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Joule heating on thin films
Posted 09.09.2013, 06:55 GMT-4 Low-Frequency Electromagnetics, Heat Transfer & Phase Change Version 4.3a 2 Replies
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I am struggling since quiet some time with a problem in joule heating in thin films. I have a resistor on a microscope glass slide and I am able to simulate Joule heating on the glass slide. I used the Electric current, Shell and the Heat transfer in solids module. The resistor lines are 50 micrometers wide and 100nm thick (Shell thickness parameter). I used the "Heating Circuit" model (www.comsol.com/model/heating-circuit-465) as an example, ignoring the thermal stress aspects since I am not interested in them.
I want now to simulate the heating of another glass slide placed on top of the heating element (hence partially covering it). The problem now is that the boundary condition "Boundary heat source" that I applied to the circuit is shown as "not applicable" most likely because the second glass slide is covering it. (see the attached file).
Does someone have an idea how to fix this? Maybe the approach I am using is not the right one, if that's the case please let me know.
Many thanks.
Julien
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the boundary heat source is a feature that can also be applied to internal boundaries.
You can check that out with a very simple model, if you like.
So this is not the culprit - maybe some other setting in your model is wrong.
I f you think we should have a look at your model, feel free to submit it to support@comsol.com
Best regards from Technopark Zurich
Sven Friedel
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I tried a much simpler model, and I have the same problem. Could you indicate me where in the User's guide I could find informations about that?
To be more specific:
When I build the rectangle entity on top of the squared entity, I cannot use the "Heat source boundary" or the "highly conductive layer" conditions on the interior boundary highlighted in the attached snapshot.
The interior boundary is not extruded, it is only a drawing on the work plane (i.e. it doesn't go through the whole squared structure).
When there is nothing on top, no problems, it works.
Many thanks.
Julien
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