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Absorption coefficient for aluminium???

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Old   March 2, 2005, 16:15
Default Absorption coefficient for aluminium???
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does anyone know the absorption coefficient for aluminium? I am modelling radiation with the discrete ordinate modell. I have got an incident solar radiation from the exterior into my system. The radiation should heat up the solid material in my system. when it gets heatend a free convetion should be established. I didnīt find any hint which value I should take for the absorption.

I have got double sided walls at the solid-fluid boundaries. What is the "right" "diffuse fraction" for a solid material
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