Help needed in COMSOL3.3a-heat transfer module

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The discussion revolves around using COMSOL 3.3a for a 3D heat transfer problem involving a micro-scale heating device with layers of silicon, silicon dioxide, and iron. The user seeks clarification on setting the heat flux radiative boundary and the appropriate heat transfer coefficients for each material, questioning if these values change when scaling from meter to micron and nanometer ranges. It is noted that the conductive transfer coefficients should be looked up unless available in the material library, typically measured in W/m². The main scaling consideration involves adjusting the geometry of boundaries and subdomains, while the user expresses concern about how size reduction might affect the heat transfer coefficients. Overall, accurate material properties and careful scaling are crucial for successful modeling in COMSOL.
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urgent help needed in COMSOL3.3a-heat transfer module

hi friends...
I am doing a heat transfer problem in 3D...I have designed a heating device in micro range (exactly similar to the heating device in component library) and kept 3 layers of blocks of material (Si, SiO2, Fe ). I am confused about setting the heat flux radiative boundary...what is the value of heat trasnfer coeffecient of each block ? is it similar to the value in meter range? how can I find out these values...also when scaling a problem like this from metre range to microns and nanometre range what all parametres should also be manually changed?
Please help me out...Thanks in advance
 
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The conductive transfer coefficients you will have to look up for each material unless they are already in your material library. This value is usually in units of W/m^2. In terms of scaling, the only thing you should have to scale is the geometry of your boundaries and sub domains.
 


Hi Topher925...thankyou for the response...I can find out the values of heat transfer coeefecient for the different materials...but according to the definition it is the rate of heat transfer through the raditive walls,,, but wen we scale down the size won't it affect the heat transfer coeffecient?
 

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