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The three isentropic exponents of wet steam

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Abstract

Real gas isentropic changes may be described using the three well known ideal gas relations,pv k=const, p(1−k)Tk=const andTv k-1=const, where exponent k has for each equation a different value kp, ν, kp, T and kT, ν respectively. In this paper the three isentropic exponents theory for real gases is extended to the two phase region. As an application the numerical values of the three exponents are calculated for wet steam.

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Abbreviations

c p :

specific heat capacity at constant pressure

c p :

specific heat capacity at constant volume

h :

specific enthalpy

k :

isentropic exponent

p :

pressure

Q :

data fitting function

R :

gas constant

r :

specific enthalpy of vaporization

s :

specific entropy

T :

temperature

v :

specific volume

x :

vapour quality

ρ:

density

τ:

temperature parameter, τ=1000/T

Ψ:

Helmholtz free energy

References

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Authors and Affiliations

  1. Mechanical Engineering Department, Thermal Engineering Section, National Technical University, 42 Patission Street, 10682, Athens, Greece

    Iordanis Paradissiadis

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  1. Iordanis Paradissiadis
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Paradissiadis, I. The three isentropic exponents of wet steam. Forsch Ing-Wes 53, 159–161 (1987). https://doi.org/10.1007/BF02560949

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  • DOI: https://doi.org/10.1007/BF02560949

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