Help needed in COMSOL3.3a-heat transfer module

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SUMMARY

The discussion revolves around using COMSOL 3.3a for a heat transfer problem in 3D, specifically focusing on a micro-scale heating device designed similarly to components in the library. The user seeks clarification on setting the heat flux radiative boundary and determining the heat transfer coefficients for materials such as Silicon (Si), Silicon Dioxide (SiO2), and Iron (Fe). It is established that the conductive transfer coefficients must be referenced from material libraries, typically measured in W/m², and that when scaling from meter to micron and nanometer ranges, only the geometry of boundaries and subdomains needs adjustment.

PREREQUISITES
  • Familiarity with COMSOL Multiphysics 3.3a
  • Understanding of heat transfer principles, particularly in micro-scale applications
  • Knowledge of material properties, specifically thermal conductivity for Si, SiO2, and Fe
  • Experience with scaling laws in thermal analysis
NEXT STEPS
  • Research the thermal conductivity values for Silicon, Silicon Dioxide, and Iron in micro-scale applications
  • Learn how to set up radiative boundary conditions in COMSOL Multiphysics
  • Explore the implications of scaling geometries in heat transfer simulations
  • Investigate the effects of size reduction on heat transfer coefficients in micro and nano domains
USEFUL FOR

This discussion is beneficial for thermal engineers, researchers working on micro-scale heat transfer applications, and users of COMSOL Multiphysics looking to optimize their simulations in the heat transfer module.

rr00053
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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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