scholarly journals Method for constructing fundamental equation of state that satisfies the scaling theory and applicable for substances insufficiently explored in the critical point vicinity

2019 ◽  
Vol 1385 ◽  
pp. 012014
Author(s):  
S V Rykov ◽  
I V Kudryavtseva ◽  
V A Rykov
Keyword(s):  
Equation Of State ◽  
Critical Point ◽  
Fundamental Equation ◽  
Scaling Theory ◽  
Fundamental Equation Of State

scholarly journals Method for constructing the fundamental equation of state that takes into account the peculiarities of the substance behaviour in a wide vicinity of the critical point

2021 ◽  
Vol 2057 (1) ◽  
pp. 012112
Author(s):  
S V Rykov ◽  
I V Kudryavtseva
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Equation Of State ◽  
Critical Point ◽  
Fundamental Equation ◽  
Virial Coefficients ◽  
Phenomenological Theory ◽  
Phase Region ◽  
Scale Functions ◽  
Fundamental Equation Of State

Abstract On the basis of the phenomenological theory of the critical point and the Benedek hypothesis, an expression for the Helmholtz free energy F with scale functions in the density-temperature variables has been developed. The proposed free energy equation has been tested on the example of constructing the fundamental equation of state of 2,3,3,3-tetrafluoropropene (R1234yf). By comparison with the known experimental data on the equilibrium properties of R1234yf – density and pressure on the phase equilibrium line, p-ρ-T-data in the single-phase region, the second and third virial coefficients, isochoric heat capacity, isobaric heat capacity and the sound velocity – the operating range of the equation of state of R1234yf has been established according to temperature from 220 K to 420 K and pressure up to 20 MPa.

Speed-of-Sound Measurements and a Fundamental Equation of State for Propylene Glycol

2021 ◽  
Vol 50 (2) ◽  
pp. 023105
Author(s):  
Tim Eisenbach ◽  
Christian Scholz ◽  
Roland Span ◽  
Diego Cristancho ◽  
Eric W. Lemmon ◽  
...  
Keyword(s):  
Equation Of State ◽  
Propylene Glycol ◽  
Speed Of Sound ◽  
Fundamental Equation ◽  
Fundamental Equation Of State

Fundamental Equation of State for Deuterium

2014 ◽  
Vol 43 (1) ◽  
pp. 013103 ◽  
Author(s):  
I. A. Richardson ◽  
J. W. Leachman ◽  
E. W. Lemmon
Keyword(s):  
Equation Of State ◽  
Fundamental Equation ◽  
Fundamental Equation Of State

A Fundamental Equation of State for Ethanol

2014 ◽  
Vol 43 (4) ◽  
pp. 043102 ◽  
Author(s):  
J. A. Schroeder ◽  
S. G. Penoncello ◽  
J. S. Schroeder
Keyword(s):  
Equation Of State ◽  
Fundamental Equation ◽  
Fundamental Equation Of State
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