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Ushcats M.V.,National University of Shipbuilding
Physical Review Letters | Year: 2012

The well-known problem of the virial expansion low-density limitation is considered within Mayer's cluster expansion method. The expression for the configuration integral and the corresponding equation of state are presented based on this approach but not limited by the convergence radius of the series for density and activity. When taking into account any number of irreducible integrals at the thermodynamic limit, this equation of state demonstrates the exact coincidence with the virial one inside the domain of its convergence but specifies the condensation process directly outside that domain. Thus, the assumption of some researchers that the condensation should appear in the domain where the proof of the virial expansion is limited may now be regarded as confirmed, exclusively using the classical Gibbs statistics. © 2012 American Physical Society.


Matveev I.B.,Applied Plasma Technologies | Serbin S.I.,National University of Shipbuilding
IEEE Transactions on Plasma Science | Year: 2010

Theoretical and experimental investigations of the working processes in a plasma-assisted combustion and reformation system have been conducted. The selected concept can provide higher performance, wider turndown ratios, more efficient propellant utilization, demonstration of potential fuel flexibility, and satisfaction of major gravimetric and volumetric density requirements. Obtained results and recommendations can be used for hybrid-type plasma-assisted system operation modes, including modeling, geometry optimization, prospective propulsion, and power-generation unit designs and engineering. © 2006 IEEE.


Serbin S.I.,National University of Shipbuilding | Matveev I.B.,Applied Plasma Technology
IEEE Transactions on Plasma Science | Year: 2010

Theoretical investigations of the working processes in a plasma coal pilot gasification system have been conducted. The obtained results and recommendations can be used for modeling the operational modes of plasma gasification system, as well as geometry optimization, and the engineering design of prospective power generation units. © 2006 IEEE.


Ushcats M.V.,National University of Shipbuilding
Journal of Chemical Physics | Year: 2013

An accurate expression for the cluster expansion of the configuration integral has been considered based on the Gibbs single-phase approach without additional assumptions and approximations. The computational results for the Lennard-Jones fluid demonstrate the beginning of the condensation process at the singularity points of the isothermal compressibility. It has also been shown that the accuracy boundary of the virial equation of state corresponds to these points, not the virial series singularities. At the high density regime, the inappropriate behavior of the cluster expansion has been discovered that may be related to the infinite limits of the cluster integrals, i.e., their independency on the density. © 2013 American Institute of Physics.


Ushcats M.V.,National University of Shipbuilding
Journal of Chemical Physics | Year: 2014

The modified Lennard-Jones potential, which simplifies the numerical simulations and maintains the realistic behavior of its parent, is proposed to a role of the standard interaction model for both the experimental and theoretical studies. The virial coefficients of this model up to the seventh order have been calculated for the range of temperatures kT/E = 0.3-70. In the computations, a technique has been used, that combines the quadrature integration and Mayer Sampling Monte Carlo method (MSMC). Unlike the original MSMC, this technique does not require the reference coefficients of another potential and can be used in a wide range of temperatures for various interaction models. © 2014 AIP Publishing LLC.

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