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Mass-averaged and Volume-averaged problems...

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Old   May 21, 2009, 08:57
Default Mass-averaged and Volume-averaged problems...
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Hi !

I am running a simulation of ammonia combustion in a ICE. I wanted to plot average pressure, temperature, and species concentration during the cycle.
I used for that the option "volume-averaged" in solve==> monitors ===> volume...
But i don't really know the difference between this and "mass-averaged" . I know it already has been discussed, and it seems that for compressible fluids, "volume averaged" is ok for pressure... but what for the species concentration ?

I mean, i want to compare for example exhaust NO mole fraction with existing results, should i use "mass-averaged" ?

Thanks a lot !
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