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Nernst-Planck equation without electroneutrality

Posted 19 mar 2021, 05:02 GMT-4 Chemical Reaction Engineering Version 5.5 2 Replies

JooA Moon
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Hello,

I am working on a pH responsive hydrogel simultion in comsol I need a Nernst-Planck equation without electroneutrality section, but i can't find it in version 5.5 Is there any alternative way to solve this problem？ Any tips or suggestion will be greatly appreciated, thank you.

2 Replies Last Post 19 apr 2021, 08:41 GMT-4
Lasse Murtomäki
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Posted: 4 years ago 7 apr 2021, 03:09 GMT-4

Nernst-Planck-Poisson.

Lasse

Nernst-Planck-Poisson. Lasse
Wei Liu
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Posted: 4 years ago 19 apr 2021, 08:41 GMT-4

Nernst-Planck-Poisson.

Lasse

Hi Lasse,

I am studying ion and potential distribution in a microchannel, a 2D model was built in comsol 5.5. I coupled Nernst-Planck equation with Poisson equation but I didn't get a, say, EDL distribution of ion in this microchannel, what i got it's a homogeneous distribution of ion and also potential in the whole domain. Is there any alternative way to solve this problem？(it seems it's just a electroneutral model) I put my model in the attachment, could someone help me with it? Thanks a million in advance！

>Nernst-Planck-Poisson. > >Lasse Hi Lasse, I am studying ion and potential distribution in a microchannel, a 2D model was built in comsol 5.5. I coupled Nernst-Planck equation with Poisson equation but I didn't get a, say, EDL distribution of ion in this microchannel, what i got it's a homogeneous distribution of ion and also potential in the whole domain. Is there any alternative way to solve this problem？(it seems it's just a electroneutral model) I put my model in the attachment, could someone help me with it? Thanks a million in advance！

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