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56. Eucken correction in high-temperature gases with electronic excitation.

Author

Istomin, V. A., Kustova, E. V., and Mekhonoshina, M. A.

Subjects
*KINETIC theory of gases, *HIGH temperatures, *ELECTRONIC excitation, *ALGORITHMS, *THERMAL conductivity, *COLLISION phenomena (Physics)
Abstract

In the present paper, thermal conductivity coefficient of high-temperature molecular and atomic gases with excited electronic states is studied using both the kinetic theory algorithm developed by authors earlier and the well known simple expression for the thermal conductivity coefficient proposed by Eucken and generalized by Hirschfelder. The influence of large collision diameters of excited states on the thermal conductivity is discussed. The limit of validity of the Eucken correction is evaluated on the basis of the kinetic theory calculations; an improved model suitable for air species under high-temperature conditions is proposed. [ABSTRACT FROM AUTHOR]

Published
2014
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61. Mapping the Output of Topical Searches in the Web of Knowledge and the Case of Watson-Crick.

Author

Garfield, Eugene, Pudovkin, A. I., and Istomin, V. S.

Subjects
CHRONOLOGY, BIBLIOGRAPHIC databases, MAPS, HISTORIOGRAPHY, AUTHORSHIP, ONLINE information services
Abstract

HistCite™ is a system that generates chronological maps of subject (topical) collections resulting from searches of the Institute for Scientific Information Web of Science (WoS) or Science Citation Index, Social Sciences Citation Index, and Arts and Humanities Citation Index on CD-ROM. WoS export files are created in which all cited references for source documents are captured. These bibliographic collections are processed by HistCite, which generates chronological tables as well as historiographs that highlight the most-cited works in and outside the collection. Articles citing the 1953 primordial Watson-Crick paper on the structure of DNA will be used as a demonstration. Real-time dynamic genealogical historiographs will be shown. HistCite also includes a module for detecting and editing errors or variations in cited references. Export Files of five thousand or more records are processed in minutes on a PC. Ideally the system will be used to help the searcher quickly identify the most significant work on a topic and enable the searcher to trace its year-by-year historical development. [ABSTRACT FROM AUTHOR]

Published
2003

68. Increasing the Efficiency of Hydrocarbons С5+ Extraction from the Gas of Condensate Fields by a Low-Temperature Absorption Process.

Author

Prokopov, A. V., Istomin, V. A., Fedulov, D. M., and Dedov, A. G.

Subjects
GAS fields, GAS condensate reservoirs, GAS extraction, HYDROCARBONS, ABSORPTION, PETROLEUM chemicals
Abstract

Absorption extraction of C5+ hydrocarbons from formation gas of gas-condensate fields at the level of temperature of from –25 to –30°C was simulated. The following conditions were recommended during realization: absorbent by physical-chemical characteristics corresponding to hydrocarbons С9/С10, four theoretical contact stages in the absorber, and partial expenditure of absorbent of 20–30 g/m3. Techniques of low-temperature absorption and low-temperature separation were compared. Parameters were determined that allow developing a scheme of a process with the increased degree of extraction of hydrocarbons С5+ (over 99%), which are valuable petrochemical materials. [ABSTRACT FROM AUTHOR]

Published
2019
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86. Effect of Electronic Excitation on High-Temperature Flows of Ionized Nitrogen and Oxygen Mixtures behind Strong Shock Waves.

Author

Istomin, V. A. and Kustova, E. V.

Subjects
*NITROGEN, *NONEQUILIBRIUM flow, *HIGH temperature physics, *GAS mixtures, *SHOCK waves, *ELECTRONIC excitation
Abstract

Strongly non-equilibrium flows of reacting five-component ionized mixtures of nitrogen (N2/N2+ /N/N+/e-) and oxygen (O2/O2+ /O/O+/e-) behind the plane shock wave are studied taking into account electronic degrees of freedom of both neutral and ionized species. The kinetic scheme includes non-equilibrium reactions of ionization, dissociation, recombination and chargetransfer. Two test cases corresponding to the spacecraft re-entry (Hermes and Fire II experiments) are considered; fluid-dynamic variables, transport coefficients and heat flux are calculated, and different contribution to the heat flux are analyzed. The effect of electronic excitation on the heat transfer is governed by the competition of diffusion and heat conduction; it becomes weak if diffusive processes prevail. An important role of thermal diffusion in ionized flows is emphasized. The influence of dissociation rates on the heat flux is assessed. [ABSTRACT FROM AUTHOR]

Published
2016
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87. State-to-State Kinetics and Transport Properties of Electronically Excited N and O Atoms.

Author

Istomin, V. A. and Kustova, E. V.

Subjects
*NITROGEN, *KINETIC theory of gases, *EXCITED states, *COLLISIONS (Physics), *TRANSPORT theory, *FLUORESCENCE resonance energy transfer
Abstract

A theoretical model of transport properties in electronically excited atomic gases in the state-to-state approach is developed. Different models for the collision diameters of atoms in excited states are discussed, and it is shown that the Slater-like models can be applied for the state-resolved transport coefficient calculations. The influence of collision diameters of N and O atoms with electronic degrees of freedom on the transport properties is evaluated. Different distributions on the electronic energy are considered for the calculation of transport coefficients. For the Boltzmann-like distributions at temperatures greater than 15000 K, an important effect of electronic excitation on the thermal conductivity and viscosity coefficients is found; the coefficients decrease significantly when many electronic states are taken into account. It is shown that under hypersonic reentry conditions the impact of collision diameters on the transport properties is not really important since the populations of high levels behind the shock waves are low. [ABSTRACT FROM AUTHOR]

Published
2016
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88. Theoretical investigations into the dynamics of compact pneumatic frontal loaders under self-induced vibrations

Author

Nazarov, L., Istomin, V., Ovsyannikov, S., Razaryonov, L., Gingera, A., and Lesthenko, А.

Subjects
Computer Science::Computational Engineering, Finance, and Science, Physics::Chemical Physics, автоколивання, динаміка, навантажувач, частота, амплітуда, навантаження, демпфер
Abstract

A system of nonlinear differential equalizations of motion of compact frontal loaders under self-induced vibrations has been solved the effect of some parameters of loaders on the parameters of their self-induced vibrations has been analyzed

Published
2007

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