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Труды сотрудников ЦНБ УрО РАН
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Общее количество найденных документов : 84
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1.

Вид документа : Статья из журнала
Шифр издания : 53/B 93
Автор(ы) : Bulanov N. V., Gasanov B. M., Baidakov V. G.
Заглавие : Mode of Bubble Boiling of Emulsion with a Low-Boiling Dispersed Phase
Место публикации : Heat Transfer Research. - 2002. - V. 33, N 3-4. - С. 166-168. - ISSN 1064-2285. - ISSN 1064-2285
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): кипение пузырьковое--пузырьковое кипение--эмульсии--дисперсные фазы--фазы дисперсные--низкокипящие фазы--фазы низкокипящие--теплоперенос--жидкости
Аннотация: The results of the experimental investigations on the heat transfer of thin wires with water/oil and ether/water emulsions are given. The temperature of normal oil boiling is not lower than 340°C. A considerable delay in the crisis of bubble boiling is obtained for both emulsions, and is particularly noticeable for the ether/water emulsion. In the latter case the coefficient of connective heat transfer and the density of heat flux substantially exceed the corresponding values for pure initial liquids in the entire investigated range of temperatures (from 20 to 230°C) and pressures (from 0.1 to 3.6 MPa)
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2.

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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3.

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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4.

Вид документа : Статья из журнала
Шифр издания : 53/B 74
Автор(ы) : Boltachev G. Sh., Baidakov V. G.
Заглавие : Properties of argon liquid-vapor interface
Место публикации : Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2006. - Vol. 68, № 1. - С. 26-31
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): argon
Аннотация: The short-wave cutoff boundary of the capillary wave spectrum is established. Effective thickness L b of the “bare” density profile in the interfacial layer is calculated according to experimental data on the ellipticity ratio of reflected light. The free parameters of the extended van der Waals theory of capillarity are determined. The positions of the equimolecular dividing surface and tension surface are calculated, as well as the temperature dependence of the Tolman parameter.
\\\\Expert2\\NBO\\Colloid Journal\\2006, V.68, N1,26.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Boltachev G. Sh.
Заглавие : Inclusion of corrections of the highest order of smallness in the Van der Waals capillarity theory
Место публикации : High Temperature. - 2005. - Vol. 43, № 4. - С. 538-545
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): van-der-waals chain-molecule fluid
Аннотация: An extended version of the Van der Waals capillarity theory is suggested, which describes the liquid-vapor interface in the temperature range from the triple to critical point. A model functional of thermodynamic potential of a two-phase Lennard-Jones system is suggested, which takes into account the impact of higher terms of gradient expansion. The identity of the thermodynamic and mechanical definitions of the Tolman parameter is proved within the accepted form of the functional. The properties of the liquid and vapor phase nuclei are described. The work of nucleation, the density profiles, and the dimensional dependence of surface tension are determined.
\\\\Expert2\\NBO\\High Temperature\\2005, v.43, p.538.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Boltachev G. Sh.
Заглавие : Extended version of the Van der Waals capillarity theory
Место публикации : Journal of Chemical Physics. - 2004. - Vol. 121, № 17. - С. 8594-8601
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): van-der-waals chain-molecule fluid
Аннотация: An extended version of the van der Waals capillarity theory describing the liguid-vapor interface in the temperature range from the triple to the critical point is suggested. A model functional of thermodynamic potential for a two-phase Lennard-Jones system taking into account the effect of the highest degree terms of gradient expansion has been constructed. The identity of the thermodynamic and the mechanical definition of Tolman’s length has been proved in the framework of the adopted form of functional. The properties of nuclei of the liquid and the vapor phase are described. The paper determines: the work of formation of a nucleus, density profiles, size dependences of the surface tension, and the parameter ? in the Gibbs-Tolman-Koenig-Buff equation.© 2004 American Institute of Physics.
\\\\Expert2\\NBO\\Journal of Chemical Physics\\2004, v.121, p.8594, V. G. Baidakov.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 53/B 74
Автор(ы) : Boltachev G. Sh., Zubarev N.M., Zubareva O. V.
Заглавие : Space charge influence on the angle of conical spikes developing on a liquid-metal anode
Место публикации : Physical Review E: Statistical, Nonlinear, and Soft Matter Physics. - 2008. - Vol. 77, № 5-2. - С. 056607/1-056607/10
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): argon
Аннотация: The influence of the space charge of ions emitted from the surface of a conical spike on its shape has been studied. The problem of the calculation of the spatial distributions of the electric field, ion velocity field, and the space charge density near the cone tip has been reduced to the analysis of a system of ordinary differential equations. As a result of numerical solution of these equations, the criterion for the balance of the capillary and electrostatic forces on the conic surface of a liquid-metal anode has been determined. It has allowed us to relate the electrical current flowing through the system, the applied potential difference, and the cone angle. We have compared the results of our calculations with available experimental data concerning emission from the surface of pure liquid gallium, indium, tin, and some liquid alloys, such as Au+Si, Co+Ge, and Au+Ge. On the basis of the proposed model, explanations have been given for a number of specific features of the emissive behavior of different systems.
\\\\Expert2\\NBO\\Physical Review E\\2008, v.77, N 5, p.056607.pdf
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8.

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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9.

Вид документа : Статья из журнала
Шифр издания : 53/B 74
Автор(ы) : Boltachev G. Sh., Zubarev N.M.
Заглавие : Influence of the space charge on the configuration of conical spikes on a liquid-metal surface
Место публикации : Europhysics Letters. - 2006. - Vol. 76, № 1. - С. 36-41
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): metal surface
Аннотация: The influence of the space charge of ions evaporated from the surface of a conical spike that develops on a liquid-metal anode on the spike shape has been studied theoretically. A possibility of the self-similar reduction of the equations that govern the space distributions of the electric field, ion velocity field, and space charge density to a system of ordinary differential equations has been revealed. Its solution, which is compatible with the balance condition for the capillary and electrostatic forces at a free liquid surface, has allowed us to obtain the current-voltage characteristic for a liquid-metal ion source and the current dependence of the cone angle. An increase in emission current leads to a monotonic decrease of the cone angle, which agrees with the available experimental data.
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10.

Вид документа : Статья из журнала
Шифр издания : 53/N 89
Автор(ы) : Novruzov A. N., Rakhmanova O. R., Galashev A. E.
Заглавие : Computer study of the absorption of ethane by aqueous ultradispersed medium: IR spectra
Место публикации : Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2008. - Vol. 70, № 1. - С. 55-63
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): ir spectra
Аннотация: Absorption of ethane molecules by water clusters containing 10–20 molecules is studied by the molecular dynamics method. The (H2O) n (I), C2H6(H2O) n (II), and (C2H6)2(H2O) n (III) cluster systems are composed on the basis of specific statistical weights. Spectral characteristics of system and single clusters are determined in the frequency range of 0 меньше либо равно омега меньше либо равно 1000 cm в степени -1. In this frequency range, both real and imaginary parts of dielectric permittivity decrease monotonically after the absorption of C2H6 molecules by an aqueous ultradispersed system. Integral coefficient of IR absorption increases, while average (over frequency) reflection coefficient decreases after the absorption of ethane molecules. The intensity of IR scattering by the systems of clusters containing C2H6 molecules lowers. Maximal values of radiation power for water clusters with various sizes are balanced with the capture of ethane molecules by the clusters, whereas oscillations in the size dependence of the density of electrons that are active with respect to IR radiation decrease.
\\\\Expert2\\NBO\\Colloid Journal\\2008, V.70, N 1, 55.pdf
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