Unreacted shrinking core model in Fluent
I have to solve the problem of iron ore reduction(i.e reduction of Fe2O3 to Fe3O4, and subsequently to FeO and Fe) using fluent. The following reactions take place
3Fe2O3 + CO ----> 2Fe3O4 + CO2
Fe3O4 + CO ----> 3FeO + CO2
FeO + CO ----> Fe + CO2
Initially there is a solid sphere of Fe2O3 in a stream of CO gas.. It reacts with CO to form a layer of Fe3O4, and in that process Fe2O3 gets consumed.. So an unreacted core of Fe2O3 remains and a layer of Fe3O4 is there over it.. The reaction interface keeps moving radially inside as time progresses.. So CO from surface has to diffuse from surface of solid to the interface between unreacted core and Fe3O4..
How is it possible to model this moving reaction interface in Fluent?
I tried the surface reaction model.. But then as the interface moves inside, both sides of the reaction interface become solids..
I am stuck at this problem for quite sometime... Will be great to get a breakthrough .. :)
Can someone suggest something?? :)
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Maybe I'm wrong, but I would suggest that if it is spherical model, there is only one dimension... There is no need for a geometrical solver as fluent, and no need for a 3D finite volum method. You could solve this problem without fluent, by solving the equations on a 1D model.
What is the goal of the analysis?
We have used FLUENT to model reduction of hematite (Fe2O3) to Wustite (FeO) through a two step reduction mechanism. The goal in our analysis was analyzing the performance of a chemical looping combustion fuel reactor utilizing iron oxide as carrier.
In your case it seems that you are interested in modeling a single particle?
As cecilia pointed out; you can do this using a simple 1-D model. It would be great if you share the objective of your study.
I can also send you some of our as yet unpublished CFD papers in this area. Let me know.
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