Learning Forum

[ozankekul]

Hello, 

I have to calculate NO emissions in ppm at referenced O2. For example 15%O2. I have seen a formula (NO ppm =  NO mole fractionx 10^6 / 1-mole fraction of H2O)  in fluent tutorial file but i think this formula is not enough for my case. 

I you provide some support, i appreciate. 

Thanks, 

 

[Rob]

Are you using a NOx model or forming NOx as part of a defined reaction scheme? 

[ozankekul]

Hello Rob, 

I m simulating NH3/H2/air combustion via eddy dissipation model. After the solution obtained from EDM, i use NOx post processor and try to predict NO emissions. I want to convert the NO predictions to referenced O2 (e.g. 15%).

Thanks, with my best regards. 

 

Ozan 

 

[Rob]

The model should return a volume fraction or the like. You can use Expressions or Custom Field Functions to convert that volume fraction to something else. CFFs are the old way of doing it, and always use SI units as the input & output regardless of what units you're using.