Центральная Научная Библиотека УрО РАН

Вид документа : Статья из журнала
Шифр издания : 53/S 94
Автор(ы) : Baidakov V. G., Kaverin A. M., Khotienkova M. N., Andbaeva V. N.
Заглавие : Surface tension of an ethane–nitrogen solution. 1: Experiment and thermodynamic analysis of the results
Место публикации : Fluid Phase Equilibria. - 2012. - Vol.328. - С. 13-20
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): surface tension--capillary constant--ethane–nitrogen solution
Аннотация: The differential variation of the method of capillary rise has been employed to measure the capillary constant and calculate the surface tension of ethane–nitrogen solutions. Experiments have been conducted in the temperature range from 93.15 K to 283.15 K at pressures up to 4 MPa. The (p, T)-projection of the line of three-phase liquid–liquid–vapor equilibrium and the surface tension at a liquid–vapor interface close to this line have been determined. Equations are developed which describe the dependence of the capillary constant and the surface tension on the temperature, pressure, and composition of the liquid phase. Experimental data on the surface tension are analyzed in the framework of thermodynamic m
\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2012, v.328, p. 13-20.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/S 61
Автор(ы) : Boltachev G. Sh., Volkov N.V., Dobrov S. V., Ivanov V. V., Nozdrin A. A., Paranin S. N.
Заглавие : Simulation of radial pulsed magnetic compaction of a granulated medium in a quasi-static approximation
Место публикации : Technical Physics. - 2007. - Vol. 52, № 10. - С. 1306-1315
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): magnetic compaction
Аннотация: Compression adiabats for alumina-based nanopowders are obtained experimentally, various conditions of pulsed magnetic cylindrically symmetric radial compaction of the nanopowders are tested, and the density distribution in the compacted powders are measured. Using the compression adiabats obtained, quasi-static compaction of a granulated (porous) medium, which is considered to be compact, is simulated. The conditions of uniform and equilibrium compaction on a rigid rod are analyzed. The voidage distribution, stress tensor, and amount of accumulated deformation are calculated. The features of nanopowder compaction, specifically, the presence (absence) of voidage nonuniform radial distribution, are explained.
\\\\Expert2\\NBO\\Technical Physics\\2007, v.52, N 10, p.1306.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/S 34
Автор(ы) : Schmelzer J. W. P., Boltachev G. Sh., Baidakov V. G.
Заглавие : Classical and generalized Gibbs' approaches and the work of critical cluster formation in nucleation theory
Место публикации : Journal of Chemical Physics. - 2006. - Vol. 124, № 19. - С. 194503/1-194503/18
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): clusters
Аннотация: In the theoretical interpretation of the kinetics of first-order phase transitions, thermodynamic concepts developed long ago by Gibbs are widely employed giving some basic qualitative insights into these processes. However, from a quantitative point of view, the results of such analysis, based on the classical Gibbs approach and involving in addition the capillarity approximation, are often not satisfactory. Some progress can be reached here by the van der Waals and more advanced density functional methods of description of thermodynamically heterogeneous systems having, however, its limitations in application to the interpretation of experimental data as well. Moreover, both mentioned theories—Gibbs’ and density functional approaches—lead to partly contradicting each other’s results. As shown in preceding papers, by generalizing Gibbs’ approach, existing deficiencies and internal contradictions of these two well-established theories can be removed and a new generally applicable tool for the interpretation of phase formation processes can be developed. In the present analysis, a comparative analysis of the basic assumptions and predictions of the classical and the generalized Gibbs approaches is given. It is shown, in particular, that—interpreted in terms of the generalized Gibbs approach—the critical cluster as determined via the classical Gibbs approach corresponds not to a saddle but to a ridge point of the appropriate thermodynamic potential hypersurface. By this reason, the classical Gibbs approach (involving the classical capillarity approximation) overestimates as a rule the work of critical cluster formation in nucleation theory and, in general, considerably.
\\\\Expert2\\NBO\\Journal of Chemical Physics\\2006, v.124, p.194503.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/M 61
Автор(ы) : Baidakov V. G., Protsenko S.P., Kozlova Z. R., Chernykh G. G.
