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[Kim Seokgyeom]

Hi. I'm Kim

I'm simulating scr catalyst reaction. So I used species transport wall surface reaction. And also shape of scr corrugated catalyst is so small compared to duct, so I applied the porous media to replace catalyst.

Then after applying porous media, the chemical reaction only reacts to the surfase area[1/m] not with boundary conditions like temperature. And also product doesn't change according to arrhenius equation constant(A, Ea) but only surface area too.

My reaction fomula is 

NH3 + V5+-OH > V-ONH4

Arrhenius equation constant

- A=8e+6, Ea=20000000, b=0

Can anyone tell me to apply porous media to wall surface reaction?

[Supreetha J]

Hello,

 

For detailed information, kindly refer to "Enabling Reactions in a Porous Zone" section uder Porous Media Conditions in the Ansys User's Guide https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/flu_ug/flu_ug_bcs_sec_cell_zones.html%23flu_ug_sec_bc_porous_media

 

If you are not able to access the link, please refer to this forum discussion: https://forum.ansys.com/forums/topic/how-to-access-the-ansys-online-help/

 

To incorporate the Arrhenius equation constants into the porous media model, you can define a reaction rate expression using UDF and use this in the wall surface reaction model.

 

I hope this helps.

[Kim Seokgyeom]

Thank you for kind reply :)

As you told me I refer to Ansys User’s Guide. At there I found the way to set the options for species transport. Then I could’t find how to use UDF for incorporating the Arrhenius equation constants into the porous media model. I had never used UDF before. So can you tell me how to use UDF or Guide?

 

[Supreetha J]

Kindly refer to Customization in Ansys Fluent | Ansys Innovation Courses

Thank you.