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Mass Transfer UDF using Fluent VOF

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Old   February 7, 2011, 16:21
Default Mass Transfer UDF using Fluent VOF
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Hello, I am studying the air bubble dynamics from a submerged orifice in pool of aqueous soln of surfactants. As surfactant molecules adsorb and desorb on the moving bubble interface, I need to put a concentration boundary condn on the moving interface. (need to specify a specific concentration function on the bubble interface). As I am using VOF module in Fluent 12, my question is, can I specify a concentration BC on the moving bubble interface? How do I limit my concetration BC equation to region where volume fraction is between 0 to 1? Can I write a UDF for the same?
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Old   February 9, 2011, 22:43
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If your interface is actually defined by the fluid flow (it's arbitrarily deformable), you'll need to write a udf which loops over cells, determines the interface (C_VOF !=0 && C_VOF!=1), and then sets the mass fraction of the surfactants at the interface. While it's a phase interface, it's not really a boundary condition in the Fluent sense.

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Old   February 14, 2011, 16:07
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@Computer Guy

Thank you very much for your reply.
I am still working on it. I might have more questions for you later. :P

But thank you very much for your prompt reply.

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