Equilibrium structure of dense gases

Sedunov, Boris

doi:10.1051/matecconf/20130301002

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…Now we consider the structure of the free moving particles density Dp = P / RT. The free moving particles are monomers [14,15], clusters [17,18] and the arising at collisions temoparily existing complexes of monomers and clusters, which do not result in the clusters formation. These complexes may be named as virtual clusters [15], Figure 4.…”

Section: The Apparent Equilibrium Constants For Nparticle Complexesmentioning

confidence: 99%

An Advanced Platform for Thermodynamics Education. Part one: Small Density Pure Real Gases

Sedunov

2020

International Journal of Thermodynamics

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The paper presents an advanced platform for thermodynamics education-the equilibrium pure real gas system, which has been deeply investigated experimentally and theoretically by researchers from all over the World. But in spite of a huge amount of extra precise experimental data, the nature of real gases and clusters in them is still poorly understood. The clusters are considered now as a new state of matter. To study them is both challenging and educative. We use a wonderful feature of pure real gases: the chemical potential for all basic particles in a gas is universal for all clusters. It permits us to find the monomer fraction density Dm from an experimental pressure dependence of the total density. This variable has proven to be the key to properties of clusters and molecular interactions. The advanced platform is more informative for thermodynamics education than the widely used ideal gas model, which ignores molecular interactions. It provides a new vision of molecular interactions in clusters and the entropy in pure real gases. Moving step-by-step from ideal to denser gases students may better understand the complex nature of condensation. Here we start from small density gases.

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Section: The Apparent Equilibrium Constants For Nparticle Complexesmentioning

confidence: 99%

An Advanced Platform for Thermodynamics Education. Part one: Small Density Pure Real Gases

Sedunov

2020

International Journal of Thermodynamics

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“…It means that at low temperatures intermolecular bonds are much more oriented. The smooth fall of the E n (T) dependence was called by the author as the Soft Structural Transition in clusters [11]- [13]. It is the transition from a solid-like cluster structure at low T to the liquid-like structure at elevated temperatures.…”

Section: Soft Structural Transition In Cluster Fractionsmentioning

confidence: 99%

“…The method uses series expansion of precise thermophysical functions by the monomer fraction density [10]. The developed method helps to discover unknown properties of clusters and molecular interactions in molecular [11] and atomic [12] gases and in supercritical fluids [13]- [16]. In this paper we pay attention to polar gases, such as the water and methanol vapors, which at low temperatures possess tetramers with giant bond energies and strong orientation of hydrogen bonds.…”

Section: Introductionmentioning

confidence: 99%

Clusters—The Seeds of Droplets and Snowflakes

Sedunov¹

2015

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The clusters play a significant role in formation of Universe, in the condensation of matter and meteorological phenomena, in processes of life, and in our technologies. Therefore, they should be studied better. Modern electronic thermophysical databases are very rich sources of knowledge about cluster properties. This research is directed towards development and perfection of methods to extract properties of clusters from precise thermophysical data. The parallel between clusters, droplets and snowflakes helps in this investigation. The paper shows the achievements and discoveries on this way. The soft structural transition in cluster fractions is opposed to the abrupt phase transition at a condensation of matter.

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“…A large role of clusters in SF technologies and analytics was described in works [30] [31]. The step-by-step movement from dilute gases to supercritical fluids discovers the chain clusters [32], which contribution to potential energy of a gas may be extrapolated to large densities, thus permitting to analyze the large 3D clusters [16] [17] [33]. This paper demonstrates the mass spectrum of large 3D clusters in the near critical zone of Carbon Dioxide.…”

Section: Introductionmentioning

confidence: 97%

Analytical Approach to Clusters in near Critical CO<sub>2</sub>

Sedunov¹,

Brondz²

2016

IJAMSC

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Clusters greatly influence thermophysical properties of near critical gases. The cluster structures of supercritical fluids in general and Carbon Dioxide especially are important for the advanced supercritical fluid technologies and analytics development. The paper extends to near critical densities the developed earlier methods to extract the clusters' properties from Online Electronic Database of NIST on thermophysical properties of fluids. This Database contains a hidden knowledge of cluster fractions' properties in real gases. The discovered earlier linear chain clusters dominate at intermediate densities. Their properties can be extrapolated to high density gases, thus opening the way to study large 3D clusters in near critical zone. The potential energy density of a gas, cleared from the chain clusters' contribution, reflects only the 3D clusters' characteristics. A series expansion of this value by the Monomer Fraction density discovers properties of n-particle 3D clusters. The paper demonstrates a discrete row of 3D clusters' particle numbers and gives estimations for bond energies of these clusters.

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Equilibrium structure of dense gases

Cited by 5 publications

References 14 publications

An Advanced Platform for Thermodynamics Education. Part one: Small Density Pure Real Gases

An Advanced Platform for Thermodynamics Education. Part one: Small Density Pure Real Gases

Clusters—The Seeds of Droplets and Snowflakes

Analytical Approach to Clusters in near Critical CO<sub>2</sub>

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Equilibrium structure of dense gases

Cited by 5 publications

References 14 publications

An Advanced Platform for Thermodynamics Education. Part one: Small Density Pure Real Gases

An Advanced Platform for Thermodynamics Education. Part one: Small Density Pure Real Gases

Clusters—The Seeds of Droplets and Snowflakes

Analytical Approach to Clusters in near Critical CO&lt;sub&gt;2&lt;/sub&gt;

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Analytical Approach to Clusters in near Critical CO<sub>2</sub>