Б 79 Болтачев, Г. Ш. Термодинамические свойства азота, аргона, кислорода и их смесей в области фазового перехода жидкость-газ [] = The thermodynamic properties of nitrogen, argon, oxygen, and their mixtures in the region of the liquid-gas phase transition / Г. Ш. Болтачев, В. Г. Байдаков // Журнал физической химии. - 2006. - V. 80, N 4. - 594-597: рис., табл. - Библиогр: с. 597 (9 назв.) . - ISSN 0044-4537 Рубрики: ФИЗИКА Кл.слова (ненормированные): ФАЗОВЫЙ ПЕРЕХОД ЖИДКОСТЬ-ГАЗ -- МЕТАСТАБИЛЬНЫЕ ОБЛАСТИ -- ЛАБИДЬНЫЕ ОБЛАСТИ -- спинодали -- ОБЛАСТИ ЛАБИЛЬНЫЕ -- ОБЛАСТИ МЕТАСТАБИЛЬНЫЕ Аннотация: Предложена процедура построения уравнения состояния для метастабильных и лабильных областей при переходе жидкость-газ. Достигнуто согласованное описание р,Т и калорических свойств. Локализованы положения спинодалей как чистых флюидов, так и их смесей |
A 10 A computer study of the absorption of infrared radiation by systems of molecular clusters [Текст] / A. N. Novruzov, V. N. Chukanov, O. R. Rakhmanova, A. E. Galashev // High Temperature. - 2006. - Vol. 44, № 6. - С. 932-940 Рубрики: ФИЗИКА Кл.слова (ненормированные): MOLECULAR CLASTERS Аннотация: The method of molecular dynamics is used to investigate the process of absorption of N2O and CH4 molecules by water clusters and to determine the frequency spectra of permittivity for systems consisting of clusters mixed in different ratios, namely, (H2O)n, (N2O)i(H2O)10, and (CH4)i(H2O)10. IR-radiation absorption spectra for these systems are calculated and analyzed; the radiation power scattered by these systems and the tangent of dielectric loss angle are determined. The inclusion of anharmonicity of phonon oscillation makes it possible to explain the origin of characteristic frequencies appearing in IR spectra of mixtures of cluster systems. The capture of molecules of greenhouse gases by an ultradisperse aqueous medium affects the ability of this medium to absorb terrestrial radiation, i.e., reduces the greenhouse effect. \\\\Expert2\\NBO\\High Temperature\\2006, v.44, p.932.pdf |
S 91 Sulla, I. I. Liquid-vapor interface in argon-crypton system [] : 2. Description within Van-der-Waals capillarity theory / I. I. Sulla, V. G. Baidakov // Zhurnal Fizicheskoi Khimii. - 1994. - V.68, N1. - С. 67-70 Рубрики: ФИЗИКА Кл.слова (ненормированные): INTERFACE LIQUID-VAPOR -- SYSTEM ARGON-KRYPTON -- ARGON -- Ar -- KRYPTON -- THEORY VAN-der-WAALS -- THEORY CAPILLARITY -- MIXTURES -- SURFACE TENSION |
S 66 Skripov, V. P. Thermodynamic Similarity of Phase-Separating Binary-Liquid Mixtures Having an Upper Critical-Temperature [] / V. P. Skripov, M. Z. Faizullin // Journal of Chemical Thermodynamics. - 1989. - V.21, Is.7. - С. 687-700 Рубрики: ФИЗИКА Кл.слова (ненормированные): PHASE-SEPARATIONS |
C 20 Capillary constant and surface tension of methane-nitrogen solutions: 1. Experiment [Electronic resource] / V. G. Baidakov, M. N. Khotienkova, V. N. Andbaeva, A. M. Kaverin // Fluid Phase Equilibria. - 2011. - Vol.301, №1. - P67-72 Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
B 74 Boltachev, G. Sh. The thermodynamic properties of nitrogen, argon, oxygen, and their mixtures in the region of the liquid-gas phase transition / G. Sh. Boltachev, V. G. Baidakov // Russian Journal of Physical Chemistry. - 2006. - Vol.80, №4. - С. 501-504 Рубрики: ФИЗИКА Кл.слова (ненормированные): EQUATION OF STATE -- PRESSURES -- MPA Аннотация: A procedure for constructing the equation of state for metastable and labile regions in the liquid gas phase transition is suggested. A consistent description of p, rho, T, and caloric properties was obtained. The spinodals of both pure fluids and their mixtures were located |
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 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 |
