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Modelling of SOEC for H2 Production using Fuel cell and electrolysis module in Fluent

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Old   June 29, 2024, 08:19
Post Modelling of SOEC for H2 Production using Fuel cell and electrolysis module in Fluent
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Sai Kireeti
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Dear Community,

I am currently working on CFD modelling of Solid Oxide Electrolysis Cell (SOEC) using Fuel Cell and Electrolysis Model in Ansys - Fluent. I have finished the geometry and mesh part of the solution domain.

Actually, I am trying to replicate a paper as part of my Master's Thesis (DOI: ).
After putting all the required parameters and the boundary conditions and starting the calculation part, I noticed that instead of h2 being produced, it is getting consumed. I have tried many other possible ways through suggestions from other forum but i could not get the exact result.

I am attaching the report that I got generated from fluent which contain all the conditions and parameters for the simulation.

I kindly request the community to help me in this regard.

In addition I need some clarity on the following quote mentioned in the Ansys theory guide "Note that, conventionally, the negative voltage is supplied to the cathode side in power consuming devices such as electrolyzers. Ansys Fluent adopts the inverse notation where the negative voltage is supplied to the anode side while cathode remains positively charged. The main reason for this discrepancy is that the same infrastructure is used for both the electrolysis and fuel cells models. Usage of the terms "anode" and "cathode" in this manual and in the user interface should be interpreted according to conventions for power-supplying devices."

So, does this mean I have assign the parameters for the fuel electrode of SOEC to Anode and oxygen electrode of SOEC to cathode of Ansys model?
and if i am operating the SOEC at 1.3 V, should I give BC at anode as -1.3 V and cathode to be grounded?

Thanks in Advance,

Regards,
Sai Kireeti,
Gmail: kireeti1729@gmail.com.
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File Type: zip Fluent Report.zip (157.9 KB, 6 views)
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Old   July 1, 2024, 02:49
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Sai Kireeti
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Quote:
Originally Posted by Kireeti View Post
Dear Community,

I am currently working on CFD modelling of Solid Oxide Electrolysis Cell (SOEC) using Fuel Cell and Electrolysis Model in Ansys - Fluent. I have finished the geometry and mesh part of the solution domain.

Actually, I am trying to replicate a paper as part of my Master's Thesis (DOI: ).
After putting all the required parameters and the boundary conditions and starting the calculation part, I noticed that instead of h2 being produced, it is getting consumed. I have tried many other possible ways through suggestions from other forum but i could not get the exact result.

I am attaching the report that I got generated from fluent which contain all the conditions and parameters for the simulation.

I kindly request the community to help me in this regard.

In addition I need some clarity on the following quote mentioned in the Ansys theory guide "Note that, conventionally, the negative voltage is supplied to the cathode side in power consuming devices such as electrolyzers. Ansys Fluent adopts the inverse notation where the negative voltage is supplied to the anode side while cathode remains positively charged. The main reason for this discrepancy is that the same infrastructure is used for both the electrolysis and fuel cells models. Usage of the terms "anode" and "cathode" in this manual and in the user interface should be interpreted according to conventions for power-supplying devices."

So, does this mean I have assign the parameters for the fuel electrode of SOEC to Anode and oxygen electrode of SOEC to cathode of Ansys model?
and if i am operating the SOEC at 1.3 V, should I give BC at anode as -1.3 V and cathode to be grounded?

Thanks in Advance,

Regards,
Sai Kireeti,
Gmail: kireeti1729@gmail.com.
Dear Community,

I was able to resolve the above issue, and it is working fine.

The only issue I am facing now is that my model underpredicts the current density for a given applied voltage by almost 3 times from the reference article (DOI:10.1002/ese3.1255).

I would greatly appreciate your guidance on how I can improve the accuracy of my model.

Thanks in Advance,

Regards,
Sai Kireeti.
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Old   November 18, 2024, 10:28
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Have you been to able to resolve the current density under prediction issue, where your model was predicting values 3 times lower than the reference article?
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Old   November 18, 2024, 12:00
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Originally Posted by bobbyincfdonline View Post
Have you been to able to resolve the current density under prediction issue, where your model was predicting values 3 times lower than the reference article?
Not completely.
Still I am facing the issue though material and Energy balances are satisfied.
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