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Труды сотрудников Института теплофизики УрО РАН
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Труды сотрудников ЦНБ УрО РАН
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1.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Pankov A. S.
Заглавие : Nucleation in ethane–nitrogen solutions. II. Heterogeneous and initiated nucleation [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 86. - С. 936-942
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0017931015003312
Примечания : Bibliogr. : p. 942 (18 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation --method of continuous pressure lowering--heterogeneous nucleation --superheating
Аннотация: The method of continuous pressure decrease has been used to investigate limiting (attainable) stretches of ethane–nitrogen solutions. Experiments were conducted at temperatures of 260, 266, 270, and 276 K and at nitrogen concentrations in the solution of 0.5 and 1.5 mol%. Pressure decrease rates were taken in the range 0.01–0.1 MPa/s. Distribution functions of liquid boiling-up events in dependence on pressure have been obtained allowing one to determine the most probable (attainable) pressures of liquid boiling-up and the nucleation rate. The results are interpreted in terms of nucleation thermodynamics and kinetics in liquids on a solid surface containing inclusions that initiate the boiling-up processes. It is shown that for realizing homogeneous nucleation it is not necessarily required that the wettability is close to the ideal one. The reasons for the discrepancy between experimental data and predictions of homogeneous nucleation theory at nucleation rates J 3 × 106 s−1 m−3 are discussed.
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 86, p.936-942.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Pankov A. S.
Заглавие : Nucleation in ethane–nitrogen solutions. II. Heterogeneous and initiated nucleation [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 86. - С. 936-942
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0017931015003312
Примечания : Bibliogr. : p. 942 (18 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation --method of continuous pressure lowering--heterogeneous nucleation --superheating
Аннотация: The method of continuous pressure decrease has been used to investigate limiting (attainable) stretches of ethane–nitrogen solutions. Experiments were conducted at temperatures of 260, 266, 270, and 276 K and at nitrogen concentrations in the solution of 0.5 and 1.5 mol%. Pressure decrease rates were taken in the range 0.01–0.1 MPa/s. Distribution functions of liquid boiling-up events in dependence on pressure have been obtained allowing one to determine the most probable (attainable) pressures of liquid boiling-up and the nucleation rate. The results are interpreted in terms of nucleation thermodynamics and kinetics in liquids on a solid surface containing inclusions that initiate the boiling-up processes. It is shown that for realizing homogeneous nucleation it is not necessarily required that the wettability is close to the ideal one. The reasons for the discrepancy between experimental data and predictions of homogeneous nucleation theory at nucleation rates J 3 × 106 s−1 m−3 are discussed.
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 86, p.936-942.pdf
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3.

Вид документа : Статья из журнала
Шифр издания : 53/E 93
Автор(ы) : Ionov G. V., Dremov V. V., Karavaev A. V., Protsenko S.P., Baidakov V. G., Tipeev A. O.
Заглавие : Evaluation of metastable region boundaries for liquid and solid states in MD simulations [Электронный ресурс]
Место публикации : Journal of Physics : Condensed Matter. - 2014. - Vol.500, №17. - С. Article number 172004
Систем. требования: http://www.scopus.com/record/display.url?eid=2-s2.0-84902335896&origin=resultslist&sort=plf-f&src=s&st1=Baidakov&st2
Примечания : Bibliogr. : (6 ref) . - 26.08.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): diffusion--dynamic loads--liquids
Аннотация: An automatic method based on MD simulations was developed for detecting and tracing the boundaries of metastable states of superheated crystal and supercooled liquid. The main criterion of the detection of early nucleation of new phase is the self-diffusion coefficient temperature dependence. The scanning for nucleation events is performed at continuous temperature change. The set of independent nucleation events at a given pressure allows evaluation of temperature dependence of specific nucleation frequency. The collection of a large number of these calculations allows accurate approximation of pressure and temperature dependence of the specific nucleation frequency in both directions between phases. This dependence allows estimating the behavior of the free energy in the region between superheating and supercooling curves. In addition, dependence of nucleation frequency on pressure and temperature provides an opportunity to integrate the probability of nucleation under dynamic loading and subsequent release and thus to determine the likelihood of the crystallization and melting. The technique was applied to tin. MD simulation was carried out with the help of the EAM interatomic potential, well reproducing the properties of BCC phase.
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4.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Protsenko S.P.
