Volumetric source or Inlet source

Kumar

Guys.

I am trying to model Hydrogen dispersion from a box using CFX11. I know how much H2 release from the box. can I define as a volumetric source or inlet source. Which is the correct method ???

If I define as a volumetric source, do I get H2 concentration(v/v) which is always less than initial volumetric source concentration (v/v).

Thanks for your help.

Best Regards Kumar