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Mean absorption coefficient

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Old   October 23, 2021, 04:52
Post Mean absorption coefficient
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bilal
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I am working on a 2D flame and I want to interpret UDF code to fluent in order to add radiation into the flame, I just want to know that what value should I give for absorption coefficient under Planck means absorption coefficient condition.
Note:
Under Planck means absorption coefficient condition, emission value is 1 and emissivity is zero but what value should I consider for absorption coefficient?

Please help
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