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.

Coupling EP and EO in Transport of Diluted Species - no transport/coupling?

Please login with a confirmed email address before reporting spam

I'm working on a simple electrophoresis separation system and running in to a problem where there is no apparent transport of my diluted species, either due to creeping flow (even though flow velocity is present and specified in the TDS module) or electrophoresis (even though a potential is calculated, electromigration is checked, with specified mobilities in the TDS module). Am I missing something about coupling? (Adding a multiphysics > Flow/Potential coupling component does not affect the solution.)



2 Replies Last Post 5 dic 2017, 09:45 GMT-5
Jeff Hiller COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 7 years ago 4 dic 2017, 09:46 GMT-5

Hello,

There may be more to it than this, but I noticed that your velocity at the inlet is on the order of 1 millimeter per second and your computational time is 10 seconds, so you can expect the species to move by about 1 centimeter. Your geometry is on the order of 500 meters long, making a small displacement difficult to observe. Perhaps you did not you mean for the geometry to be so large?

Jeff

-------------------
Jeff Hiller
Hello, There may be more to it than this, but I noticed that your velocity at the inlet is on the order of 1 millimeter per second and your computational time is 10 seconds, so you can expect the species to move by about 1 centimeter. Your geometry is on the order of 500 meters long, making a small displacement difficult to observe. Perhaps you did not you mean for the geometry to be so large? Jeff

Please login with a confirmed email address before reporting spam

Posted: 7 years ago 5 dic 2017, 09:45 GMT-5

Yikes! Supposed to be in ... I usually change that in geometry, but must have overlooked it. Thanks!

Yikes! Supposed to be in \mu m... I usually change that in geometry, but must have overlooked it. Thanks!

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.