Thermal Conductivity of gas mixture
Thermal Conductivity of gas mixture
(OP)
Hi, can someone direct me to a book, or website, whcih can show me how to calculate thermal conductivity and dynamic viscosity of mixture of gases?
My mixture consists of: Hydrogen, Nitrogen, Carbon monoxyde, Carbon Dyoxide, Methane and water vapor...
I need formula to calculate thermal conductivity, and viscosity..
Thank you for help in advance.
My mixture consists of: Hydrogen, Nitrogen, Carbon monoxyde, Carbon Dyoxide, Methane and water vapor...
I need formula to calculate thermal conductivity, and viscosity..
Thank you for help in advance.





RE: Thermal Conductivity of gas mixture
There are procedures in the TEMA (Tubular Exchanger Manufacturers Association) book for calculating the properties of mixed gases. However, you need the individual properties to do it.
Regards,
speco
RE: Thermal Conductivity of gas mixture
http://webbook.nist.gov/chemistry/fluid/
But I'd recommend paying the $200 or $300 for the REFPROP database instead. It'll pay for itself very quickly if you do much thermo work.
http://www.nist.gov/srd/nist23.htm
RE: Thermal Conductivity of gas mixture
In short, if you don't need a detailed discussion and references, this is what they suggest for gas mixtures at low pressures.
-thermal conductivity k=Σyiki(Mi)1/3/Σyi(Mi)1/3
-viscosity μ=Σyiμi(Mi)1/2/Σyi(Mi)1/2
where y is the mole fraction and M the molecular weight.
prex
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RE: Thermal Conductivity of gas mixture
thank you very much...And can you tell me, for water vapor, I need cp, thermal conductivity etc...On the net, I have only found values for 1 bar, and I have 21 bar at 210deg celsius?
Is it possible to find somewhere these values, or these values are available only for 1 bar?
RE: Thermal Conductivity of gas mixture
Pay a visit to the site suggested by iainuts. You"ll find that water at 210oC and 21 bar is a liquid.
RE: Thermal Conductivity of gas mixture
RE: Thermal Conductivity of gas mixture
The Change of phase case involves absorbtion of(Latent)heat when boiling starts around atmospheric pressure.
Hope this is helping
Best Regards
Qalander(Chem)
RE: Thermal Conductivity of gas mixture
At 21 bar and 215oC, the vapor Cp = 3.23 kJ/(kg.K), from the NIST table.