B 16 Baidakov, V. G. Surface tension of helium-oxygen and helium-ethane solutions [Text] / V. G. Baidakov, I. I. Sulla // International Journal of Thermophysics. - 1995. - V. 16, N 4. - P909-927 Рубрики: ФИЗИКА Кл.слова (ненормированные): НАТЯЖЕНИЕ ПОВЕРХНОСТНОЕ -- ПОВЕРХНОСТНОЕ НАТЯЖЕНИЕ -- РАСТВОРЫ -- ГЕЛИЙ-КИСЛОРОД -- ГЕЛИЙ-ЭТАН -- ГЕЛИЙ -- He (ГЕЛИЙ) -- КИСЛОРОД -- O (КИСЛОРОД) -- ЭТАН -- C2H6 -- ГАЗЫ -- зависимости температурные -- ТЕМПЕРАТУРНАЯ ЗАВИСИМОСТЬ -- ДАВЛЕНИЕ -- ТЕПЛОФИЗИКА Аннотация: На основе измерений высоты подъема в капиллярных трубках насыщенных газом растворов He-O2 и He-C2H6 определены их константы капиллярности а и поверхностное натяжение сигма. Измерения проведены в диапазоне от температуры замерзания раствора до 0,9Тс (Тс-критическая температура растворителя) при давлениях от давления насыщения до 5 МПа. предложены формулы, аппроксимирующие зависимости а от p и сигма от концепции. Полученные данные описываются теорией поверхностного слоя конечной толщины, мономолекулярное приближение не удовлетворительно даже ниже нормальной температуры кипения \\EXPERT2\NBO\International Journal of Thermophysics\1995, V.16, N 4, p.909.pdf |
B 16 Baidakov, V. G. The sugden parameter and the surface tension of solutions of helium on liquefied gases [Text] / V. G. Baidakov, I. I. Sulla // XI IUPAC Conference on Chemical Thermodynamics, Como, Italy, 1990, 26 - 31 Aug. - 1990. - P459 Рубрики: ФИЗИКА Кл.слова (ненормированные): НАТЯЖЕНИЕ ПОВЕРХНОСТНОЕ -- ПОВЕРХНОСТНОЕ НАТЯЖЕНИЕ -- РАСТВОРЫ ГЕЛИЯ -- ГАЗЫ ЖИДКИЕ -- ЖИДКИЕ ГАЗЫ -- ТЕПЛОФИЗИКА -- КОНФЕРЕНЦИИ -- ДОКЛАДЫ |
Б 18 Байдаков, В. Г. Достижимый перегрев жидких растворов гелий-кислород [] = Attainable Superheating of Helium-Oxygen Solutions / В. Г. Байдаков, А. М. Каверин // Теплофизика высоких температур. - 2000. - Т. 38, N6. - С. 886-894 Рубрики: ФИЗИКА Кл.слова (ненормированные): O2 -- He2 -- КИСЛОРОД -- ГЕЛИЙ -- ГЕЛИЙ-КИСЛОРОД -- ПЕРЕГРЕВ -- ПЕРЕГРЕВ ДОСТИЖИМЫЙ -- РАСТВОРЫ -- РАСТВОРЫ ЖИДКИЕ -- ЗАРОДЫШЕОБРАЗОВАНИЕ -- КИНЕТИКА ЗАРОДЫШЕОБРАЗОВАНИЯ -- РАСТВОРЫ ГАЗОНАСЫЩЕННЫЕ -- ДАВЛЕНИЕ -- КОНЦЕНТРАЦИЯ РАСТВОРА -- ЗАВИСИМОСТИ ТЕМПЕРАТУРНЫЕ -- ВРЕМЯ ЖИЗНИ РАСТВОРА -- СОСТОЯНИЕ МЕТАСТАБИЛЬНОЕ -- СОСТОЯНИЕ ПЕРЕГРЕТОЕ -- НУКЛЕАЦИЯ ГОМОГЕННАЯ -- РАЗМЕР ЗАРОДЫШЕЙ Аннотация: Представлены результаты экспериментальных исследований кинетики зародышеобразования в газонасыщенных растворах гелий-кислород. При фиксированных давлениях 1.171 и 1.667 МПа и нескольких значениях концентрации определены температурные зависимости среднего времени жизни раствора в метастабильном (перегретом) состоянии. Экспериментальные данные сопоставляются с теорией гомогенной нуклеации в макроскопическом приближении с учетом зависимости свойств зародышей от их размера |
К 12 Каверин, А. М. Поверхностное натяжение на границе растворов гелий-аргон и неое-аргон в интервале температур 108-140 К [] = Surface tension at the boundaries of helium-argon and neon-argon solutions at 108-140 K / А. М. Каверин, В. Н. Андбаева, В. Г. Байдаков // Журнал физической химии. - 2006. - V. 80, N 3. - 495-499: рис., табл. - Библиогр: с. 499 (16 назв.) . - ISSN 0044-4537 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОВЕРХНОСТНОЕ НАТЯЖЕНИЕ -- НАТЯЖЕНИЕ ПОВЕРХНОСТНОЕ -- ГЕЛИЙ-АРГОН -- НЕОН-АРГОН -- МЕТОД КАПИЛЛЯРНОГО ПОДНЯТИЯ -- АДСОРБЦИЯ Аннотация: Дифференциальным вариантом метода капиллярного поднятия в интервале температур 108-140 К при давлениях до 4 МПа измерена капиллярная постоянная и определено поверхностное натяжение растворов гелий-аргон и неон-аргон. Рассчитана адсорбция гелия и неона в межфазном слое раствора. |
