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1.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : Attainable superheating of solutions of cryogenic liquids
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 109-118
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling-up--cryogenic liquids --kramers-zeldovich method
Аннотация: The kinetics of spontaneous boiling-up of superheated binary solutions of cryogenic liquids is studied. Within the framework of the Kramers-Zeldovich method, an expression is obtained for the steady state rate of homogeneous nucleation in a solution that takes into account free-molecular and diffusion regimes of the substance supply to a growing bubble. Viscous and inertial forces are also taken into account in the study of the nucleus growth dynamics. The work of critical nucleus formation is determined within the framework of the Gibbs and van der Waals capillarity theories. The dependence of the surface tension of critical bubbles in the solution on their size is investigated. The temperature of attainable superheating and nucleation rates in superheated solutions of cryogenic liquids with complete or partial solubility of the components are determined by a method of lifetime measurement. The experiments were conducted in a wide range of pressures and solution concentrations. The measurement results are compared with the theory of homogeneous nucleation taking or not taking into account the size effect in nucleation. It has been found that, by taking into account the size dependence of the surface tension of a nucleus, better agreement between the theory and experiment is obtained. The boundary of essential instability of the solution, that is, the diffusion spinodal, is computed
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2.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : Attainable superheating of solutions of cryogenic liquids
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 109-118
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling-up--cryogenic liquids --kramers-zeldovich method
Аннотация: The kinetics of spontaneous boiling-up of superheated binary solutions of cryogenic liquids is studied. Within the framework of the Kramers-Zeldovich method, an expression is obtained for the steady state rate of homogeneous nucleation in a solution that takes into account free-molecular and diffusion regimes of the substance supply to a growing bubble. Viscous and inertial forces are also taken into account in the study of the nucleus growth dynamics. The work of critical nucleus formation is determined within the framework of the Gibbs and van der Waals capillarity theories. The dependence of the surface tension of critical bubbles in the solution on their size is investigated. The temperature of attainable superheating and nucleation rates in superheated solutions of cryogenic liquids with complete or partial solubility of the components are determined by a method of lifetime measurement. The experiments were conducted in a wide range of pressures and solution concentrations. The measurement results are compared with the theory of homogeneous nucleation taking or not taking into account the size effect in nucleation. It has been found that, by taking into account the size dependence of the surface tension of a nucleus, better agreement between the theory and experiment is obtained. The boundary of essential instability of the solution, that is, the diffusion spinodal, is computed
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3.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Schmelzer J. W. P.
Заглавие : Boiling-Up Kinetics of Solutions of Cryogenic Liquids
Место публикации : Nucleation Theory and Applications. - Berlin: Wiley-VCH Verlag, 2005. - С. 126-175
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation kinetics--diffusion tensor of nuclei--nucleation rates
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4.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Schmelzer J. W. P.
Заглавие : Boiling-Up Kinetics of Solutions of Cryogenic Liquids
Место публикации : Nucleation Theory and Applications. - Berlin: Wiley-VCH Verlag, 2005. - С. 126-175
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation kinetics--diffusion tensor of nuclei--nucleation rates
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5.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Tipeev A. O.
Заглавие : Crystal nucleation and the solid–liquid interfacial free energy
Место публикации : Journal of Chemical Physics. - 2012. - Vol.136, №7. - С. 074510
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): lennard-jones fluid--crystal nucleation--metastable systems
Аннотация: We present the results of molecular dynamics simulation of crystal nucleation in a supercooled Lennard–Jones liquid. Temperature and baric dependences of the nucleation rate, the Zeldovich factor, nucleus size diffusion coefficient, the radius, and the pressure in a critical crystal nucleus are defined in computer simulation. The data obtained have been used in the framework of classical nucleation theory to calculate the effective surface energy of crystal nuclei γe. It is shown that the value of γe at T = const exceeds the value of the interfacial free energy at a flat crystal–liquid interface γ∞ and γe γ∞ at p
\\\\Expert2\\nbo\\Journal of Chemical Physics\\2012, V.136, p.074510.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Tipeev A. O.
Заглавие : Crystal nucleation and the solid–liquid interfacial free energy
Место публикации : Journal of Chemical Physics. - 2012. - Vol.136, №7. - С. 074510
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): lennard-jones fluid--crystal nucleation--metastable systems
Аннотация: We present the results of molecular dynamics simulation of crystal nucleation in a supercooled Lennard–Jones liquid. Temperature and baric dependences of the nucleation rate, the Zeldovich factor, nucleus size diffusion coefficient, the radius, and the pressure in a critical crystal nucleus are defined in computer simulation. The data obtained have been used in the framework of classical nucleation theory to calculate the effective surface energy of crystal nuclei γe. It is shown that the value of γe at T = const exceeds the value of the interfacial free energy at a flat crystal–liquid interface γ∞ and γe γ∞ at p
\\\\Expert2\\nbo\\Journal of Chemical Physics\\2012, V.136, p.074510.pdf
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7.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kaverin A. M., Boltachev G. Sh.
