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 The information provided may be out of date.

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stratification

Posted Mar 12, 2014, 5:53 a.m. EDT Heat Transfer & Phase Change, Structural Mechanics Version 4.3a 3 Replies

Mikhail Polous
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Hi everyone!
Let's picture three objects densely pressed to each other. First object is heated, the other one is cooled, and the third is in between. Certain temperatures cause a gap between objects because of thermomechanical expansion and different properties of materials. How to make the progam see that three objects pressed to each other are not a single object? How to make in the program a microscopic gap between objects without geometrical modeling?

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3 Replies Last Post Mar 13, 2014, 10:04 a.m. EDT
Niklas Rom COMSOL Employee

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Posted: 1 decade ago Mar 12, 2014, 8:22 a.m. EDT
Hi Mikhail,
this is called thermal contact. See the two downloadable examples:
www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119
www.comsol.com/model/thermal-contact-resistance-between-an-electronic-package-and-a-heat-sink-14659

kind regards,
Niklas



Hi everyone!
Let's picture three objects densely pressed to each other. First object is heated, the other one is cooled, and the third is in between. Certain temperatures cause a gap between objects because of thermomechanical expansion and different properties of materials. How to make the progam see that three objects pressed to each other are not a single object? How to make in the program a microscopic gap between objects without geometrical modeling?


Hi Mikhail, this is called thermal contact. See the two downloadable examples: http://www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119 http://www.comsol.com/model/thermal-contact-resistance-between-an-electronic-package-and-a-heat-sink-14659 kind regards, Niklas [QUOTE] Hi everyone! Let's picture three objects densely pressed to each other. First object is heated, the other one is cooled, and the third is in between. Certain temperatures cause a gap between objects because of thermomechanical expansion and different properties of materials. How to make the progam see that three objects pressed to each other are not a single object? How to make in the program a microscopic gap between objects without geometrical modeling? [/QUOTE]
Mikhail Polous
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Posted: 1 decade ago Mar 12, 2014, 9:00 a.m. EDT
Niklas Rom, thanks a lot!
Niklas Rom, thanks a lot!
Mikhail Polous
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Posted: 1 decade ago Mar 13, 2014, 10:04 a.m. EDT

Hi Mikhail,
this is called thermal contact. See the two downloadable examples:
www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119
www.comsol.com/model/thermal-contact-resistance-between-an-electronic-package-and-a-heat-sink-14659

kind regards,
Niklas


In the example (www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119), it is written that:

HEAT TRANSFER IN SOLIDS
Pair Thermal Contact 1
1 On the Physics toolbar, click Pairs and choose Pair Thermal Contact.
2 In the Pair Thermal Contact settings window, locate the Pair Selection section.
3 In the Pairs list, select Contact Pair 1.
4 Locate the Contact Surface Properties section. From the p list, choose Contact
pressure (solid/cnt1)...

but section Pairs does not contain Pair Thermal Contact ... I have 4.3a version... Where can I find Pair Thermal Contact?

[QUOTE] Hi Mikhail, this is called thermal contact. See the two downloadable examples: http://www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119 http://www.comsol.com/model/thermal-contact-resistance-between-an-electronic-package-and-a-heat-sink-14659 kind regards, Niklas [/QUOTE] In the example (http://www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119), it is written that: HEAT TRANSFER IN SOLIDS Pair Thermal Contact 1 1 On the Physics toolbar, click Pairs and choose Pair Thermal Contact. 2 In the Pair Thermal Contact settings window, locate the Pair Selection section. 3 In the Pairs list, select Contact Pair 1. 4 Locate the Contact Surface Properties section. From the p list, choose Contact pressure (solid/cnt1)... but section Pairs does not contain Pair Thermal Contact ... I have 4.3a version... Where can I find Pair Thermal Contact?

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