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.

How To Apply Boundary Conditions In A Solid Fulid Heat Transfer?

Posted 12 mai 2019, 06:44 UTC−4 Structural & Acoustics, Fluid & Heat, Chemical Reaction Engineering Version 5.3 2 Replies

Long Chen
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi ! I am currently doing a two dimensional simulation of a reactor. Chemical reaction take place in this reactor. The reactor is a cylinder reactor. I set up a two-dimensional axial symmetry model to simulate this process. In the core of the cylinder a cooling pipe run through the cylinder and water flow through the cooling pipe taking the heat away. I use heat transfer in porous media to simulate the process in the reactor, and laminar flow, heat transfer in fluid to simulate the heat transfer in the cooling water. Finally I use heat transfer in solid to simulate the heat transfer in the cooling pipe wall. However, I dont konw how to apply boundary conditions between the cooling pipe wall ,the reactor and the cooling water. The model figure is attached. Could anyone tell me how to solve this problem? Thanks in advance!!

I dont konw how to apply boundary conditions between the reactor and the cooling pipe wall, and boundary conditions between the cooling pipe wall and cooling water in order to make the heat transfer from the reactor to the cooling water.

2 Replies Last Post 13 mai 2019, 08:07 UTC−4
Jim Freels mechanical side of nuclear engineering, multiphysics analysis, COMSOL specialist
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 5 years ago 12 mai 2019, 23:10 UTC−4

Heat transfers by conduction, convection, and radiation. You can probably ignore radiation unless you have some extreme heating which this does not appear to be. The conduction will take place "naturally" by setting up your model. Then you need to add heat transfer by convection. If you use bulk flow in the cooling pipe, you can use a heat transfer coefficient at the boundary. If you intend to simulate with more accuracy, you can use a heat convection boundary condition by laminar or turbulent flows in the heat transfer module.

-------------------
James D. Freels, Ph.D., P.E.
Heat transfers by conduction, convection, and radiation. You can probably ignore radiation unless you have some extreme heating which this does not appear to be. The conduction will take place "naturally" by setting up your model. Then you need to add heat transfer by convection. If you use bulk flow in the cooling pipe, you can use a heat transfer coefficient at the boundary. If you intend to simulate with more accuracy, you can use a heat convection boundary condition by laminar or turbulent flows in the heat transfer module.
Long Chen
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 5 years ago 13 mai 2019, 08:07 UTC−4

Thank you very much !

Thank you very much !

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