S 34 Schmelzer, J. W. P. Kinetics of boiling in binary liquid–gas solutions: Comparison of different approaches / J. W. P. Schmelzer, V. G. Baidakov, G. Sh. Boltachev // Journal of Chemical Physics. - 2003. - Vol.119, №12. - С. 6166-6183 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL CLUSTER -- GIBBS' METHOD -- VAN-DER-WAALS 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 (employing the capillarity approximation), the van der Waals–Cahn and Hilliard and a newly developed modified Gibbs’ approach—is given in application to phase formation in multicomponent systems. As an example, processes of boiling in binary liquid–gas solutions, in particular, in nitrogen–helium mixtures are investigated. In addition to the work of critical cluster formation, the bulk properties of the critical bubbles, 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 shown that latter two mentioned methods (the van der Waals–Cahn and Hilliard and the modified Gibbs’ approach) lead, in the determination of the work of critical cluster formation, to qualitatively and widely even quantitatively equivalent results. As one of the more general consequences from the present analysis, it has been proven that the modified Gibbs’ approach represents a highly effective tool for the determination of the work of formation of clusters or bubbles of critical sizes not only for one-component and quasibinary systems, discussed earlier, but for phase formation in multicomponent systems of, in general, arbitrary numbers of components as well. It is shown that the modified Gibbs’ approach is preferable as compared with Gibbs’ original treatment not only due to its advantages with respect to an appropriate determination of the properties of clusters of critical sizes, but also from general theoretical considerations. In the limit of large sizes of the critical clusters, both approaches—Gibbs’ original treatment and the modified or generalized Gibbs’ approach—lead to equivalent results |
C 73 Comparison of thermophysical properties for oil/refrigerant mixtures by use of the pulse heating method / P. V. Skripov, A. A. Starostin, D. V. Volosnikov, V. P. Zhelezny // International Journal of refrigeration. - 2003. - Vol.26, №6. - С. 721-728 Рубрики: ФИЗИКА Кл.слова (ненормированные): REFRIGERANT -- LUBRICANT -- MIXTURES Аннотация: The method of pulse heating for the study of thermophysical properties for oil/refrigerant solutions in a wide temperature range and for monitoring of an actual state of these systems has been developed. The regimes of linear heating and thermostabilization of the superheated probe are applied for solving our task. The objects of study are as follows: synthetic oils Mobil EAL Arctic 22, PLANETELF ACD22, XMPA, and solutions of carbon dioxide in these oils. The upper boundary, with respect to temperature, of the two-phase equilibrium region including the vicinity of the liquid–vapour critical curve of these systems, gas solubility in oils at various temperatures, short-time thermostability, and thermal conductivity of oils are considered. Inclusion of the thermally unstable states of a substance in investigation allows one to essentially extend the set of compared data |
V 76 Vitrification of liquid inclusions in hcp 3He-4He crystal: The role of an intermediate bcc phase [Electronic resource] / N. P. Mikhin, A. P. Birchenko, A. P. Neoneta, E. Y. Rudavskii, V. G. Baidakov // Journal of Low Temperature Physics. - 2014. - Vol.175, № 1-2. - 154-159. . - Bibliogr. : p. 159 (11 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): NMR -- RELAXATION TIMES -- SOLID HELIUM Аннотация: The phase structure of the rapidly quenched solid helium samples is studied by the NMR technique in dilute 3He-4He mixtures at 1.35-1.8 K. The pulse NMR method is used to measure the spin-lattice and spin-spin relaxation times for all coexisting phases. An additional spin-lattice relaxation process is found just before vitrification of the liquid inclusions in hcp matrix. The relaxation rate of the new process coincides with that of bcc solid. It has been found that the new relaxation process is observed only in the temperature region of the phase diagram where an equilibrium bcc phase exists. After the liquid inclusions vitrification has been completed, the contribution from the bcc phase is not detected. The spin-lattice relaxation times in all of coexisting phases are discussed \\\\expert2\\nbo\\Journal of Low Temperature Physics\\2014, v.175, p. 154-159.pdf |
