# greyMeanAbsorptionEmission

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 July 24, 2013, 06:59 greyMeanAbsorptionEmission #1 New Member   Maria Join Date: Apr 2009 Posts: 12 Rep Power: 17 Hi all, Could anyone tell me a book/paper/reference where to find the species polynomial coefficients required to calculate the absorptivity coefficient according to the "greyMeanAbsorptionEmission" model? In other words, does anybody know where following coefficients come from? ************************************************** **************************** CO2 { Tcommon 300; //Common Temp invTemp true; //Is the polynomio using inverse temperature. Tlow 200; //Low Temp Thigh 2500; //High Temp loTcoeffs //coefss for T < Tcommon ( 0 // a0 + 0 // a1*T + 0 // a2*T^(+/-)2 + 0 // a3*T^(+/-)3 + 0 // a4*T^(+/-)4 + 0 // a5*T^(+/-)5 + ); hiTcoeffs //coefss for T > Tcommon ( 18.741 -121.31e3 273.5e6 -194.05e9 56.31e12 -5.8169e15 ); } ************************************************** **************************** Thanks omid20110 likes this.

February 4, 2018, 16:33
#2
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Join Date: Apr 2015
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Quote:
 Originally Posted by mgc Hi all, Could anyone tell me a book/paper/reference where to find the species polynomial coefficients required to calculate the absorptivity coefficient according to the "greyMeanAbsorptionEmission" model? In other words, does anybody know where following coefficients come from? ************************************************** **************************** CO2 { Tcommon 300; //Common Temp invTemp true; //Is the polynomio using inverse temperature. Tlow 200; //Low Temp Thigh 2500; //High Temp loTcoeffs //coefss for T < Tcommon ( 0 // a0 + 0 // a1*T + 0 // a2*T^(+/-)2 + 0 // a3*T^(+/-)3 + 0 // a4*T^(+/-)4 + 0 // a5*T^(+/-)5 + ); hiTcoeffs //coefss for T > Tcommon ( 18.741 -121.31e3 273.5e6 -194.05e9 56.31e12 -5.8169e15 ); } ************************************************** **************************** Thanks
Hello,
look at here:

February 25, 2022, 21:56
#3
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Yingdong
Join Date: Jan 2021
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Quote:
 Originally Posted by omid20110 Hello, look at here: http://www.sandia.gov/TNF/radiation.html
Unfortunately, the website has expired. Can you provide the latest website? I'm really looking forward to it

April 19, 2023, 03:52
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Join Date: Oct 2017
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Quote:
 Originally Posted by yingdong Unfortunately, the website has expired. Can you provide the latest website? I'm really looking forward to it
It probably won't help you anymore, but maybe it will help someone else.

An archived version of the website can be found here: https://web.archive.org/web/20180716...radiation.html
The model is also briefly described in "R. S. Barlow, A. N. Karpetis, J. H. Frank, and J. -Y. Chen. Scalar profiles and NO formation in laminar opposed-flow partially premixed methane/air flames. Combustion and Flame, 127, pp. 2102–2118, 2001." (https://doi.org/10.1016/S0010-2180(01)00313-3).