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How to calculate the mass fraction of species in Fluent?

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Old   May 21, 2010, 04:41
Default How to calculate the mass fraction of species in Fluent?
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Li
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Hi everyone,

I am running a simulation in a room to see the NH3 concentration distribution. I know the emission surface concentration is A mg/m3. How should I calculate the NH3 mass fraction to define the boundary condition on the emission surface? I tried in this way, let's say ventilation rate is Q m3/s, density of air is R kg/m3, then the NH3 mass fraction on the emission surface is: A*1.0E-06*Q/(Q*R)? Is this correct?

After the simulation was finished, the result is far away from the measurement, so I checked the value of NH3 on the emission surface and it gave me totally different value of molar concentration of NH3. Anyone has this problem? Thanks a lot!

Li
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