Заглавие : Experimental investigations of nucleation in helium-oxygen mixtures
Место публикации : Journal of Physical Chemistry B. - 2002. - Vol.106, №1. - С. 167-175
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): supersaturated solutions--homogeneous nucleation--surface tension
Аннотация: The paper presents the results of experimental investigations of nucleation in helium-oxygen gas-filled mixtures. Temperature dependences of the mean lifetime of a mixture in the metastable (superheated) state have been determined, and nucleation rates have been calculated by experiments at fixed pressures of 1.171 and 1.667 MPa and at several values of concentrations. Experimental data are compared with results of the homogeneous nucleation theory in a macroscopic (capillary) approximation and with allowance for the dependence of the properties of nuclei on the curvature of their dividing surface. The size effect of nucleation is taken into account in the framework of the van der Waals, Cahn-Hilliard method. The equation of state of the mixture has been built, and the boundary of stability of homogeneous states, the diffusion spinodal, has been determined. The paper discusses the problems of building a nucleation theory for gas-filled mixtures and states a good agreement between theory and experiment at nucleation rates J similar or equal to 10(7) m(-1) s(-1) when the size effect in nucleation is taken into account
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8.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kaverin A. M., Boltachev G. Sh.
Заглавие : Experimental investigations of nucleation in helium-oxygen mixtures
Место публикации : Journal of Physical Chemistry B. - 2002. - Vol.106, №1. - С. 167-175
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): supersaturated solutions--homogeneous nucleation--surface tension
Аннотация: The paper presents the results of experimental investigations of nucleation in helium-oxygen gas-filled mixtures. Temperature dependences of the mean lifetime of a mixture in the metastable (superheated) state have been determined, and nucleation rates have been calculated by experiments at fixed pressures of 1.171 and 1.667 MPa and at several values of concentrations. Experimental data are compared with results of the homogeneous nucleation theory in a macroscopic (capillary) approximation and with allowance for the dependence of the properties of nuclei on the curvature of their dividing surface. The size effect of nucleation is taken into account in the framework of the van der Waals, Cahn-Hilliard method. The equation of state of the mixture has been built, and the boundary of stability of homogeneous states, the diffusion spinodal, has been determined. The paper discusses the problems of building a nucleation theory for gas-filled mixtures and states a good agreement between theory and experiment at nucleation rates J similar or equal to 10(7) m(-1) s(-1) when the size effect in nucleation is taken into account
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9.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kozlova Z. R.
Заглавие : The self-diffusion coefficient in metastable states of a Lennard-Jones fluid
Место публикации : Chemical Physics Letters. - 2010. - Vol.500, №1-3. - С. 23-27
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): molecular-dynamics simulation--critical points--viscosity
Аннотация: Molecular-dynamics computer simulation has been used to calculate the self-diffusion coefficient of a Lennard-Jones fluid in the interval of reduced temperatures T* = 0.35-2.0, through mean-squared particles displacements and the velocity autocorrelation function. Calculations have been performed for systems in stable and metastable states up to the boundary of spontaneous nucleation in a model of a fluid consisting of 2048 particles. The values of the self-diffusion coefficient on the spinodals of a superheated liquid and supersaturated vapor have been determined. It has been established that in the region of supercooled states of the liquid phase on an isotherm the logarithm of the self-diffusion coefficient is a linear function of the pressure
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10.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kozlova Z. R.
Заглавие : The self-diffusion coefficient in metastable states of a Lennard-Jones fluid
Место публикации : Chemical Physics Letters. - 2010. - Vol.500, №1-3. - С. 23-27
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): molecular-dynamics simulation--critical points--viscosity
Аннотация: Molecular-dynamics computer simulation has been used to calculate the self-diffusion coefficient of a Lennard-Jones fluid in the interval of reduced temperatures T* = 0.35-2.0, through mean-squared particles displacements and the velocity autocorrelation function. Calculations have been performed for systems in stable and metastable states up to the boundary of spontaneous nucleation in a model of a fluid consisting of 2048 particles. The values of the self-diffusion coefficient on the spinodals of a superheated liquid and supersaturated vapor have been determined. It has been established that in the region of supercooled states of the liquid phase on an isotherm the logarithm of the self-diffusion coefficient is a linear function of the pressure
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