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Общее количество найденных документов : 204
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1.
Инвентарный номер: нет.
   
   F 68


   
    Flicker-Noise in Superheated Liquid Jets / A. V. Reshetnikov, V. P. Skripov, V. P. Koverda, N. A. Mazheiko, A. V. Vinogradov // Heat Transfer Research. - 2004. - Vol. 35, № 1-2. - С. 59-66
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING-UP LIQUID -- CRITICAL MODES -- VAPOR FORMATION
Аннотация: Change of the shape of a boiling-up liquid jet flowing from a high-pressure vessel at high superheatings was investigated experimentally. Mechanisms of volumetric heterogeneous and homogeneous nucleation are distinguished and their connection with critical modes of outflow is determined. Results of the experimental study of recoil of boiling-up liquid jets in a thermodynamically strong nonequilibrium mode of outflow are presented. The dynamics of vapor content fluctuations is studied by a method of photometry of passed laser radiation. Fluctuations of pressure in a superheated liquid jet at various mechanisms of vapor formation are measured by a method of strain metering. It was found that in intense volumetric boiling-up of a superheated liquid jet the power spectrum of fluctuations has a low-frequency component (flicker-noise) which diverges according to the 1/f law. This effect is related to nonequilibrium phase transitions in the system

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2.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Nucleation at retrograde condensation [] / V. G. Baidakov, G. Sh. Boltachev // AIP Conference Proceedings. - 2000. - Vol. 534, Is. 1. - 295-298: graph. . - ISSN 0094-243X
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
NUCLEATION -- CONDENSATION -- SURFACE TENSION -- RETROGRADE CONDENSATION
Аннотация: A binary Van-der-Waals solution is considered. Within the framework of the Gibbs and Van-der-Waals capillary theories under the conditions of constancy of the temperature and the composition the sise dependences of surface tension s(R) are calculated for critical nuclei of liquid and vapor. The phenomenon of "closure" of size dependences s(R) and the presence anomalously of high maximums on them are established

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3.
Инвентарный номер: нет.
   
   B 74


    Boltachev, G. Sh.
    On the Discrepancy between the Theory of Homogeneous Nucleation and Experimental Data for Gas-Saturated Liquids at Low Temperatures [] / G. Sh. Boltachev, V. G. Baidakov // Russian Journal of Physical Chemistry A. - 2001. - V. 75, N 9. - С. 1455-1458. - Bibliogr: p. 1458 (111 ref.) . - ISSN 0044-4537
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HOMOGENEOUS NUCLEATION -- THEORY OF HOMOGENEOUS NUCLEATION -- LIQUIDS -- GAS-SATURATED LIQUIDS -- LOW TEMPERATURES

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4.
Инвентарный номер: нет.
   
   S 34


    Schmelzer, J. W. P.
    Kinetics of Boiling in Binary Liquid-Gas Solutions : A New Approach / J. W. P. Schmelzer, V. G. Baidakov, G. Sh. Boltachev // Nucleation Theory and Applications. - Dubna : JINR, 2002. - С. 120-145. - Bibliogr. : p.140-145 (83 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CLUSTERS -- LIQUIDS -- HOMOGENEOUS NUCLEATION

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5.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Boiling-Up Kinetics of Solutions of Cryogenic Liquids / V. G. Baidakov // Nucleation Theory and Applications. - Dubna : JINR, 2002. - С. 19-87. - Bibliogr. : p. 83-87 (77 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING-UP -- METHOD KRAMER-ZELDOVICH -- NUCLEATION KINETICS

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6.
Инвентарный номер: нет.
   
   S 66


    Skripov, V. P.
    Solid Liquid and Liquid-Vapor Phase Transitions / V. P. Skripov, M. Z. Faizullin // Nucleation Theory and Applications. - Dubna : JINR, 2002. - P4-18. - Bibliogr.: p. 17-18 (21 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SOLID-LIQUIDS -- SODIUM -- CRITICAL POINTS

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7.
Инвентарный номер: нет.
   
   N 91


   
    Nucleation in Liquid Xenon near the Critical-Point [] / V. G. Baidakov, A. M. Rubshtein, T. A. Evdokimova, V. P. Skripov // Physics Letters A. - 1982. - V.88, Is.4. - С. 196-198
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
NUCLEATION -- XENON LIQUID -- Xe -- POINT CRITICAL

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8.
Инвентарный номер: нет.
   
   S 34


    Schmelzer, W. P.
    Classical and generalized Gibbs approaches and the properties of critical clusters in nucleation theory [] / W. P. Schmelzer // Метастабильные состояния и фазовые переходы : сб. науч. тр. / Ин-т теплофизики УрО РАН. - 2008. - Вып.9. - С. 168-175. - Библиогр.: с. 175 (9 назв.) . - ISBN 5-7691-1945-4
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ARGON

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9.
Инвентарный номер: нет.
   
