The
Define/Models/Species/SOx... menu item opens the
SOx Model panel.
SOx Model Panel
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
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
. The
S IntermediateConversion 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
will be calculated by the remainder. Setting a partition fraction of 0 for H
S is equivalent to assuming that all fuel S is converted to the final product SO
.
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
. 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
To use the predicted O and/or OH concentration, select
instantaneous in the
[O] Model or
[OH] Model drop-down list.