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Nernst plank module in comsol 4.0a
Posted 5 févr. 2011, 03:39 UTC−5 2 Replies
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I am trying to model an electrochemical cell in order to predict i-V curves, I use Nernst planck module, and I have 2 species , one of them is oxidizing and other is reducing. I have 2 problem:
(ny solution is c1=Potassium(k+) , C2=ferrocyanide(-4) and c3=ferricyanide(-3))
1- I define 3 species because 1 species is based on electroneutrality, but in simulation I received some negative concentration!?
2- concentration of other reducing species did not change, do I need to reaction engineering physics for defining these equetion? O+e=R
(ny solution is c1=Potassium(k+) , C2=ferrocyanide(-4) and c3=ferricyanide(-3))
1- I define 3 species because 1 species is based on electroneutrality, but in simulation I received some negative concentration!?
2- concentration of other reducing species did not change, do I need to reaction engineering physics for defining these equetion? O+e=R
2 Replies Last Post 23 févr. 2011, 15:23 UTC−5
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Posted:
1 decade ago
Hi,
Check your boundary conditions. If you have applied constant flux condition at any of the boundary, you will get negative concentrations. you need to change BC.
good luck
Mahendra
Check your boundary conditions. If you have applied constant flux condition at any of the boundary, you will get negative concentrations. you need to change BC.
good luck
Mahendra
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Posted:
1 decade ago
hi
Thank you for your consideration, But I did not define constant Flux in boundary condition, for my model, diffusion is important, so I can use dilute species but my big problem is how can software understand about reaction, because concentration of one spices in reaction with simulation is zero ,if any one knw about that please help me.
Thank you for your consideration, But I did not define constant Flux in boundary condition, for my model, diffusion is important, so I can use dilute species but my big problem is how can software understand about reaction, because concentration of one spices in reaction with simulation is zero ,if any one knw about that please help me.