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Transport of concentrated species, Membrane gas separation
Posted Apr 12, 2013, 8:07 a.m. EDT 9 Replies
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The problem is with mass balance in this scheme - see Line Graphs. As a result it gives mass/mole fractions higher than 1 or lower than 0. Likely I don't get some sense of using Transport of concentrated species interface.
How can I make all of the components passing the membrane? As I'm choosing 3 components, I can define flux only for 2.
What happens on the feed side when part of the component is leaving by the wall? I think the pressure should decrease along the wall (according to decreasing of component partial pressure and friction influence on fluid flow), also mass flux decreases. Does Comsol "knows" that?
Are the Laminar flow and Transport of concentrated species interfaces sufficient to create property model in this case?
I wish you know the answers ;-)
I'm beginner - I'm sure you've guessed.
Anna
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I have faced the same problem you have. I got around it by adding an extra inert species (water in my case) which does not cross the membrane. You can then choose to solve the mass fraction of your inert species with the mass constraint and you can flux all the other species across the membrane.
Sri.
P.S.: I am a beginner too.
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However, I'm gonna ask for help some Comsol expert (still looking for somebody), because I don't feel like I can manage it only by myself.
I have a problem with a mass balance when using Transport of concentrated species, probably other conditions need to be defined...
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www.comsol.com/support/knowledgebase/1100/
The problem is I can not open the file. If anyone can convert it to 4.3 or 4.3a version file, please do upload.
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I manage to open it in 4.3a, but I had to load it twice from the KB page ? check that it's really 397 kB big
Else ask support to translate it, they will also check that its compliant ;)
--
Good luck
Ivar
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Thank U very much!
I have just found very interesting explanation how to use Transport of Concentrated Species physics when coupled with Laminar Flow. The article clarifies a lot for me.
www.comsol.com/support/knowledgebase/1100/
The problem is I can not open the file. If anyone can convert it to 4.3 or 4.3a version file, please do upload.
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I am establishing a model using laminar flow with concentrated species, and there is always a caculation error. Have you got the useful file to instruct you?i am appreciate it if you can upload it. thanks in advance.
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actually i m working on the same model as you...if in this time u were able to develop the model...can u just send it to me....actually m a beginner and your last upload was of great help to understand the basics.
i will be really thankful to you if u could hep me with this.
p.s. i dont know if this thread is still valid
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Hi
I manage to open it in 4.3a, but I had to load it twice from the KB page ? check that it's really 397 kB big
Else ask support to translate it, they will also check that its compliant ;)
--
Good luck
Ivar
Hi Ivar,
the link shared cannot be found again. do u store this model and if so, would you please upload it? I appreciate it so much!
best regards,
Yuhong