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Problem in Nernst-Planck

Posted 27.09.2016, 16:26 GMT-4 0 Replies

Lasse Murtomäki
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In the Nernst-Planck module one of the species is solved from the electroneutrality condition. Fair enough, but that does not suffice. I tried to simulate a system of two metal cations being reduced at the electrode - at different redox potentials, naturally. There is also H+ that does not react yet (zero flux) and an inert anion, bisulphate. Selecting bisulphate as the species that is calculated from electroneutrality, I loose its control at the electrode. I should give it the zero flux condition, but it does not appear because it is not a free variable. Solving the problem gives a non-zero bisulphate flux at the electrode (I solve steady-state).

If I recall right, in an earlier version of Comsol Nernst-Planck had an option of not applying electroneutrality.

Any comments?

0 Replies Last Post 27.09.2016, 16:26 GMT-4
COMSOL Moderator

Hello Lasse Murtomäki

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