Menu

Discussion Forum

New Discussion
フィルター

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

Thermal conductivity

Posted 2012/07/04 7:50 GMT-4 Heat Transfer & Phase Change, Parameters, Variables, & Functions Version 4.2a 3 Replies

Philip Jönsson
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi
I have a geometry mith two different materials and i want to know the thermal conductivity of the whole geometry. I know how to use COMSOL to evaluate the thermal conduktivity but i want to know what COMSOL is doing when it evaluate it.

If anyone could tell me this I would be the happiest man alive.

Thanks in advance.
3 Replies Last Post 2013/12/18 12:13 GMT-5
Chraibi Omar
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012/07/10 4:59 GMT-4
Hi Philip,

I have the same problem. I have a non homogen geometry with two materials and I would like figure the equivalent thermal conductivity.

Normally, to calculate the equivalent thermal conductivity we should use the "heat flux". But I don't know how can I use this condition.

Once you have the total flux then you can calculate the conductivity using :

phi=-lambda*S*grad T

Thank you.




Hi Philip, I have the same problem. I have a non homogen geometry with two materials and I would like figure the equivalent thermal conductivity. Normally, to calculate the equivalent thermal conductivity we should use the "heat flux". But I don't know how can I use this condition. Once you have the total flux then you can calculate the conductivity using : phi=-lambda*S*grad T Thank you.
Nagi Elabbasi Facebook Reality Labs
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012/07/10 11:16 GMT-4
Hi Philip,

Thermal conductivity is a material property not a property of a whole geometry. I guess you mean the equivalent or effective thermal conductivity had your geometry been made of a uniform material. COMSOL solves the heat equation in each part of the geometry using its own thermal properties. You can then extract the effective properties via post-processing.

Note that for many multi-material systems the effective thermal conductivity will be different in different directions, even though all the constituents have isotropic values.

Nagi Elabbasi
Veryst Engineering
Hi Philip, Thermal conductivity is a material property not a property of a whole geometry. I guess you mean the equivalent or effective thermal conductivity had your geometry been made of a uniform material. COMSOL solves the heat equation in each part of the geometry using its own thermal properties. You can then extract the effective properties via post-processing. Note that for many multi-material systems the effective thermal conductivity will be different in different directions, even though all the constituents have isotropic values. Nagi Elabbasi Veryst Engineering
Marziye Mirbagheri
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2013/12/18 12:13 GMT-5
Hello,

I am very new in COMSOL and trying to calculate effective thermal conductivity in 2D but I am not sure how to do this. I know I need to find heat flux but I am not sure if I am doing the process correct. I'd appreciate any help and explain to solve this problem.

Thanks and Regards,
Marziye.
Hello, I am very new in COMSOL and trying to calculate effective thermal conductivity in 2D but I am not sure how to do this. I know I need to find heat flux but I am not sure if I am doing the process correct. I'd appreciate any help and explain to solve this problem. Thanks and Regards, Marziye.

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