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I am looking for an analytical correlation of the thermal conductivity of water vapour (steam) in function of pressure. Apparently the effect is not large, but I would like to confirm this by some correlations.

The only thing I found so far is this plot from The Engineering Toolbox. Unfortunately, no sources/references are given.

Thanks!

Thermal conductivity

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Bird, Stewart, and Lightfoot, Transport Phenomena, Chapter 9 presents molecular derivation of pure species thermal conductivity as a function of temperature and pressure, and, in Section 9.2 presents a Corresponding States plot of reduced thermal conductivity as a function of reduced temperature and reduced pressure. At low pressures, all the curves converge to a limiting curve that is a function only of reduced temperature.

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You could check out the International Association for the Properties of Water and Steam who provide guidelines for the experimental determination, as well as semi-empirical formulations of the properties that you're interested in. Their formulations have been coded up by several sources including the NIST (FORTRAN, non-free) and this rather cool version in python.

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