Заглавие : Metastable extension of the liquid-vapor phase equilibrium curve and surface tension
Место публикации : Journal of Chemical Physics. - 2007. - Vol. 126, № 21. - С. 214505/1-214505/9
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): liquid
Аннотация: The method of molecular dynamics has been used to calculate the parameters of liquid-vapor phase equilibrium and the surface tension in a two-phase system of 4096 Lennard-Jones particles. Calculations have been made in a range from the triple point to near-critical temperature and also at temperatures below the triple point corresponding to the metastable equilibrium of a supercooled liquid and supersaturated vapor. To determine the surface tension, along with a mechanical approach a thermodynamic one has been used as well. The latter was based on calculation of the excess internal energy of an interfacial layer. It has been shown that in accuracy the thermodynamic approach is as good as the more sophisticated mechanical one. Low-temperature asymptotics of the phase-equilibrium curve and also of liquid and vapor spinodals have been considered in the Lennard-Jones and the van der Waals models. The behavior of the surface tension and the excess internal energy of an interfacial layer at T0 is discussed.
\\\\Expert2\\NBO\\Journal of Chemical Physics\\2007, v.126, p.214505.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/C 91
Автор(ы) : Baidakov V. G., Tipeev A. O., Bobrov K. S., Ionov G. V.
Заглавие : Crystal nucleation rate isotherms in lennard-jones liquids
Место публикации : Journal of Chemical Physics. - 2010. - Vol.132, №23. - С. 234505
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): molecular-dynamics simulation--lennard-jones fluid--nucleus-liquid interface
Аннотация: We present the results of molecular dynamics simulations of the crystal nucleation rate in a supercooled Lennard-Jones liquid. The nucleation rate as a function of the pressure has been calculated by the method of determining the expectation time for liquid crystallization at temperatures higher than that of the triple point (T∗ = 0.865), close to the temperature of the terminal critical point of the metastable extension of the melting curve (T∗ = 0.55) and below this temperature (T∗ = 0.4). In computer experiments the nucleation rate varied from 1032 to 1035 s−1 m−3. The dimensions of critical nuclei and the pressure inside them, the surface free energy at a critical crystal nucleus-liquid interface, the height of the nucleation barrier, and the Zeldovich factor have been determined from the results of molecular dynamics simulations and their comparison with classical homogeneous nucleation theory. It is shown that the surface free energy at a curved crystal-liquid interface, as distinct from a flat interface, has also been determined at temperatures lower than the temperature of the terminal critical point of the melting curve and is a monotonically increasing function of the temperature
\\\\Expert2\\nbo\\Journal of Chemical Physics\\2010, v.132, p. 234505.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/C 74
Автор(ы) : Protsenko S.P., Baidakov V. G., Teterin A.S., Zhdanov E.R.
Заглавие : Computer simulation of nucleation in a gas-saturated liquid
Место публикации : Journal of Chemical Physics. - 2007. - Vol. 126, № 9. - С. 094502/1-094502/14
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): liquid
Аннотация: Molecular dynamics methods have been used to investigate the kinetics of the liquid-gas phase transition in a two-component Lennard-Jones system at negative pressures and elastic stretches of the liquid to values close to spinodal ones. The molecular dynamics system consists of 2048 interacting particles with parameters of the Lennard-Jones potential for argon and neon. Density dependences of pressure and internal energy have been calculated for stable and metastable states of the mixture at a temperature Tsup*/sup?0.7±0.01 and three values of the concentration. The location of mechanical and the diffusion spinodals has been determined. It has been established that a gas-saturated mixture retains its stability against finite variations of state variables up to stretches close to the values near the diffusion spinodal. The statistic laws of the process of destruction of the metastable state have been investigated. The lifetimes of the metastable phase have been determined. It is shown that owing to the small height of the potential barrier that separates the microheterogeneous from the homogeneous state a system of finite size has a possibility to make the reverse transition from the microheterogeneous into the homogeneous state. The lifetimes of the system in the microheterogeneous state, as well as the expectation times of the occurrence of a critical nucleus, are described by Poissonian distributions.
