Radiation of gases

[Koarle]

Hello,

I am modelling radiation of a combustion reaction in an industrial furnace. The flame contains besides regular gas species (CO, CO2, H2O, N2,...) also a lot of ash (mainly Zinc oxide) and other more exotic gas species (Zn(g), PbO(g!!)). The temperatures of the flame are around 1600 °C.

I have the following questions about this problem:
-Will N2 radiate at these temperatures, or is it a good approximation to neglect the contribution of this? (where can I find a good reference on this?)
-How can I estimate radiation behavior of PbO(g) and calculate its Planck mean absorption coefficient? I guess I can estimate the eigenfrequency of the molecule if I think of it as a spring, but how do I proceed then to calculate the Planck mean aborption coefficient?

Any help on one of these questions would be highly welcome.

Best regards,

Karel Verscheure

 

[davefitz]

Karel,

Try the text books by Siegel and Howell ( "Thermal radiation heat transfer" based on NASA research) and by Mike Modest ( Penn State University)"radiative heat trasfer".

 

[Koarle]

Hello Davefitz,

I have the book of Michael Modest but this doesn't solve my problem: how can I estimate how much this PbO will radiate? I think I would be able to calculate the eigenfrequency of the molecule if I would know the spring constant, but how do I estimate the spring constant??
If I know the eigenfrequency of the molecule, how do I proceed then to calculate the Planck mean absorption coefficient k_p of the PbO gas?

Thanks in advance for your kind help,

Karel