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23.9.6 Specifying Heterogeneous Reactions

You can use FLUENT to define multiple heterogeneous reactions and stoichiometry using the Phase Interaction panel (e.g., Figure  23.9.5).

Define $\rightarrow$ Phases...

1.   In the Phases panel (Figure  23.9.2), click the Interaction... button to open the Phase Interaction panel.

Figure 23.9.5: The Phase Interaction Panel for Heterogeneous Reactions

2.   Click the Reactions tab in the Phase Interaction panel.

3.   Set the total number of reactions (volumetric reactions, wall surface reactions, and particle surface reactions) in the Total Number of Heterogeneous Reactions field. (Use the arrows to change the value, or type in the value and press <Enter>.)

4.   Specify the Reaction Name of each reaction that you want to define.

5.   Set the ID of each reaction you want to define. (Again, if you type in the value be sure to press <Enter>.)

6.   For each reaction, specify how many reactants and products are involved in the reaction by increasing the value of the Number of Reactants and the Number of Products. Select each reactant or product in the Reaction tab and then set its stoichiometric coefficient in the Stoich. Coefficient field. (The stoichiometric coefficient is the constant $\nu'_{i,r}$ or $\nu''_{i,r}$ in Equation  14.1-6.)

7.   For each reaction, indicate the Phase and Species and the stoichiometric coefficient for each of your reactants and products.

8.   For each reaction, indicate an applicable user-defined function using the Reaction Rate Function drop-down list.


The heterogeneous reaction rates can only be specified using a user-defined function. A UDF is available for an Arrhenius-type reaction with rate exponents that are equivalent to the stoichiometric coefficients.

For more information, see the separate UDF Manual.


FLUENT assumes that the reactants are mixed thoroughly before reacting together, thus the heat and momentum transfer is based on this assumption. This assumption can be deactivated using a text command. For more information, contact your FLUENT support engineer.

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