Summary
The change of states of a closed thermodynamic system having two degrees of freedom can be expressed analytically by means of the isentropic and the isenthalpic exponents, suitably defined. By imposing certain plausible conditions on these exponents, it can be shown that many well-known formulae, originally derived for an ideal gas with constant specific heat, become applicable more generally. Low pressure wet steam of not too low dryness fraction as occurred in the low-pressure stages of condensing turbines obeys these imposed conditions fairly well.
The problem of supersaturation and of the drift toward equilibrium has been briefly touched upon.
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Dzung, L.S. Thermostatische Zustandsänderungen des trockenen und des nassen Dampfes. Journal of Applied Mathematics and Physics (ZAMP) 6, 207–223 (1955). https://doi.org/10.1007/BF01600639
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DOI: https://doi.org/10.1007/BF01600639