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23.9.5 Modeling Multiphase Species Transport

FLUENT lets you describe a multiphase species transport and volumetric reaction (Section  23.8) in a fashion that is similar to setting up a single-phase chemical reaction using the Species Model panel (e.g., Figure  23.9.3).

Define $\rightarrow$ Models $\rightarrow$ Species $\rightarrow$ Transport & Reaction...

Figure 23.9.3: The Species Model Panel with a Multiphase Model Enabled
figure

1.   Select Species Transport under Model.

2.   Turn on Volumetric under Reactions.

3.   Select a specific phase using the Phase drop-down list under Phase Properties.

4.   Click the Set... button to display the Phase Properties panel (Figure  23.9.4).

Figure 23.9.4: The Phase Properties Panel
figure

In the Phase Properties panel, the material for each phase is listed in the Material drop-down list. From this list, you can choose the material that you want to use for a specific phase. The drop-down list contains all of the materials that have been defined for your simulation. If you want to inspect or edit any of the properties of any of the materials, then you need to open the Materials panel by clicking the Edit... button.

5.   In the Species Model panel, choose the Turbulence-Chemistry Interaction model. Three models are available:

Laminar Finite-Rate   computes only the Arrhenius rate (see Equation  14.1-8) and neglects turbulence-chemistry interaction.

Eddy-Dissipation   (for turbulent flows) computes only the mixing rate (see Equations  14.1-26 and 14.1-27).

Finite-Rate/Eddy-Dissipation   (for turbulent flows) computes both the Arrhenius rate and the mixing rate and uses the smaller of the two.

When modeling multiphase species transport, additional inputs may also be required depending on your modeling needs. See, for example, Section  23.9.6 for more information defining heterogeneous reactions, or Section  23.9.7 for more information on mass transfer effects.


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