Nonanalytical unified equation of state of freezant R23

We have set a task to develop a system of self-consistent models in the article. The first and the second models let us describe the liquid density and the gas density on the saturation line; the third one is connected with the saturation pressure. To build these models, we have used a methodical approach based on the Clapeyron-Clausius equation. The approach also includes some requirements of the scaling theory of critical phenomena. To calculate the adjustable coefficients of these models, experimental data on the liquid density, the gas density and the saturated pressure of SF6 have been selected. The new system let us describe the named properties in a wide interval of temperature. A comparative study has been made for these calculated properties as well as for the mean diameter of the coexistence curve. Numerical results of the study are discussed.

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

Рыков

Kudryavtseva

Рыков

2019

J. Phys.: Conf. Ser.

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Here, the authors discuss the problem of describing the equilibrium properties of a substance in the vicinity of the critical point on the basis of the fundamental equation of state (FEoS) of a liquid and a gas in the absence of experimental information about the calorific properties of a given substance in this field of state parameters. FEoS has the following characteristics: in the region of low densities, FEoS transforms to the virial equation of state; in the asymptotic vicinity of the critical point, FEoS meets the requirements of the scaling theory of critical phenomena. The method is based on a new representation of the scaling hypothesis based on the Scofield–Litster–Ho linear model (LM), the Benedek hypothesis and the Lysenkov–Rykov ratio (LR) which establishes the relationship between LM parameters and the real liquid using the Pokrovsky transformations. Testing of the proposed method for constructing FEoS has been carried out using the example of describing the equilibrium properties of argon. It has been ascertained that the use of the LR ratio has allowed, firstly, reducing the number of individual FEoS parameters and, secondly, excluding the data about isochoric heat capacity CV related to the critical point wide vicinity from the calculation scheme.

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Nonanalytical unified equation of state of freezant R23

Cited by 5 publications

References 3 publications

Methods for calculating equilibrium properties of pure substances, considering the critical point features

Methods for calculating equilibrium properties of pure substances, considering the critical point features

A model system of the liquid density, the gas density and the pressure on the saturation line of SF₆

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

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Nonanalytical unified equation of state of freezant R23

Cited by 5 publications

References 3 publications

Methods for calculating equilibrium properties of pure substances, considering the critical point features

Methods for calculating equilibrium properties of pure substances, considering the critical point features

A model system of the liquid density, the gas density and the pressure on the saturation line of SF6

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

Contact Info

Product

Resources

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A model system of the liquid density, the gas density and the pressure on the saturation line of SF₆