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Wall surface reaction, definition issue

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Old   January 16, 2013, 09:23
Default Wall surface reaction, definition issue
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Gerry Boyce
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Hi there,

I was wondering if someone could help me with a problem I am having regarding defining a wall surface reaction UDF. I am trying to model platelet transport in blood and platelet interaction with blood vessel walls. I have defined two platelet species (gas species), Resting Platelets (RP) and Activated Platelets (AP). I have a source term for each of the species and I am trying to define a reactive wall flux term that accounts for platelet deposition on the vessel walls.
In the DEFINE_SR_REACTION macro, I have defined 2 wall surface reactions - reaction-1 for RP flux to the wall and reaction-2 for AP flux to the wall
In the UDF I am returning a reaction rate value in the pointer *rr (kmole/m^2-s)
In the Edit Reactions dialogue box (Problem Setup -> Materials -> mixture-template -> Reactions-Edit) I have set the following parameters:

reaction-1:
Reactant Specie = RP, Stoic. Coeff. = 1, Rate Exponent = 1
Product Specie = RP, Stoic Coeff. = 1, Rate Exponent = 0

reaction-2:
Reactant Specie = AP, Stoic Coeff. = 1, Rate Exponent = 1
Product Specie = AP, Stoic Coeff. = 1, Rate Exponent = 0

When I run the model I see no flux of AP or RP to the wall surface and I'm not quite sure what I'm doing wrong. Any help would be greatly appreciated! Thanks!
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Old   February 22, 2013, 18:59
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Tim Maguire
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Gerry:

Did you end up finding a solution to this problem?
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Old   February 23, 2013, 03:09
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I have modeled so many combustion problems. What is the problem. He may have not written the UDF correct.
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