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radiation problem in COMSOL/FEMLAB

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Old   May 16, 2006, 18:54
Default radiation problem in COMSOL/FEMLAB
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i am trying to solve a radiation problem with COMSOL "general heat transfer" with surface to surface radiation (dependent variables temperature T et radiosity J) where i d like to simulate a semitransparent body. since COMSOL assumes a opaque surface the reflectivity is 1 - emissivity, what is not true in this case. the problem in my modifications lies in the modification of rhe radiosity expression J0=J (defaulte value). independent what expression I give for J0 it does not change. every time sending the same radiosity value to the other surfaces as it would do for an opaque surface. So how can I change the radiosity expression in a right way J0 = emissivity*sigma*T^4+reflectivity*irradiation instead of J0=J=emissivity*sigma*T^4+(1 - emissivity)*irradiation.

Thanks in advance for your help!!!
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Old   May 30, 2006, 03:09
Default Re: radiation problem in COMSOL/FEMLAB
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hello. I am a student of mechanical engineering. my ms project is about thermal cracking furnace. I need the code or software to simulate furnace. if lts posible for you to send for me a solved problem about simulation of furnace whit FEMLAB I will be plesure.
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