Simple fundamental equation of state for liquid, gas, and fluid of argon, nitrogen, and carbon dioxide
A.B. Kaplun and A.B.
Meshalkin
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
E-mail: kaplun@itp.nsc.ru
Keywords: fundamental equation, compressibility factor, temperature, pressure, density, enthalpy, heat capacity, sound velocity
Pages: 513–522
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 ac-curacy 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.
DOI: 10.1134/S0869864317040023
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