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32.3.10 Define/Models/Species/SOx...

The Define/Models/Species/SOx... menu item opens the SOx Model panel.



SOx Model Panel


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Controls
Model   contains the control to enable the model.

SOx Formation   enables the model.

Turbulence Interaction   contains parameters related to the effect of turbulent fluctuations on the NOx formation. See Section  20.2.7 for details.

PDF Mode   is a drop-down list containing options that take into account turbulent fluctuations when you compute the specified SO $_2$ formation. See Section  20.1.10 for details.

temperature   includes fluctuations of temperature.

temperature/species   includes fluctuations of temperature and mass fraction of the species selected in the Species drop-down list (which appears when you select this option).

Mixture Fraction   includes fluctuation in the mixture fraction(s). This is available for non-premixed combustion calculations only.

Beta PDF Points   controls the number of points at which the beta function in Equation  20.1-104 or Equation  20.1-105 will be integrated. The default value of 10, which indicates that the beta function will be integrated at 10 points on a histogram basis, will yield an accurate solution with reasonable computation time. Increasing this value may improve accuracy, but will also increase the computation time. (This item will appear only if you have selected one of the four PDF modes for turbulence interaction.)

User-Defined Functions   contains controls for selecting an SOx Rate UDF. See the separate UDF Manual for details.
Sox Rate   drop-down list consists of the UDFs that can be selected.

Replace with UDF Rate   replaces any or all of FLUENT's SOx rate calculations with your own user-defined SOx rate.

Formation Model Parameters   contains the parameters associated with the selected
SOx model.

Fuel Type   enables selection of the fuel.

Solid   enables the calculation of solid fuel SOx.

Liquid   enables the calculation of liquid fuel SOx.

Gas   enables the calculation of gas fuel SOx.

Include SO3 Product   includes SO3 as a product as described in Section  20.2.3.

Include SH and SO Intermediaries   includes SH and SO as intermediates as described in Section  20.2.3.

S Intermediate   drop-down list enables you to select intermediate species ( h2s, so2, or h2s/so2).

Volatile S Mass Fraction   specifies the mass fraction of sulfur in the volatiles. This parameter appears only for Solid fuel SOx calculations.

Fuel S Mass Fraction   field sets the value for correct mass fraction of sulfur in the fuel (kg sulfur per kg fuel). This parameter appears only for Liquid and Gas fuel SOx calculations.

Conversion Fraction   specifies the overall fraction of the fuel S, by mass, that will be converted to the intermediate species and/or product SO $_2$. The S Intermediate Conversion Fraction has a default value of 1.

Partition Fractions   sets the fraction of the converted fuel S, by mass, that will become h2s. This control is activated only if you select h2s/so2 as S Intermediate.

Note:   The fraction of fuel S that will become SO $_2$ will be calculated by the remainder. Setting a partition fraction of 0 for H $_2$S is equivalent to assuming that all fuel S is converted to the final product SO $_2$.

Char S Conversion   drop-down list selects the char S conversion path as so2, h2s, or so2/h2s. This parameter appears only for Solid fuel SOx calculations.

Char S Mass Fraction   specifies the mass fraction of sulfur in the char. This parameter appears only for Solid fuel SOx calculations.

Conversion Fraction   specifies the overall fraction of the char S, by mass, that will be converted to the intermediate species and/or product SO $_2$. This parameter appears only for Solid fuel SOx calculations.

Partition Fractions   specifies the fraction of the converted char S, by mass, that will become SO2. This parameter appears only when you select so2/h2s from the Char S Conversion drop-down list. This parameter appears only for Solid fuel SOx calculations.

[O] Model   drop-down list specifies the method by which O will be calculated, i.e., equilibrium, partial-equilibrium, or instantaneous in the [O] Model

[OH] Model   drop-down list specifies the method by which OH will be calculated, i.e., equilibrium, partial-equilibrium, or instantaneous in the [OH] Model

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To use the predicted O and/or OH concentration, select instantaneous in the [O] Model or [OH] Model drop-down list.


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