.
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