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heat transfer coefficient

Posted Mar 10, 2011, 3:48 p.m. EST Heat Transfer & Phase Change Version 4.0a 2 Replies

Faraz Monifi
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Hi
I am an Electrical Engineer and I am not much familiar with heat transferring issues. I have a structure made of silcon and silica and I need to know how does it dissipate heat. In the martial property I have to set "heat transfer coefficient" and I don't know what is that and even there isn't any littérateur on heat transfer coefficient of silicon or silica. Can anybody give me some idea?

Thanks
Faraz
2 Replies Last Post Mar 11, 2011, 1:27 a.m. EST
Ozgur
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Posted: 1 decade ago Mar 10, 2011, 6:13 p.m. EST
Heat transfer coefficient is not a property of the material, but of everything around it. If the air around your boundary is very stagnant, the coefficient may be 5-10 W/m^2/K. If it is moving fast, as in blown over by a CPU fan, it may be higher, perhaps around 50-100 W/m^2/K

Hope this helps.

Ozgur


Hi
I am an Electrical Engineer and I am not much familiar with heat transferring issues. I have a structure made of silcon and silica and I need to know how does it dissipate heat. In the martial property I have to set "heat transfer coefficient" and I don't know what is that and even there isn't any littérateur on heat transfer coefficient of silicon or silica. Can anybody give me some idea?

Thanks
Faraz


Heat transfer coefficient is not a property of the material, but of everything around it. If the air around your boundary is very stagnant, the coefficient may be 5-10 W/m^2/K. If it is moving fast, as in blown over by a CPU fan, it may be higher, perhaps around 50-100 W/m^2/K Hope this helps. Ozgur [QUOTE] Hi I am an Electrical Engineer and I am not much familiar with heat transferring issues. I have a structure made of silcon and silica and I need to know how does it dissipate heat. In the martial property I have to set "heat transfer coefficient" and I don't know what is that and even there isn't any littérateur on heat transfer coefficient of silicon or silica. Can anybody give me some idea? Thanks Faraz [/QUOTE]
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 11, 2011, 1:27 a.m. EST
Hi

my engineering "rule of thumb" values are:

1 atm air, normal temperature 20°C

very calm air 2[W/m^2/K]
normal laboratory air 5[W/m/K]
gentle air bow 10[W/m/K]
forced air blow 20-40[W/m/K]

--
Good luck
Ivar
Hi my engineering "rule of thumb" values are: 1 atm air, normal temperature 20°C very calm air 2[W/m^2/K] normal laboratory air 5[W/m/K] gentle air bow 10[W/m/K] forced air blow 20-40[W/m/K] -- Good luck Ivar

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