DPM - Solid reaction
I'm trying to simulate a solid reaction inside an ash particle.
Therefore I am using the Discrete Phase Model (DPM).
Nothing special so far, DPM works fine.
Let's consider this:
I want to apply the DPM on a converged simulation of a power plant.
So I am using the DPM without interaction with the continuous phase.
All variables inside the domain are solved, therefore I have the whole zoo of species concentrations at hand.
The most important species to me is oxygen. Why?
Because I want to simulate this reaction:
Fe and FeO are part of the mineral ash inside the particle.
So I am tempted to define the volume fraction of my particle with two User Defined Scalar:
Typical laws for the propagation of such species are
where and corresponds to the volume fraction of the species and time. is some coefficient.
Now there is my problem:
The species volume fraction inside the particle are 1 for and 0 for .
The application of these numbers to the above law will lead to zero reaction (because 1 - X = 1 - 1 = 0). This can't be right.
The obvious reason? Oxygen!
I think I need to include the oxygen into my considerations.
The reaction will only take place in an oxygen environment.
Remember: The oxygen is part of the allready calculated solution inside the domain.
What I am not sure about is the connection between my definition on the particle itself (the User Defined Scalars) and the oxygen concentration in the domain.
The volume -concentration of the system containing my particle and oxygen will be less than 1 ...
I'm not sure how to approach this.
How can I tell if stoichiometric conditions apply?
(How do I identify the conditions at all?!)
What happens if there is less/more oxygen than needed?
Hope I made myself clear.
Feel free to answer. Any help is appreciated.
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