|July 12, 2007, 12:51||
Mass transfer units in fluent
Hi all, I hope someone can give me an advice in this topic.
In Fluent's UDF manual it is stated that the units that must be returned in a DEFINE_MASS_TRANSFER UDF are kg/m3.
Commonly mass transfer coefficients are in kg/m3-s so for non-steady simulations it is possible to multiply by the current time step and the units are fullfilled, but in steady state it is not possible.
I have been told that UDF manual is a misprint and that the returned units are always kg/m3-s, but my simulations in steady state gave me too high mass transfer values, while non-steady simulations with the units as asked in the manual, are correct.
Can anybody help me in this?
If it is not a problem with the manual how can I circumvent the units affair in steady state?
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