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Electromagnetic (Optical) heating

Posted Apr 7, 2016, 7:11 a.m. EDT Version 5.0 2 Replies

Hasan Ali
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Hi,

I have a model in which I want to study the induced heat due to absorption of waves in the range of optical frequencies. As the minimum dimensions of my model are near the wavelenths, I am using microwave heating under heat transfer in solids module (electromagnetic waves frq domain+heat transfer in solids).
My question is that which subnode I can use for the absorption of waves at the surface of my model (which is metallic in this case). There is a subnode called "port" under electromagnetic waves but I don't think that can be used for metallic boundary and even if I use that port to define the input power of radiation, the simulation shows a very very high temperature which is not possible.

So, if anybody is working with radiation heating etc and have some idea which type of interface can be used, I would appreciate the help. Thanks

~Hasan Ali
2 Replies Last Post Apr 12, 2016, 4:15 a.m. EDT
Niklas Rom COMSOL Employee

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Posted: 8 years ago Apr 7, 2016, 9:54 a.m. EDT
Hi Hassan,
the Impedance boundary condtion is probably the best choice. There is a blog post about this here:
www.comsol.com/blogs/modeling-metallic-objects-in-wave-electromagnetics-problems/

kind regards
Niklas

Hi,

I have a model in which I want to study the induced heat due to absorption of waves in the range of optical frequencies. As the minimum dimensions of my model are near the wavelenths, I am using microwave heating under heat transfer in solids module (electromagnetic waves frq domain+heat transfer in solids).
My question is that which subnode I can use for the absorption of waves at the surface of my model (which is metallic in this case). There is a subnode called "port" under electromagnetic waves but I don't think that can be used for metallic boundary and even if I use that port to define the input power of radiation, the simulation shows a very very high temperature which is not possible.

So, if anybody is working with radiation heating etc and have some idea which type of interface can be used, I would appreciate the help. Thanks

~Hasan Ali


Hi Hassan, the Impedance boundary condtion is probably the best choice. There is a blog post about this here: https://www.comsol.com/blogs/modeling-metallic-objects-in-wave-electromagnetics-problems/ kind regards Niklas [QUOTE] Hi, I have a model in which I want to study the induced heat due to absorption of waves in the range of optical frequencies. As the minimum dimensions of my model are near the wavelenths, I am using microwave heating under heat transfer in solids module (electromagnetic waves frq domain+heat transfer in solids). My question is that which subnode I can use for the absorption of waves at the surface of my model (which is metallic in this case). There is a subnode called "port" under electromagnetic waves but I don't think that can be used for metallic boundary and even if I use that port to define the input power of radiation, the simulation shows a very very high temperature which is not possible. So, if anybody is working with radiation heating etc and have some idea which type of interface can be used, I would appreciate the help. Thanks ~Hasan Ali [/QUOTE]
Hasan Ali
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Posted: 8 years ago Apr 12, 2016, 4:15 a.m. EDT
Dear Niklas,

Thanks for your suggestions.

Regards

Hasan Ali
Dear Niklas, Thanks for your suggestions. Regards Hasan Ali

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