Заглавие : Metastable Lennard-Jones fluids. II. Thermal conductivity [Электронный ресурс]
Место публикации : Journal of Chemical Physics. - 2014. - Vol.140, №21. - С. 214506
Систем. требования: http://scitation.aip.org/content/aip/journal/jcp/140/21/10.1063/1.4880958
Примечания : Bibliogr. : p. 214506 (44 ref.). - 25.08.2015
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): molecular dynamics--lennard-jones liquid
Аннотация: The method of equilibrium molecular dynamics with the use of the Green-Kubo formalism has been used to calculate the thermal conductivity λ in stable and metastable regions of a Lennard-Jones fluid. Calculations have been made in the range of reduced temperatures 0.4 ≤ T* = k BT/ε ≤ 2.0 and densities 0.01 ≤ ρ* = ρσ3 ≤ 1.2 on 15 isotherms for 234 states, 130 of which refer to metastable regions: superheated and supercooled liquids, supersaturated vapor. Equations have been built up which describe the dependence of the regular part of the thermal conductivity on temperature and density, and also on temperature and pressure. It has been found that in (p, T) variables in the region of a liquid-gas phase transition a family of lines of constant value of excess thermal conductivity Δλ = λ - λ0, where λ0 is the thermal conductivity of a dilute gas, has an envelope which coincides with the spinodal. Thus, at the approach to the spinodal of a superheated liquid and supersaturated vapor (∂Δλ /∂p)T → ∞, (∂Δλ/∂T) p → ∞.
\\\\expert2\\nbo\\Journal of Chemical Physics\\2014, v.140, p.214506.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Protsenko S.P.
Заглавие : Metastable Lennard-Jones fluids. II. Thermal conductivity [Электронный ресурс]
Место публикации : Journal of Chemical Physics. - 2014. - Vol.140, №21. - С. 214506
Систем. требования: http://scitation.aip.org/content/aip/journal/jcp/140/21/10.1063/1.4880958
Примечания : Bibliogr. : p. 214506 (44 ref.). - 25.08.2015
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): molecular dynamics--lennard-jones liquid
Аннотация: The method of equilibrium molecular dynamics with the use of the Green-Kubo formalism has been used to calculate the thermal conductivity λ in stable and metastable regions of a Lennard-Jones fluid. Calculations have been made in the range of reduced temperatures 0.4 ≤ T* = k BT/ε ≤ 2.0 and densities 0.01 ≤ ρ* = ρσ3 ≤ 1.2 on 15 isotherms for 234 states, 130 of which refer to metastable regions: superheated and supercooled liquids, supersaturated vapor. Equations have been built up which describe the dependence of the regular part of the thermal conductivity on temperature and density, and also on temperature and pressure. It has been found that in (p, T) variables in the region of a liquid-gas phase transition a family of lines of constant value of excess thermal conductivity Δλ = λ - λ0, where λ0 is the thermal conductivity of a dilute gas, has an envelope which coincides with the spinodal. Thus, at the approach to the spinodal of a superheated liquid and supersaturated vapor (∂Δλ /∂p)T → ∞, (∂Δλ/∂T) p → ∞.
\\\\expert2\\nbo\\Journal of Chemical Physics\\2014, v.140, p.214506.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Protsenko S.P.
Заглавие : Metastable Lennard-Jones fluids. III. Bulk viscosity [Электронный ресурс]
Место публикации : Journal of Chemical Physics. - 2014. - Vol. 141, № 11. - С. 114503
Систем. требования: http://scitation.aip.org/content/aip/journal/jcp/141/11/10.1063/1.4895624
Примечания : Библиогр.: с. 114503 (35 ref.). - 25.08.2015
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): liquids--thermal conductivity of gases--molecular dynamics
Аннотация: The method of equilibrium molecular-dynamics simulation in combination with the Green-Kubo formula has been used to calculate the bulk viscosity of a Lennard-Jones fluid. Calculations have been made at temperatures 0.4 ≤ kBT/ε ≤ 2.0 and densities 0.0075 ≤ ρσ3≤ 1.2 at 116 stable and 106 metastable states of liquid and gas. The depth of penetration into the region of metastable states was limited by spontaneous nucleation. In the region of stable states the data obtained are compared with the results of previous investigations. It has been established that the system transition across the lines of liquid-gas and liquid-crystal phase equilibrium and penetration into the metastable regions of liquid and gas are connected with increasing bulk viscosity. The behavior of bulk viscosity close to the spinodal of a superheated liquid and supersaturated vapor is discussed
\\\\expert2\\nbo\\Journal of Chemical Physics\\2014, v.140, p.114503.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 53/E 93
Автор(ы) : Ionov G. V., Dremov V. V., Karavaev A. V., Protsenko S.P., Baidakov V. G., Tipeev A. O.
