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-   -   Physical properties of radicals for NOx modelling (http://www.cfd-online.com/Forums/cd-adapco/52903-physical-properties-radicals-nox-modelling.html)

Jirka May 10, 2002 09:13

Physical properties of radicals for NOx modelling
 
I have trouble finding physical properties (for the file props.dbs) of radicals (O,H,OH) which I need to model in order to be able to get good predictions of NOx emissions. Has anybody experience with this and/or can suggest some good source for these properties?

The properties are namely density, Cp, molecular viscosity, thermal conductivity, heat and temperature of formation. Btw, the heats of formation of hydrocarbons included in the database surprisingly don't correspond with commonly available data. What's your suggestion?

Thanks, Jirka.

Kalyan May 10, 2002 13:38

Re: Physical properties of radicals for NOx modell
 
Try looking on the NIST website. You can get most of the data you need.

Jirka May 13, 2002 03:30

Re: Physical properties of radicals for NOx modell
 
Thanks, but I tried this one as well as CEA/NASA site, and the data published there is not complete.

Maybe if there's someone with personal experience of NOx modelling in Star..?

Daniel May 13, 2002 12:32

Re: Physical properties of radicals for NOx modell
 
The properties of NOx you asked about have practically no influence on the fluid properties, since their concentrations in the fluid are very small. These properties are not used by STAR-CD since you define the scalars for these species as passive.

Jirka May 14, 2002 04:08

Re: Physical properties of radicals for NOx modell
 
Yes, thank you, Daniel, but my question applies to the situation when you use PPDF modelling, not local source. For the first approach you need the properties for proper calculation of NOx levels even though they are certainly not important for the flow solution.

ken May 19, 2002 01:45

Re: Physical properties of radicals for NOx modell
 
density - equation of state (ideal gas law) Cp, enthalpy, heat of formation - NIST WEBBOOK Viscosity, conductivity , binary diffusion coefficient - gas kinetic theory (statistical mech)


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