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.

Radiation heating

Please login with a confirmed email address before reporting spam

Hello,

we are trying to solve the following problem:

We have four radiant heaters on top of a rectangular cavity and two at the bottom. So, we could set up a symmetric problem two at the top and one at the bottom.
we would like to solve this problem as a radiant heating including the natural convection inside the cavity while a copper mass is included in the center (for this the heat flux going into the copper mass will be calculated).
the first question is about solving the radiation: we are applying a power boundary for the radiant heaters, but there does not seem to increase the temperature around the heaters to to start up the natural convection in the air.
when we apply a variable temperature boundary on the radiant heaters, it seems to work (but not with higher temperatures e.g. 1000 K), but the temperature of the copper mass becomes unphysical (lower than its initial temperature).
We set up the problem as surface to surface radiation problem among the walls of the cavity and the heaters. this is very similar to the `bulb` tutorial given in the comsol help files.
that`s all i can say, and any suggestion will be much appreciated.
thank you,
ferruh

1 Reply Last Post 23 lug 2013, 11:07 GMT-4

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 23 lug 2013, 11:07 GMT-4
Hello Ferruh,

Can you join a sketch of your system and boundary conditions for a better understanding?
Have you succed to modelise your problem now?

Best regards

Julien
Hello Ferruh, Can you join a sketch of your system and boundary conditions for a better understanding? Have you succed to modelise your problem now? Best regards Julien

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.