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What are the 21 numbers in reactingFoam/constant/thermo.compressibleGas?

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Old   March 24, 2011, 16:13
Default What are the 21 numbers in reactingFoam/constant/thermo.compressibleGas?
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Scot Johnson
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The reactingFoam tutorial is about combustion of methane, so in constant/thermo.compressibleGas is the list of reactants and products. Each one, such as O2, has 21 numbers associated with it. The second number is molecular weight, but what are the 20 others? I sure wish the user's guide had more. Thank you, very much indeed, for any help you can provide! Scot
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Old   March 26, 2011, 15:11
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Valerio Novaresio
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Hi Scot,

let me take the O2 like an example:

O2 O2 1 31.9988
200 5000 1000
3.69758 0.00061352 -1.25884e-07 1.77528e-11 -1.13644e-15 -1233.93 3.18917
3.21294 0.00112749 -5.75615e-07 1.31388e-09 -8.76855e-13 -1005.25 6.03474
1.67212e-06 170.672

2 number -> molar weight (31.9988)

3 - 5 numbers -> temperature ranges where the interpolations are valid (min T = 200 K, max T = 5000 K, "middle" T = 1000 K. So we have two ranges: from 200 K to 1000 K and from 1000 K to 5000 K)

6 - 12 numbers -> seven coefficients for Janaff interpolation (cp, h, S) for the first temperature range (3.69758 0.00061352 -1.25884e-07 1.77528e-11 -1.13644e-15 -1233.93 3.18917)

12 - 19 numbers -> seven coefficients for Janaff interpolation (cp, h, S) for the second temperature range (3.21294 0.00112749 -5.75615e-07 1.31388e-09 -8.76855e-13 -1005.25 6.03474)

20 - 21 numbers -> coefficients for Sutherland interpolation for viscosity (1.67212e-06 170.672)

Regards,

Valerio
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Old   April 4, 2011, 09:43
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Scot Johnson
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Thank you, Valerio!
Scot
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Old   April 4, 2014, 08:47
Default coeff for Argon ?
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Mieszko Młody
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Dear Foamers,
Do you now any place I could find these values for Argon ?
temperature range 87 - 400K ?
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Old   April 4, 2014, 12:28
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Tom
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Hi ziemowitzima
In the following links you can find some tables of Argon:
http://www.nist.gov/data/PDFfiles/jpcrd363.pdf
and
http://contrails.iit.edu/DigitalColl...CTDR64-068.pdf

If you want to know about the liquid phase check:
http://encyclopedia.airliquide.com/encyclopedia.asp?
There you can find properties of nitrogen, carbon, dioxide, argon, hydrogen and oxygen. Between those properties: Density & temperature calculation of the liquid phase, based on the pressure.

Regards!
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Old   April 5, 2014, 05:59
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Thank you !
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Old   October 1, 2014, 09:27
Default get the thermo data
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Hi,
Does anybody know how to retrieve the data in thermo.CompressibleGas from code? Reactingfoam code defines this object:
Code:
psiReactionThermo& thermo = reaction->thermo();
as well as:
Code:
basicMultiComponentMixture& composition = thermo.composition();
Both of them have valuable information butI cannot see how to get these values from these objects. One way could be to read the whole dictionary but this is not the most efficient way.

Any ideas?
Thanks
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