B 16 Baidakov, V. G. Attainable Superheat of Argon-Helium, Argon-Neon Solutions [Text] / V. G. Baidakov, A. M. Kaverin, V. N. Andbaeva // Journal of Physical Chemistry B. - 2008. - Vol. 112, № 41. - P12973-12975 Рубрики: ФИЗИКА Кл.слова (ненормированные): ARGON Аннотация: The method of lifetime measurement has been used to investigate the kinetics of spontaneous boiling-up of superheated argonhelium and argon?neon solutions. Experiments were made at a pressure of p = 1.5 MPa and concentrations up to 0.33 mol% in the range of nucleation rates from 104 to 108 s1 m3. The homogeneous nucleation regime has been distinguished. With good agreement between experimental data and homogeneous nucleation theory in temperature and concentration dependences of the nucleation rate, a systematic underestimation by 0.250.34 K has been revealed in superheat temperatures over the saturated line attained by experiment as compared with theoretical values calculated in a macroscopic approximation. The revealed disagreement between theory and experiment is connected with the dependence of the properties of new-phase nuclei on their size. \\EXPERT2\NBO\Journal of Physical Chemistry B\2008, v.112, p.12973.pdf |
B 16 Baidakov, V. G. Nucleation in a superheated nitrogen-helium solution [] / V. G. Baidakov // Chemical Physics Letters. - 2008. - Vol. 462, № 4-6. - С. 201-204 Рубрики: ФИЗИКА Кл.слова (ненормированные): HELIUM Аннотация: The method of lifetime measurement has been used to investigate the nucleation of the vapor phase in a superheated liquid nitrogen–helium solution. Temperature dependences of the mean lifetime of a metastable solution have been obtained in experiments at pressures p = 0.5, 1.0 MPa and several values of the mixture concentration. The nucleation rate J has been calculated. It varied in experiments from 104 tо 108 s?1 m?3. The results of experiments are compared with homogeneous nucleation theory. The paper deals with the size effect on the surface tension of a nucleus and the work of its formation. \\\\Expert2\\nbo\\Chemical Physics Letters\\2008, v. 462, p.201.pdf |
S 46 Semenova, N. M. Boiling Kinetics of Superheated Liquid-HE-4 [] / N. M. Semenova, G. V. Ermakov // Journal of Low Temperature Physics. - 1989. - V.74, Is.1-2. - С. 119-131 Рубрики: ФИЗИКА Кл.слова (ненормированные): KINETICS OF BOILING -- HE-4 -- HELIUM -- HE-4 LIQUID -- HE-4 SUPERHEATED \\\\Expert2\\NBO\\Journal of Low Temperature Physics\\1989, v.74, p. 119.pdf |
S 46 Semenova, N. M. Experimental-Study of the Mean-Life of HE-4 in a Strongly Superheated State [] / N. M. Semenova, G. V. Ermakov // High Temperature. - 1986. - V.24, Is.5. - С. 653-656 Рубрики: ФИЗИКА Кл.слова (ненормированные): MEAN-LIFE -- He-4 -- HELIUM -- STATE STRONGLY -- STATE SUPERHEATED |
K 25 Kaverin, A. M. Surface tension at the boundaries of helium-argon and neon-argon solutions at 108-140 k / A. M. Kaverin, V. N. Andbaeva, V. G. Baidakov // Russian Journal of Physical Chemistry. - 2006. - Vol. 80, № 3. - С. 413-417 : ил. Рубрики: ФИЗИКА Кл.слова (ненормированные): HELIUM -- ARGON -- NEON |
B 16 Baidakov, V. G. The attainable superheating of nitrogen-helium solutions [Electronic resource] / V. G. Baidakov // Russian Journal of Physical Chemistry A. - 2009. - Vol.83, №10. - P1751-1756 Рубрики: ФИЗИКА Кл.слова (ненормированные): HOMOGENEOUS NUCLEATION -- OXYGEN -- KRYPTON Аннотация: The nucleation of the vapor phase in superheated nitrogen-helium liquid solutions was studied by lifetime measurements. The temperature dependences of the mean lifetime of metastable solutions were obtained at p = 0.5 and 1.0 MPa and several concentrations. The nucleation rate J was found to vary from 10(4) to 10(8) s(-1) m(-3). The adsorption of the high-volatility component on the metastable liquid-critical bubble boundary was shown to play a determining role in decreasing the temperature of the attainable solution super-heating as the solution concentration increased. The experimental data were compared with homogeneous nucleation theory. Systematic discrepancies were obtained; these discrepancies were related to the influence of the size effect on the surface tension of a nucleus and the work of its formation \\\\Expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2009, v. 83, N 10, p.1751.pdf |
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 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 |
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 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 |
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 |