   S 66


    Skripov, V. P.
    Kinetic aspect of the life of tensile specimens: A comparison of two approaches [Текст] / V. P. Skripov, V. E. Vinogradov // Journal of Applied Mechanics and Technical Physics. - 2005. - Vol. 46, № 5. - С. 697-701
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
KINETICS ASPECTS
Аннотация: This paper considers two approaches to estimating the life of specimens: kinetic strength theory and homogeneous nucleation theory. Using aluminum as an example, it is shown that homogeneous nucleation theory overestimates the real life of tensile metal specimens by two order of magnitude and gives values close to the theoretical strength of metals. The use of experimental data on the lifetime of a superheated and stretched liquid (hexane) allows one to couple both approaches taking into account the time scale of occurrence of metastability.

\\\\Expert2\\NBO\\Journal of Applied Mechanics and Technical Physics\\2005, v. 46, p.697.pdf
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10.
Инвентарный номер: нет.
   
   G 15


    Galashev, A. E.
    Molecular Dynamics Study of Crystallization of Supercooled Liquid Sodium [] / A. E. Galashev, I. P. Chernysheva // Inorganic Materials. - 1999. - V.35, N1. - С. 42-48
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
STUDY MOLECULAR-DYNAMIC -- CRYSTALLIZATION -- SODIUM -- Na -- SODIUM LIQUID -- SODIUM SUPERCOOLED -- CRYSTAL NUCLEATION -- HOMOGENEOUS NUCLEATION -- SIMULATION -- RUBIDIUM -- Rb -- MODEL
Аннотация: Crystallization of supercooled liquid sodium containing a spheroidal bce nucleus was studied by molecular dynamics simulations. The degree of supercooling and the critical nucleus size are determined. After solidification, the system exhibits elasticity of shear. Nucleus growth is accompanied by self-sustained aperiodic temperature oscillations. The radial distribution function is computed and Voronoi polyhedra are constructed for the system immediately before and after the transition. It is shown by the projection method that the crystallized system contains structural defects and Features a long-range order

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11.
Инвентарный номер: нет.
   
   B 65


    Blednykh, Ye. I.
    Thermodynamic and Structural Conditions of Bubbles Nucleation in Gas-Saturated Polymethyl Methacrylate [] / Ye. I. Blednykh, V. P. Skripov // Polymer Science. Series B. - 1992. - V.34, N9. - С. 61-65
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
THERMODYNAMIC CONDITIONS OF NUCLEATION -- STRUCTURAL CONDITIONS OF NUCLEATION -- NUCLEATION BUBBLES -- POLYMETHYL METHACRYLATE GAS-SATURATED -- NUCLEATION HOMOGENEOUS -- CARBON DIOXIDE -- LIMIT GAS-POLYMER

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12.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Experimental-study of cryogenic liquids in the metastable superheated state [] / V. G. Baidakov, V. P. Skripov // Experimental Thermal and Fluid Science. - 1992. - V.5, Is.5. - С. 664-678
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUID CRYOGENIC -- STATE METASTABLE -- STATE SUPERHEATED -- DEPENDENCE OF TEMPERATURE -- NUCLEATION -- p-PROPERTIES -- rho-PROPERTIES -- T-PROPERTIES -- ULTRASOUND VELOCITY
Аннотация: The results of an experimental investigation of cryogenic liquids in a metastable (superheated) state are considered. Data are presented on the maximum attainable superheat temperature of typical cryogenic liquids from atmospheric to close to critical pressures. The nucleation mechanism and the influence of factors that induce boiling on the attainable superheat of liquids are discussed. The results of experiments are compared with theory. Data on the thermodynamic properties (P, rho, T properties, heat capacity, ultrasonic velocity and attenuation, volume viscosity) of cryogenic liquids in a metastable liquids is discussed. Explosive boiling phenomena connected with large superheats of cryogenic liquids are considered, and the discharge of cryogenic liquids through short tubes and the heat interaction of cold liquid droplets with a hot surface are investigated

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13.
Инвентарный номер: нет.
   