Б 79 Болтачев, Г. Ш. Термодинамические свойства азота, аргона, кислорода и их смесей в области фазового перехода жидкость-газ [] = The thermodynamic properties of nitrogen, argon, oxygen, and their mixtures in the region of the liquid-gas phase transition / Г. Ш. Болтачев, В. Г. Байдаков // Журнал физической химии. - 2006. - V. 80, N 4. - 594-597: рис., табл. - Библиогр: с. 597 (9 назв.) . - ISSN 0044-4537 Рубрики: ФИЗИКА Кл.слова (ненормированные): ФАЗОВЫЙ ПЕРЕХОД ЖИДКОСТЬ-ГАЗ -- МЕТАСТАБИЛЬНЫЕ ОБЛАСТИ -- ЛАБИДЬНЫЕ ОБЛАСТИ -- спинодали -- ОБЛАСТИ ЛАБИЛЬНЫЕ -- ОБЛАСТИ МЕТАСТАБИЛЬНЫЕ Аннотация: Предложена процедура построения уравнения состояния для метастабильных и лабильных областей при переходе жидкость-газ. Достигнуто согласованное описание р,Т и калорических свойств. Локализованы положения спинодалей как чистых флюидов, так и их смесей |
A 10 A computer study of the absorption of infrared radiation by systems of molecular clusters [Текст] / A. N. Novruzov, V. N. Chukanov, O. R. Rakhmanova, A. E. Galashev // High Temperature. - 2006. - Vol. 44, № 6. - С. 932-940 Рубрики: ФИЗИКА Кл.слова (ненормированные): MOLECULAR CLASTERS Аннотация: The method of molecular dynamics is used to investigate the process of absorption of N2O and CH4 molecules by water clusters and to determine the frequency spectra of permittivity for systems consisting of clusters mixed in different ratios, namely, (H2O)n, (N2O)i(H2O)10, and (CH4)i(H2O)10. IR-radiation absorption spectra for these systems are calculated and analyzed; the radiation power scattered by these systems and the tangent of dielectric loss angle are determined. The inclusion of anharmonicity of phonon oscillation makes it possible to explain the origin of characteristic frequencies appearing in IR spectra of mixtures of cluster systems. The capture of molecules of greenhouse gases by an ultradisperse aqueous medium affects the ability of this medium to absorb terrestrial radiation, i.e., reduces the greenhouse effect. \\\\Expert2\\NBO\\High Temperature\\2006, v.44, p.932.pdf |
S 91 Sulla, I. I. Liquid-vapor interface in argon-crypton system [] : 2. Description within Van-der-Waals capillarity theory / I. I. Sulla, V. G. Baidakov // Zhurnal Fizicheskoi Khimii. - 1994. - V.68, N1. - С. 67-70 Рубрики: ФИЗИКА Кл.слова (ненормированные): INTERFACE LIQUID-VAPOR -- SYSTEM ARGON-KRYPTON -- ARGON -- Ar -- KRYPTON -- THEORY VAN-der-WAALS -- THEORY CAPILLARITY -- MIXTURES -- SURFACE TENSION |
S 66 Skripov, V. P. Thermodynamic Similarity of Phase-Separating Binary-Liquid Mixtures Having an Upper Critical-Temperature [] / V. P. Skripov, M. Z. Faizullin // Journal of Chemical Thermodynamics. - 1989. - V.21, Is.7. - С. 687-700 Рубрики: ФИЗИКА Кл.слова (ненормированные): PHASE-SEPARATIONS |
C 20 Capillary constant and surface tension of methane-nitrogen solutions: 1. Experiment [Electronic resource] / V. G. Baidakov, M. N. Khotienkova, V. N. Andbaeva, A. M. Kaverin // Fluid Phase Equilibria. - 2011. - Vol.301, №1. - P67-72 Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
B 74 Boltachev, G. Sh. The thermodynamic properties of nitrogen, argon, oxygen, and their mixtures in the region of the liquid-gas phase transition / G. Sh. Boltachev, V. G. Baidakov // Russian Journal of Physical Chemistry. - 2006. - Vol.80, №4. - С. 501-504 Рубрики: ФИЗИКА Кл.слова (ненормированные): EQUATION OF STATE -- PRESSURES -- MPA Аннотация: A procedure for constructing the equation of state for metastable and labile regions in the liquid gas phase transition is suggested. A consistent description of p, rho, T, and caloric properties was obtained. The spinodals of both pure fluids and their mixtures were located |
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 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 |
