Calculation of the Thermodynamic Properties of Methane up to 30 MPa Using a New Equation of State with Regular and Scale Parts and Few Constants

Calculation of the Thermodynamic Properties of Methane up to 30 MPa Using a New Equation of State with Regular and Scale Parts and Few Constants Full article

Journal

High Temperature
ISSN: 0018-151X , E-ISSN: 1608-3156

Output data

Year: 2023, Volume: 61, Number: 3, Pages: 328 - 338 Pages count : 11 DOI: 10.1134/S0018151X23020037

Authors

Bezverkhii P.P. ¹ , Dutova O.S. ²

Affiliations

1	Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2	Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

The heat capacities Cv , Cp and speed of sound W of methane were calculated by a new equation of state with few adjustable constants. The equation includes a new regular part with 13 coefficients and a scale part with 6 coefficients with a regular crossover function containing two fitting parameters. The constants in the equation of state were determined using only (p, ρ, T) data for СH4; no data on Cv , Cp, and W were employed, except for the data on isochoric heat capacity Cv in the ideal-gas state and value of Cv at 100 K on the liquid branch on the liquid–vapor equilibrium curve. The calculated values of Cv, Cp, and W are close to the experimental and tabulated values in the regular region. Calculations in the critical region uses universal critical indices α, β, γ according to the three-dimensional Ising model. A discrepancy with the tabulated data is caused by application of the scaling equation of state. The calculated values are compared with the predictions by the known crossover equations of state for СH4. The root-mean-square error in the description of СH4 pressure is σр = 0.5%, the mean absolute deviation is 0.3%, the uncertainty in Cv does not exceed 5%.

Bezverkhii P.P. , Dutova O.S.
Calculation of the Thermodynamic Properties of Methane up to 30 MPa Using a New Equation of State with Regular and Scale Parts and Few Constants
High Temperature. 2023. V.61. N3. P.328 - 338. DOI: 10.1134/S0018151X23020037 WOS Scopus РИНЦ OpenAlex

Безверхий П.П. , Дутова О.С.
Расчет термодинамических свойств метана до 30 МПа по новому малоконстантному уравнению с регулярной и масштабной частями
Теплофизика Высоких Температур. 2023. Т.61. №3. С.358-369. DOI: 10.31857/S0040364423020035 РИНЦ OpenAlex

Submitted:	Jun 14, 2022
Accepted:	Oct 13, 2022
Published print:	Mar 7, 2024

Web of science:	WOS:001181400200002
Scopus:	2-s2.0-85187893254
Elibrary:	65107727
OpenAlex:	W4392680193

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