Simple fundamental equation of state for liquid, gas, and fluid of argon, nitrogen, and carbon dioxide
- Authors: Kaplun A.B.1, Meshalkin A.B.1
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Affiliations:
- Kutateladze Institute of Thermophysics SB RAS
- Issue: Vol 24, No 4 (2017)
- Pages: 513-522
- Section: Article
- URL: https://journals.rcsi.science/1531-8699/article/view/217004
- DOI: https://doi.org/10.1134/S0869864317040023
- ID: 217004
Cite item
Abstract
A new fundamental low-parametric equation of state in the form of reduced Helmholtz function for describing thermodynamic properties of normal substances was obtained using the methods and approaches developed earlier by the authors. It allows us to describe the thermal properties of gas, liquid, and fluid in the range from the density in ideal-gas state to the density at a triple point (except the critical region) with sufficiently high accuracy close to the accuracy of experiment. The caloric properties and sound velocity of argon, nitrogen, and carbon dioxide are calculated without involving any caloric data, except the ideal gas enthalpy. The obtained values of isochoric heat capacity, sound velocity, and other thermodynamic properties are in good agreement with experimental (reliable tabular) data.
About the authors
A. B. Kaplun
Kutateladze Institute of Thermophysics SB RAS
Author for correspondence.
Email: kaplun@itp.nsc.ru
Russian Federation, Novosibirsk
A. B. Meshalkin
Kutateladze Institute of Thermophysics SB RAS
Email: kaplun@itp.nsc.ru
Russian Federation, Novosibirsk