Заглавие : Evaluation of metastable region boundaries for liquid and solid states in MD simulations [Электронный ресурс]
Место публикации : Journal of Physics : Condensed Matter. - 2014. - Vol.500, №17. - С. Article number 172004
Систем. требования: http://www.scopus.com/record/display.url?eid=2-s2.0-84902335896&origin=resultslist&sort=plf-f&src=s&st1=Baidakov&st2
Примечания : Bibliogr. : (6 ref) . - 26.08.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): diffusion--dynamic loads--liquids
Аннотация: An automatic method based on MD simulations was developed for detecting and tracing the boundaries of metastable states of superheated crystal and supercooled liquid. The main criterion of the detection of early nucleation of new phase is the self-diffusion coefficient temperature dependence. The scanning for nucleation events is performed at continuous temperature change. The set of independent nucleation events at a given pressure allows evaluation of temperature dependence of specific nucleation frequency. The collection of a large number of these calculations allows accurate approximation of pressure and temperature dependence of the specific nucleation frequency in both directions between phases. This dependence allows estimating the behavior of the free energy in the region between superheating and supercooling curves. In addition, dependence of nucleation frequency on pressure and temperature provides an opportunity to integrate the probability of nucleation under dynamic loading and subsequent release and thus to determine the likelihood of the crystallization and melting. The technique was applied to tin. MD simulation was carried out with the help of the EAM interatomic potential, well reproducing the properties of BCC phase.
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8.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Protsenko S.P.
Заглавие : Metastable Lennard-Jones fluids. III. Bulk viscosity [Электронный ресурс]
Место публикации : Journal of Chemical Physics. - 2014. - Vol. 141, № 11. - С. 114503
Систем. требования: http://scitation.aip.org/content/aip/journal/jcp/141/11/10.1063/1.4895624
Примечания : Библиогр.: с. 114503 (35 ref.). - 25.08.2015
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): liquids--thermal conductivity of gases--molecular dynamics
Аннотация: The method of equilibrium molecular-dynamics simulation in combination with the Green-Kubo formula has been used to calculate the bulk viscosity of a Lennard-Jones fluid. Calculations have been made at temperatures 0.4 ≤ kBT/ε ≤ 2.0 and densities 0.0075 ≤ ρσ3≤ 1.2 at 116 stable and 106 metastable states of liquid and gas. The depth of penetration into the region of metastable states was limited by spontaneous nucleation. In the region of stable states the data obtained are compared with the results of previous investigations. It has been established that the system transition across the lines of liquid-gas and liquid-crystal phase equilibrium and penetration into the metastable regions of liquid and gas are connected with increasing bulk viscosity. The behavior of bulk viscosity close to the spinodal of a superheated liquid and supersaturated vapor is discussed
\\\\expert2\\nbo\\Journal of Chemical Physics\\2014, v.140, p.114503.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 53/I-70
Автор(ы) : Rutin S. B., Skripov P. V.
Заглавие : Investigation of not fully stable fluids by the method of controlled pulse heating. 1. Experimental approach
Место публикации : Thermochimica Acta. - 2013. - Vol.562. - С. 70-74
Примечания : Bibliogr. : p. 74 (21 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): power control--pulse heating--supercritical fluids
Аннотация: We are developing an experimental approach to investigation of the properties of not fully stable fluids based on the procedure of controlled pulse heating of a thin wire probe using pulse lengths from 1 to 10 ms. We shall use the term "not fully stable" to refer to fluids that lose their stability in the course of heating (superheated liquids and thermally unstable ones), as well as to initially unstable systems (nanofluids and supercritical ones). In this paper, the peculiarities of the technique and the device operation are discussed. The applicability of the approach is illustrated by demonstration experiments with not fully stable fluids using the constant heating power mode
\\\\expert2\\NBO\\Thermochimica Acta\\2013, v. 562, p.70-74.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 53/E 97
Автор(ы) : Gurashkin A. L, Starostin A.A., Uimin A.A., Yampol'skiy A. D., Ermakov G. V., Skripov P. V.
Заглавие : Experimental determination of superheated liquid density by the optical fiber method
Место публикации : Journal of Engineering Thermophysics. - 2013. - Vol.22, №3. - С. 194-202
Примечания : Bibliogr. : p. 202 (21 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): optical fiber method--superheated liquid density --liquid-vapor
Аннотация: An experimental approach to determination of the density of liquid superheated with respect to the liquid-vapor equilibrium temperature, including the range of high degrees of superheating, is developed. The approach is based on application of an optical fiber method combined with a pure bubble chamber. Performance of the method for investigation of the refractive index and density for superheated liquids as functions of temperature and pressure is illustrated in experiments with n-hexane as a reference substance for thermophysical measurements. The relative density measurements are performed with a resolution up to 10-4 at a characteristic time of 1 ms. For absolute measurements, the setup should be calibrated by the known data on the liquid density for the saturation line
\\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2013, V.22, N 3. P. 194-202.pdf
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