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.
Undefined Variable
Posted 26.04.2019, 21:08 GMT-4 Electromagnetic Heating, Fluid & Heat, General Version 5.3 0 Replies
Please login with a confirmed email address before reporting spam
Hi
I am trying to model the heat transfer performance of a helix electric heating element in a packed bed with air flowing into the bed. The heating element is inside the packed bed. When I run the model, it tells me that sigma required by current conservation is not defined. However I actually defined that value in the material node. What is the problem?
Another question is that I simulate the packed bed as porous media. I just tick the porous media box in Heat Transfer in Fluids and put some physical properties for the porous media. I also add Solid (that heating element) in Heat Transfer in Fluids node. I wonder if doing like this takes heat conduction between heating element and porous media into consideration.
Please check my file (5.3 version) and thank you very much!
Attachments:
Hello San Zhang
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.