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What's the differences between the external emissivity and the internal emissivity

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Old   February 2, 2010, 07:17
Question What's the differences between the external emissivity and the internal emissivity
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Hello,I'm faced with a problem when simulating the radiation of heat transfer. I don't know how to define the emissivity coz there are two different emissivities in DO model in FLUENT. I also have looked to the FLUENT help documents but I found nothing.
Could anybody explain to me?
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Old   January 7, 2013, 23:49
Default Same situation
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Odakkattuvalasu
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Hi dude, I am facing similar situation. What is external emissivity and internal emissivity?
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Old   January 8, 2013, 01:08
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Saeed Sadeghi
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each wall or plate has two faces. internal means the face that is connected to the adjacent zone and external is the outer face.
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Old   January 8, 2013, 01:12
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Ok. emissivity of a surface depends on the material of the surface right? Or does it also depend on the environement to which the surface is exposed? If the wall is made of one material then shouldn't the internal and external emissivity be the same?

Thanks a lot for sharing your opinion.

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