\\\\Expert2\\NBO\\Journal of Chemical Physics\\2007, v.126, p.094502, S.P.Protsenko.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/C 20
Автор(ы) : Baidakov V. G., Kaverin A. M., Andbaeva V. N., Khotienkova M. N.
Заглавие : Capillary Constant of a Xenon–Helium Solution
Место публикации : Journal of Chemical & Engineering Data. - 2011. - Vol.56, №11. - С. 4123-4125
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): capillary method --xenon–helium solution
Аннотация: The differential capillary method has been used to measure the capillary constant of a xenon–helium solution. Experiments have been conducted in the temperature range from (165 to 267) K at pressures up to 4 MPa. An equation approximating the baric dependence of the capillary constant has been suggested
\\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2011, v.56, p. 4123-4125.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/C 20
Автор(ы) : Baidakov V. G., Khotienkova M. N., Andbaeva V. N., Kaverin A. M.
Заглавие : Capillary constant and surface tension of methane-nitrogen solutions: 1. Experiment
Место публикации : Fluid Phase Equilibria. - 2011. - Vol.301, №1. - С. 67-72
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): mixtures --oxygen
Аннотация: The differential version of the method of capillary rise has been used to measure the capillary constant and calculate the surface tension of methane-nitrogen solutions. Experiments. have been conducted in the temperature range from 95 to 170K at pressures up to 4 MPa. Experimental data on surface tension have been compared with the results of calculations by thermodynamic models. Equations are given which describe the dependence of the capillary constant of a solution on its temperature and composition.
\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2011, v.301, p. 67-72.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/B 93
Автор(ы) : Bulanov N. V., Gasanov B. M.
Заглавие : Peculiarities of boiling of emulsions with a low-boiling disperse phase
Место публикации : International Journal of Heat and Mass Transfer. - 2008. - Vol. 51, № 7-8. - С. 1628-1632
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling--nucleation site--heat trahsfer--activation of nucleation sites--superheated liquids
Аннотация: The heat transfer from thin wires to emulsions with a disperse phase formed from a liquid whose boiling temperature is much lower than the boiling temperature of the disperse medium was investigated. Experiments were conducted at atmospheric pressure on vertical and horizontal wires from 50 to 100 ?m in diameter with n-pentane/glycerine, diethyl ether/water, and freon-113/water and water/oil emulsions.??It was possible to describe the experimental data obtained by one analytical dependence Nu = AArPrM?1[1 ? exp(?JVt)]. The dependence presented was obtained from the proposed model of the chain branched activation of boiling centers in droplets of a superheated liquid. In this case the coefficient J acquires the meaning of the activation rate of these centers.??
\\\\Expert2\\NBO\\International Journal of Heat and Mass Transfer\\2008, v.51, p.1628.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/B 93
Автор(ы) : Bulanov N. V., Gasanov B. M.
Заглавие : Characteristic features of the boiling of emulsions having a low-boiling dispersed phase
Место публикации : Journal of Engineering Physics and Thermophysics. - 2006. - Vol. 79, № 6. - С. 1130-1133
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling
Аннотация: The results of investigation of heat transfer from thin wires to a boiling emulsion, the dispersed phase of which is formed from a liquid with a boiling temperature much lower than the boiling temperature of the dispersion medium, are presented. Two variants of boiling of such an emulsion are possible: boiling of the dispersed phase alone and simultaneous boiling of the dispersed phase and dispersion medium. In the present work, only the first variant has been studied; it is distinguished by the following most important features: high superheat of the dispersed-phase droplets ?Tsubsup/sub of the emulsion and a wide temperature range of bubble boiling (50–200°C). For conventional heat carriers (pure liquids and solutions), the value of ?Tsubsup/sub does not exceed 1–10°C, with the bubble-boiling interval lying within the range from 5 to 20°C.
\\\\Expert2\\NBO\\Journal of Engineering Physics and Thermophysics\\2006, v.79, N 6, P.1130.pdf
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Сиглы отделов ЦНБ УрО РАН

  бр.ф. - Бронированный фонд

  бф - Научно-библиографический отдел

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