Help: "Ions-Transport"
Hello guys; first, sorry for my bad english :D.
I have to simulate a single-phase system, with anions and cations diffuse in an aqueous solution. Ions and cations are obviously scalars. How can I insert the effects due to electrical interactions? How can I insert the condition: C = A in each element (electroneutrality)? where A and C are the concentrations of anions and cations, respectively thanks |
Maybe I didn't explain well...
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If A=C then why model two concentrations? Just model one and the other will be the same. This is easily done with a additional variable.
But I do not know what electrical interactions you wish to include. |
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I have to consider the electrical interactions in the transport equation as an additional term, as a source term. I just found an expression like this: S+ = - σ / ε * (C-A) and S- = σ / ε * (C-A) But the very low value of the costant "ε " (dielectric constant = 2,21 E-10) is a problem for the solver, a numerical problem, I think. |
But again, you said A=C so the expression evaluates to zero.
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