Mass fraction/Mole fraction
Hi, I have a geometry which has reaction in it. My problem is that I want the reaction term to be in terms of mole fraction and not mass fraction. How do I input the "source term" in terms of mole fraction??
Please help. thanks in advance, Vikram 
Use a CEL expression to do the conversion.

Hi Glenn,
I am also trying to figure out how to convert mass fraction to mole fraction. Can you please show us the CEL expression to do the conversion? Thanks a lot. 
The equation is here:
http://en.wikipedia.org/wiki/Mole_fraction The variables and functions are listed in the CFX reference guide. 
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