Menu

Discussion Forum

New Discussion
Filter

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Concentration profile problem

Posted Nov 21, 2023, 7:12 a.m. EST Version 6.1 0 Replies

Lasse Murtomäki
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

I have a model of a charged capillary with negative charge on its walls. When calculating the electrolyte flux across is, I reach incorrect concentration profiles outside the capillary, see attached images. This makes the flux and electric current discontinuous.

The physics is Laminar flow + Nernst-Planck-Poisson equation. Volume force within the capillary is

roo_e*dV/dx

where roo_e is the volume charge density. Capillary resides between 0 and 20 µm and aqueous diffusion boundary layers between -20...0 and 20...40 µm.

ConcProfile picture is for the cation (Na+).

0 Replies Last Post Nov 21, 2023, 7:12 a.m. EST
COMSOL Moderator

Hello Lasse Murtomäki

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content