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Meaning of diffuse fraction,emissivity,absorption.

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Old   February 19, 2007, 12:24
Default Meaning of diffuse fraction,emissivity,absorption.
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Hi all, i'm working with DO radiation in Fluent. I want to know better the meaning of "diffuse fraction","internal emissivity","absorption". If i have a UV lamp defined as wall that emitted radiation 500 W/m^2, how can i define a near wall as a mirror? which parameters i must set? i want a specular reflection, not absorption,not trasmissivity. Please help me. Thanks in advance.
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Old   August 16, 2009, 13:00
Default diffuse reflectivity specular reflectivity absorptivity
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diffuse reflectivity = diffuse fraction(1-internal emissivity)
specular reflectivity = 1- diffuse fraction
absorptivity= diffuse fraction* internal emissivity
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Old   March 31, 2017, 08:58
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Dear Zhang ?
Where did u come with those relations ? are you sure they 're right ?
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