   K 79


    Koverda, V. P.
    1/f - Noise at non-equilibrium phase transitions / V. P. Koverda, V. N. Skokov, A. V. Reshetnikov // Nucleation Theory and Applications. - Dubna : JINR, 2002. - С. 259-272. - Bibliogr. : p.271-272 (17 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
FLICKER NOISE -- FLUCTUATION -- FILMS

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14.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Experimental investigations of nucleation in helium-oxygen mixtures / V. G. Baidakov, A. M. Kaverin, G. Sh. Boltachev // Journal of Physical Chemistry B. - 2002. - Vol.106, №1. - С. 167-175
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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15.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Kinetics of boiling-up of a gassed liquid / V. G. Baidakov, A. M. Kaverin, G. Sh. Boltachev // Heat Transfer Research. - 2007. - Vol.38, №3. - С. 211-221
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUID -- SOLUTIONS -- INERTIAL FORCES
Аннотация: A theory of the spontaneous boiling-up of supersaturated liquid solutions, which allows for all major factors limiting growth of a nucleus, such as volatility of solution components, viscous and inertial forces, and diffusional supply of a substance to the bubble, is proposed. Two approaches to determining the work of critical nucleus formation, based on the Gibbs method of diving surfaces and the Van der Waals theory of capillarity, are reviewed. Experimental data on the kinetics of boiling-up of nitrogen-helium and oxygen-helium solutions are presented. The results of the experiments are compared to the theoretical approaches to the problem of nucleation in gassed liquids, developed by the authors

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16.
Инвентарный номер: нет.
   
   V 70


    Vinogradov, V. E.
    Cavitation strength of an argon-helium solution / V. E. Vinogradov, P. A. Pavlov, V. G. Baidakov // Chemical Physics Letters. - 2009. - Vol.474, № 4-6. - С. 294-296
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EXPLOSIVE CAVITATION -- HELIUM-SATURATED LIQUID -- THIN PLATINUM
Аннотация: The kinetics of explosive cavitation has been studied by experiment in helium-saturated liquid argon. Measurements have been made by the method of pulse heating of a solution on a thin platinum wire in a negative-pressure wave. The temperature dependence of cavitation strength has been traced, the effective values of the nucleation rate J and the derivative dlnJ/dT have been determined. It has been found that the dissolution of helium results in decreasing cavitation strength of argon. Satisfactory agreement between data of homogeneous nucleation theory and experiment with the use of capillarity approximation in the latter, though limiting stretches (superheats) attained by experiment are nevertheless systematically lower than calculated ones

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17.
Инвентарный номер: нет.
   
   C 91


   
    Crystal nucleation rate isotherms in lennard-jones liquids [Electronic resource] / V. G. Baidakov, A. O. Tipeev, K. S. Bobrov, G. V. Ionov // Journal of Chemical Physics. - 2010. - Vol.132, №23. - P234505
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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18.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Comparison of Different Approaches to the Determination of the Work of Critical Cluster Formation / V. G. Baidakov, G. Sh. Boltachev, J. W. P. Schmelzer // Journal of Colloid and Interface Sience. - 2000. - Vol. 231, № 2. - С. 312-321
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL CLUSTER -- GIBBS' METHOD -- NUCLEATION RATES
Аннотация: A comparative analysis of the results of determination of the work of critical cluster formation in nucleation theory for three different methods of evaluation—Gibbs' method, the van der Waals-Cahn and Hilliard, and a newly developed modified Gibbs' approach—is given. As a model system for comparison, regular solutions are chosen. In addition to the work of critical cluster formation, the composition of the critical clusters, their characteristic sizes and the values of the surface tension are determined in dependence on the initial supersaturation in the system or, equivalently, on the size of the critical clusters. It is found, in particular, that, for regular solutions, Tolman's equation cannot serve as a first approximation for the description of the curvature dependence of the surface tension even for large cluster sizes and an alternative formula is developed. It is shown that the latter two mentioned methods of determination of the work of critical cluster formation (the van der Waals-Cahn and Hilliard and the modified Gibbs' approach) lead—at least for the model system considered—to qualitatively and partly quantitatively equivalent results. Nevertheless, differences remain which may lead to quantitative deviations when applied to the determination of the steady-state nucleation rates. The possible origin of such deviations is discussed and some further directions of analysis are anticipated

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19.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    On two approaches to determination of the nucleation rate of a new phase in computer experiments / V. G. Baidakov, A. O. Tipeev // Thermochimica Acta. - 2011. - Vol.522, №1-2. - С. 14-19
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HOMOGENEOUS NUCLEATION -- MOLECULAR DYNAMICS -- METASTABLE SYSTEMS
Аннотация: The present paper gives a comparative evaluation of two approaches to the determination of the homogeneous nucleation rate in molecular dynamics computer experiments, viz. the methods of the mean lifetime of a metastable system and the mean time of the first passage to a cluster of a prescribed size. The crystal nucleation rate in a supercooled Lennard–Jones liquid has been determined in molecular dynamics simulation as a function of pressure at a reduced temperature T* = 0.55. The results of simulation have been compared with classical homogeneous nucleation theory. Good agreement between theory and the results of computer simulation has been found

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20.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    The self-diffusion coefficient in metastable states of a Lennard-Jones fluid / V. G. Baidakov, Z. R. Kozlova // Chemical Physics Letters. - 2010. - Vol.500, №1-3. - С. 23-27
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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