An International Standard Equation of State for Difluoromethane (R-32) for Temperatures from the Triple Point at 136.34 K to 435 K and Pressures up to 70 MPa

1997 ◽  
Vol 26 (6) ◽  
pp. 1273-1328 ◽  
Author(s):  
Reiner Tillner-Roth ◽  
Akimichi Yokozeki
Keyword(s):  
Equation Of State ◽  
Triple Point ◽  
International Standard ◽  
Standard Equation

scholarly journals LOW-TEMPERATURE EQUATION OF STATE OF SOLID METHANE

2016 ◽  
Vol 52 (1) ◽  
Author(s):  
L. N. Yakub ◽  
O. S. Bodiul
Keyword(s):  
Perturbation Theory ◽  
Equation Of State ◽  
Low Temperature ◽  
Thermodynamic Properties ◽  
Triple Point ◽  
Order Approximation ◽  
Zero Order ◽  
Zero Order Approximation ◽  
Temperature Equation ◽  
Solid Methane

The theoretical equation of state for solid methane, developed within the framework of perturbation theory, with the crystal consisting of spherical molecules as zero-order approximation, and octupole – octupole interaction of methane molecules as a perturbation, is proposed. Thermodynamic functions are computed on the sublimation line up to the triple point. The contribution of the octupole – octupole interaction to the thermodynamic properties of solid methane is estimated.

scholarly journals Equation of state to predict the solid-liquid-vapor phase coexistances of pure substances.

2020 ◽  
Vol 66 (5 Sept-Oct) ◽  
pp. 656
Author(s):  
J. M. Marín-García ◽  
A. Romero-Martínez ◽  
F. De J. Guevara-Rodríguez
Keyword(s):  
Equation Of State ◽  
Triple Point ◽  
Input Data ◽  
Acentric Factor ◽  
Point Temperature ◽  
Cubic Equation ◽  
Pure Substances ◽  
Solid Liquid ◽  
Triple Point Temperature ◽  
Liquid Vapor

A non-cubic equation of state is used to predict the solid-liquid, solid-vapor and liquid-vapor coexistences of pure substances. The equation of state is obtained using as input data the critical point, the boiling temperature, the triple point temperature and the acentric factor of the substance. In this work, some examples of phase diagrams predicted with the equation of state are reported in order to show its capabilities. Finally, a database with the parameters for different pure substances is presented.

THERMAL AND CALORIC EQUATIONS OF STATE FOR NITROGEN: APPLICATION TO CRYOGENIC INJECTION CONDITIONS

2020 ◽  
Author(s):  
N. M. KUZNETSOV ◽  
◽  
S. N. MEDVEDEV ◽  
S. M. FROLOV ◽  
F. S. FROLOV ◽  
...  
Keyword(s):  
Equation Of State ◽  
Triple Point ◽  
Equations Of State ◽  
Applicability Domain ◽  
Analytical Equation ◽  
Nitrogen Application ◽  
Real Gas ◽  
The Real ◽  
Turbulent Reactive Flows ◽  
Wide Range

The real-gas analytical equation of state (EoS) for nitrogen is developed. The applicability domain of the EoS is verified in a wide range of density (from 0 to the value at the triple point, 0.867 g/cm3) and temperature (from 100 to 5000 K). The obtained EoS is introduced into the gasdynamic code for calculating multidimensional turbulent reactive flows.

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