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No-homogeneous initial condition

Posted 3 déc. 2014, 22:26 UTC−5 Chemical Reaction Engineering Version 5.0 6 Replies

Ximena Paz Barrios Pizarro
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Hello
I am trying to build a mass transport model that has a higher solute concentration in a region than in other of the same domain.
Is this possible in COMSOL? How?
6 Replies Last Post 12 déc. 2014, 08:25 UTC−5
Lasse Murtomäki
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Posted: 10 years ago 4 déc. 2014, 04:47 UTC−5
Hi

It is possible. Either you use a function to define an initial distribution or split your domain into smaller ones having varying initial concentrations. No boundary conditions are needed at the internal boundaries.

br
Lasse
Hi It is possible. Either you use a function to define an initial distribution or split your domain into smaller ones having varying initial concentrations. No boundary conditions are needed at the internal boundaries. br Lasse
Ximena Paz Barrios Pizarro
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Posted: 10 years ago 4 déc. 2014, 12:08 UTC−5
Hi

And how can I do that?
I am a new COMSOL user, so I will be very thankful if you told me how to do that.

Hi And how can I do that? I am a new COMSOL user, so I will be very thankful if you told me how to do that.
Lasse Murtomäki
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Posted: 10 years ago 5 déc. 2014, 04:38 UTC−5
Please tell me what you wish to do. I can try.
Please tell me what you wish to do. I can try.
Ximena Paz Barrios Pizarro
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Posted: 10 years ago 6 déc. 2014, 12:54 UTC−5
Hello

My system consists in a membrane that is charged with a solute, but it is not homogeneous. The solute concentration is higher near to the surface than inside the membrane.
So, I built a 1D model and I want changes in concentration along the interval. Maybe, a linear way could be useful.

Thank you!
Hello My system consists in a membrane that is charged with a solute, but it is not homogeneous. The solute concentration is higher near to the surface than inside the membrane. So, I built a 1D model and I want changes in concentration along the interval. Maybe, a linear way could be useful. Thank you!
Lasse Murtomäki
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Posted: 10 years ago 8 déc. 2014, 04:34 UTC−5
Hi

Let's say that you membrane has a thickness H and the maximum concentration in the membrane is Cmax, and minimum concentration is Cmin. If you wish, e.g. a parabolic distribution in the membrane, make an initial concentration

4*(Cmax-Cmin)*(x/H)*(x/H - 1) + Cmax

which is Cmin at x = H/2 and Cmax at x = 0 and x = H

Or whatever you wish to depict your initial distribution.

br
Lasse
Hi Let's say that you membrane has a thickness H and the maximum concentration in the membrane is Cmax, and minimum concentration is Cmin. If you wish, e.g. a parabolic distribution in the membrane, make an initial concentration 4*(Cmax-Cmin)*(x/H)*(x/H - 1) + Cmax which is Cmin at x = H/2 and Cmax at x = 0 and x = H Or whatever you wish to depict your initial distribution. br Lasse
Ximena Paz Barrios Pizarro
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Posted: 10 years ago 12 déc. 2014, 08:25 UTC−5
Thank you!

It works perfectly! :)
Thank you! It works perfectly! :)

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