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Unreacted shrinking core model in Fluent

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Old   March 20, 2010, 01:54
Question Unreacted shrinking core model in Fluent
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Hari Narayanan P
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Hi..
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 ..
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Old   March 27, 2010, 05:26
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Hari Narayanan P
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Can someone suggest something??
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Old   May 10, 2010, 16:07
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Hari Narayanan P
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Hello World,

This is the request from a deprived soul, who has been battling with the above problem from time immemorial. If you have seen it and do not know how to go about, people atleast do give me some hope. Such an insignificant thing has really strangled the happiness out of my life. My girl ditched me and am broke and really depressed. Please please do guide me or atleast put me through to someone who can help me.
Consider this as a life-saving request.


Thanks and regards
Mr. Desperate
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Old   May 11, 2010, 07:23
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Cecilia
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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.
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Old   July 17, 2010, 21:26
Default What is the goal of the analysis?
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Kartik Mahalatkar
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Hi,

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.

Thanks,

Kartik
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