12.1.6. Gas phase¶

12.1.6.1. C_PG0¶

Data Type: DOUBLE PRECISION

Specified constant gas specific heat [J/(kg.K) in SI].

12.1.6.2. DABG(SPECIES, SPECIES)¶

Data Type: DOUBLE PRECISION

$1 \leq S p e c i e s \leq 100$
$1 \leq S p e c i e s \leq 100$

Set constant binary diffusion coefficients if known [m^2/s in SI]

12.1.6.3. DIF_COEFF_KT¶

Data Type: LOGICAL

Compute diffusion coefficients from kinetic theory.

Table 12.34 Valid values¶
Name	Default?	Description
`.FALSE.`	◉	Use constant diffusion coefficients. Diffusion data can be obtained from: Taylor, R & Krishna, R, Multicomponent Mass Transfer, Wiley, 1993, p. 134.
`.TRUE.`		Compute diffusion coefficients from kinetic theory. Parameters in Lennard-Jones intermolecular potential model can be obtained from: Table E.1 in Transport Phenomena, by Bird-Stewart-Lightfoot, Wiley, 2002, p. 864. Appendix E: Data. In Liquid-State Physical Chemistry https://doi.org/10.1002/9783527676750.app5 Appendix C in The Properties of Gases and Liquids by Reid-Prausnitz-Sherwood, McGraw-Hill, 1977, p. 678.

12.1.6.4. DIF_G0¶

Data Type: DOUBLE PRECISION

Specified constant gas diffusivity [m^2/s in SI].

12.1.6.5. DIF_THERMAL¶

Data Type: LOGICAL

Include thermal diffusion in multicomponent diffusion model.

Table 12.35 Valid values¶
Name	Default?	Description
`.TRUE.`		Compute thermal diffusion.
`.FALSE.`	◉	Ignore effects of thermal diffusion.

12.1.6.6. HB_GAMA_C¶

Data Type: DOUBLE PRECISION

Strain rate cutoff [1/s] in Herschel-Bulkley viscosity law.

12.1.6.7. HB_K0¶

Data Type: DOUBLE PRECISION

Consistency factor [Pa.s^n] in Herschel-Bulkley viscosity law.

12.1.6.8. HB_N¶

Data Type: DOUBLE PRECISION

Power law index (dimensionless) in Herschel-Bulkley viscosity law.
0 < HB_n < 1 : Shear thinning fluid
HB_n = 1 : Bingham fluid
HB_n > 1 : Shear thickening fluid

12.1.6.9. HB_TAU0¶

Data Type: DOUBLE PRECISION

Bingham yield stress [Pa] in Herschel-Bulkley viscosity law.

12.1.6.10. K_G0¶

Data Type: DOUBLE PRECISION

Specified constant gas conductivity [J/(s.m.K) in SI].

12.1.6.11. LJEPS(SPECIES)¶

Data Type: DOUBLE PRECISION

$1 \leq S p e c i e s \leq 100$

Epsilon/k coefficient in Lennard-Jones potential [in Kelvin].

12.1.6.12. LJSIG(SPECIES)¶

Data Type: DOUBLE PRECISION

$1 \leq S p e c i e s \leq 100$

Sigma coefficient in Lennard-Jones potential [in Angstrom].

12.1.6.13. MU_G0¶

Data Type: DOUBLE PRECISION

Specified constant gas viscosity [Pa.s in SI].

12.1.6.14. MU_G_MODEL¶

Data Type: CHARACTER

Gas viscosity model (default is Sutherland’s law).

Table 12.36 Valid values¶
Name	Default?	Description
`CONSTANT`		Constant viscosity
`SUTHERLAND`	◉	Sutherland’s law
`HERSCHEL-BULKLEY`		Herschel-Bulkley (non-Newtonian) model
`UDF`		User-defined function

12.1.6.15. MULTI_COMPONENT_DIFFUSION¶

Data Type: LOGICAL

Solve the multicomponent diffusion model.

Table 12.37 Valid values¶
Name	Default?	Description
`.TRUE.`		Include multicomponent diffusion model in species equation.
`.FALSE.`	◉	Do not include multicomponent diffusion model.

12.1.6.16. MW_AVG¶

Data Type: DOUBLE PRECISION

Average molecular weight of gas [kg/kmol in SI]. Used in calculating the gas density for non-reacting flows when the gas composition is not defined.

12.1.6.17. MW_G(SPECIES)¶

Data Type: DOUBLE PRECISION

$1 \leq S p e c i e s \leq 100$

Molecular weight of gas species [kg/kmol in SI].

12.1.6.18. NMAX_G¶

Data Type: INTEGER

Number of species comprising the gas phase.

12.1.6.19. RO_G0¶

Data Type: DOUBLE PRECISION

Specified constant gas density [kg/m^3 in SI]. An equation of state, the ideal gas law by default, is used to calculate the gas density if this parameter is undefined. The value may be set to zero to make the drag zero and to simulate granular flow in a vacuum. For this case, users may turn off solving for gas momentum equations to accelerate convergence.

12.1.6.20. SL_MUREF¶

Data Type: DOUBLE PRECISION

Reference gas viscosity [Pa.s in SI] in the Sutherland’s law.

12.1.6.21. SL_S¶

Data Type: DOUBLE PRECISION

Sutherland constant [K] in the Sutherland’s law.

12.1.6.22. SL_TREF¶

Data Type: DOUBLE PRECISION

Reference temperature [K] in the Sutherland’s law.

12.1.6.23. SPECIES_ALIAS_G(SPECIES)¶

Data Type: CHARACTER

$1 \leq S p e c i e s \leq 100$

User defined name for gas phase species. Aliases are used in specifying chemical equations and must be unique.

12.1.6.24. SPECIES_G(SPECIES)¶

Data Type: CHARACTER

$1 \leq S p e c i e s \leq 100$

Name of gas phase species as it appears in the materials database.