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-   -   Mass Diffusion Coefficient: (https://www.cfd-online.com/Forums/fluent/135965-mass-diffusion-coefficient.html)

nvarma May 20, 2014 15:02

Mass Diffusion Coefficient:
 
In multi-species modelling without reactions, how does fluent calculate the default value of Diffusion coefficient?


For instance, I have a case with water vapour and Nitrogen, if I choose the "constant-dilute-approx", the default value is 2.88e-5.

What is the accuracy of this value? How is this calculated?


Will it be any better if I use multicomponent method?


Any help in this regard is greatly appreciated! Even links/references would do.

Thanks


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