12.1.7. Gas Phase

12.1.7.1. 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.

12.1.7.2. MU_G_MODEL

Data Type: CHARACTER

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

Table 12.56 Valid Values

Name

Default?

Description

CONSTANT

Constant viscosity

SUTHERLAND

Sutherland’s law

HERSCHEL-BULKLEY

Herschel-Bulkley (non-Newtonian) model

UDF

User-defined function

12.1.7.3. MU_G0

Data Type: DOUBLE PRECISION

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

12.1.7.4. SL_MUREF

Data Type: DOUBLE PRECISION

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

12.1.7.5. SL_TREF

Data Type: DOUBLE PRECISION

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

12.1.7.6. SL_S

Data Type: DOUBLE PRECISION

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

12.1.7.7. HB_TAU0

Data Type: DOUBLE PRECISION

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

12.1.7.8. HB_K0

Data Type: DOUBLE PRECISION

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

12.1.7.9. 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

12.1.7.10. HB_GAMA_C

Data Type: DOUBLE PRECISION

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

12.1.7.11. K_G0

Data Type: DOUBLE PRECISION

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

12.1.7.12. C_PG0

Data Type: DOUBLE PRECISION

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

12.1.7.13. DIF_G0

Data Type: DOUBLE PRECISION

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

12.1.7.14. 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.

12.1.7.15. MW_G(SPECIES)

Data Type: DOUBLE PRECISION

  • \(1 \le Species \le 100\)

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

12.1.7.16. NMAX_G

Data Type: INTEGER

Number of species comprising the gas phase.

12.1.7.17. SPECIES_G(SPECIES)

Data Type: CHARACTER

  • \(1 \le Species \le 100\)

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

12.1.7.18. SPECIES_ALIAS_G(SPECIES)

Data Type: CHARACTER

  • \(1 \le Species \le 100\)

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