S 34 Schmelzer, J. W. P. Kinetics of boiling in binary liquid–gas solutions: Comparison of different approaches / J. W. P. Schmelzer, V. G. Baidakov, G. Sh. Boltachev // Journal of Chemical Physics. - 2003. - Vol.119, №12. - С. 6166-6183 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL CLUSTER -- GIBBS' METHOD -- VAN-DER-WAALS 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 (employing the capillarity approximation), the van der Waals–Cahn and Hilliard and a newly developed modified Gibbs’ approach—is given in application to phase formation in multicomponent systems. As an example, processes of boiling in binary liquid–gas solutions, in particular, in nitrogen–helium mixtures are investigated. In addition to the work of critical cluster formation, the bulk properties of the critical bubbles, 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 shown that latter two mentioned methods (the van der Waals–Cahn and Hilliard and the modified Gibbs’ approach) lead, in the determination of the work of critical cluster formation, to qualitatively and widely even quantitatively equivalent results. As one of the more general consequences from the present analysis, it has been proven that the modified Gibbs’ approach represents a highly effective tool for the determination of the work of formation of clusters or bubbles of critical sizes not only for one-component and quasibinary systems, discussed earlier, but for phase formation in multicomponent systems of, in general, arbitrary numbers of components as well. It is shown that the modified Gibbs’ approach is preferable as compared with Gibbs’ original treatment not only due to its advantages with respect to an appropriate determination of the properties of clusters of critical sizes, but also from general theoretical considerations. In the limit of large sizes of the critical clusters, both approaches—Gibbs’ original treatment and the modified or generalized Gibbs’ approach—lead to equivalent results |
C 73 Comparison of thermophysical properties for oil/refrigerant mixtures by use of the pulse heating method / P. V. Skripov, A. A. Starostin, D. V. Volosnikov, V. P. Zhelezny // International Journal of refrigeration. - 2003. - Vol.26, №6. - С. 721-728 Рубрики: ФИЗИКА Кл.слова (ненормированные): REFRIGERANT -- LUBRICANT -- MIXTURES Аннотация: The method of pulse heating for the study of thermophysical properties for oil/refrigerant solutions in a wide temperature range and for monitoring of an actual state of these systems has been developed. The regimes of linear heating and thermostabilization of the superheated probe are applied for solving our task. The objects of study are as follows: synthetic oils Mobil EAL Arctic 22, PLANETELF ACD22, XMPA, and solutions of carbon dioxide in these oils. The upper boundary, with respect to temperature, of the two-phase equilibrium region including the vicinity of the liquid–vapour critical curve of these systems, gas solubility in oils at various temperatures, short-time thermostability, and thermal conductivity of oils are considered. Inclusion of the thermally unstable states of a substance in investigation allows one to essentially extend the set of compared data |
V 76 Vitrification of liquid inclusions in hcp 3He-4He crystal: The role of an intermediate bcc phase [Electronic resource] / N. P. Mikhin, A. P. Birchenko, A. P. Neoneta, E. Y. Rudavskii, V. G. Baidakov // Journal of Low Temperature Physics. - 2014. - Vol.175, № 1-2. - 154-159. . - Bibliogr. : p. 159 (11 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): NMR -- RELAXATION TIMES -- SOLID HELIUM Аннотация: The phase structure of the rapidly quenched solid helium samples is studied by the NMR technique in dilute 3He-4He mixtures at 1.35-1.8 K. The pulse NMR method is used to measure the spin-lattice and spin-spin relaxation times for all coexisting phases. An additional spin-lattice relaxation process is found just before vitrification of the liquid inclusions in hcp matrix. The relaxation rate of the new process coincides with that of bcc solid. It has been found that the new relaxation process is observed only in the temperature region of the phase diagram where an equilibrium bcc phase exists. After the liquid inclusions vitrification has been completed, the contribution from the bcc phase is not detected. The spin-lattice relaxation times in all of coexisting phases are discussed \\\\expert2\\nbo\\Journal of Low Temperature Physics\\2014, v.175, p. 154-159.pdf |