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Old   September 12, 2003, 10:04
Default Absorption Coefficients
  #1
Mark
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Hi all,

Can anyone tell me how or where i can obtain values for the Absorption Coefficient of metals.

I think i need these values for DO radiation modelling in a furnace using FLUENT, I'm not sure can someone please advise?

Cheers

Mark
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Old   September 15, 2003, 03:01
Default Re: Absorption Coefficients
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Rami
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Hi Mark,

The absorption coefficient (in 1/length units) refers to the relative absorption of radiation along the ray path within a participating medium. This is in contrast to absorptivity of a surface (dimensionless).

Do you treat the metal as a semitransparnt medium using the Discrete Ordinates?

Rami
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Old   September 19, 2003, 05:15
Default Re: Absorption Coefficients
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Erwin
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The absorption coefficient of a solid should be set to 0 in Fluent.
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Old   September 22, 2003, 07:11
Default Re: Absorption Coefficients
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Mark
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Hi Erwin,

Thanks for the advice. Fluent has a default of 0.01 for absorption coeff. for solids. Any comments???

Mark.
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Old   September 22, 2003, 08:22
Default Re: Absorption Coefficients
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Rami
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It is possible to have non-zero absorption for solids if they are participating (i.e., semi-transparent). Glass is a straighforward example.
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