Menu

Discussion Forum

New Discussion
Filtrer

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.

Diffusion in thin film

Posted 21 juil. 2018, 15:27 UTC−4 Chemical, Heat Transfer, Structural Mechanics Version 5.3a 1 Reply

Bilal Abdul Halim
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello. I'm trying to simulate diffusion of CO2 molecules in a thin film polymer under certain pressure and temperature for a set time. However, I don't have the Chemical Engineering Module, but have the Fluid one. Is there a way I could simulate that? (Im running 5.3a)

1 Reply Last Post 23 juil. 2018, 06:02 UTC−4
Suresh Seetharam
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 6 years ago 23 juil. 2018, 06:02 UTC−4

Hi,

Your question is not very clear because you do not explain how you want to model it.

If you want to explicitly model diffusion through a thin film layer such as a tube in 3D or rectangular plate in 2D, then just use PDE form and invoke only those terms in the PDE that you need. This is very easy.

If you do not want to represent the thin film explicitly to avoid meshing difficulties, especially, if it is a part of a significantly larger domain (as in fractures), then you can once again use boundary PDEs and achieve the same.

The most important thing to remember is that you ensure that the governing equation you have at hand is correctly represented in the PDE form.

Suresh

Hi, Your question is not very clear because you do not explain how you want to model it. If you want to explicitly model diffusion through a thin film layer such as a tube in 3D or rectangular plate in 2D, then just use PDE form and invoke only those terms in the PDE that you need. This is very easy. If you do not want to represent the thin film explicitly to avoid meshing difficulties, especially, if it is a part of a significantly larger domain (as in fractures), then you can once again use boundary PDEs and achieve the same. The most important thing to remember is that you ensure that the governing equation you have at hand is correctly represented in the PDE form. Suresh

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