B 16 Baidakov, V. G. Capillary constant and the surface tension for nitrogen-helium solutions / V. G. Baidakov, A. M. Kaverin // Russian Journal of Physical Chemistry A. - 2004. - Vol.78, №6. - С. 1000-1002 Рубрики: ФИЗИКА Кл.слова (ненормированные): LIQUID -- HELIUM -- NITROGEN |
B 16 Baidakov, V. G. Attainable Superheating of Liquid Helium–Oxygen Solutions / V. G. Baidakov, A. M. Kaverin // High Temperature. - 2000. - Vol.38, №6. - С. 852-859 Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATION -- THEORY OF HOMOGENEOUS NUCLEATION -- BOILING Аннотация: The results are given of experimental investigations of the kinetics of nucleation in gas-saturated helium-oxygen solutions. The temperature dependences of the mean lifetime of solution in the metastable (superheated) state are determined for fixed values of pressure of 1.171 and 1.667 MPa and for several values of concentration. The experimental data are compared with the theory of homogeneous nucleation in a macroscopic approximation with due regard for the dependence of the properties of the nuclei on their size. The dimensional effect is included within van der Waals' gradient expansion. The problems associated with the construction of the kinetic theory of boiling of gas-saturated solutions are discussed, and good agreement is ascertained between the experimental data and the theory of nucleation when the latter includes the dimensional effect |
B 16 Baidakov, V. G. Capillary constant and surface tension of methane-helium solution [Electronic resource] / V. G. Baidakov, K. A. Grishina // Fluid Phase Equilibria. - 2013. - Vol.354. - P245-249. - Bibliogr. : p. 249 (21 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): ADSORPTION -- CAPILLARY CONSTANT -- DIFFERENTIAL CAPILLARY METHOD Аннотация: The differential capillary method has been used to measure the capillary constant a2 of methane-helium solutions in the temperature range from 95 to 175K at pressures up to 4MPa. The surface tension γ and adsorption have been calculated from the obtained values of a2 employing, in addition, literature data on the density of the liquid and vapor phases of the respective solutions. Equations, which approximate the temperature, pressure and concentration dependences of a2 and γ, are proposed \\\\expert2\\NBO\\Fluid Phase Equilibria\\2013, v.354, p. 245-249.pdf |
K 46 Kinetics of nucleation during the bcc-hcp structural transition in solid helium [Electronic resource] / A. P. Birchenko, Y. O. Vekhov, N. P. Mikhin, E. Y. Rudavskii, V. G. Baidakov // Low Temperature Physics . - 2013. - Vol.39, №6. - P487-492. - Bibliogr. : p. 492 (19 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATION -- SOLID HELIUM -- KINETICS Аннотация: The nucleation kinetics of the hcp phase in the supercooled bcc phase of solid 4He and a 3He-4He solution containing 1% 3He is studied experimentally. Precision measurements of the pressure in the crystal are made as it is cooled along an isochore near the bcc-hcp phase equilibrium curve. The lifetime of the metastable bcc phase in 4He is found to have a complicated dependence on the level of supercooling which can be described in terms of two nucleation mechanisms-homogeneous and heterogeneous. The homogeneous mechanism occurs for the highly supercooled bcc phase in carefully annealed crystals, while the heterogeneous mechanism, for which the activation coefficients are several orders of magnitude lower than for the homogeneous mechanism, occurs with low supercooling. The influence of defects and impurities on the nucleation process is also studied. In unannealed (defective) 4He crystals the nucleation rate is found to have an enormous scatter, which is indicative of poor reproducibility from one crystal to another. For annealed samples of 3He-4He solution the nucleation kinetics data can be described only by the heterogeneous nucleation mechanism. \\\\expert2\\NBO\\Low Temperature Physics\\2013, v.39, N 6, p.487-492.pdf |
K 46 Kinetics of nucleation under bcc-hcp structural transition in solid helium [Electronic resource] / A. P. Birchenko, Y. O. Vekhov, N. P. Mikhin, E. Y. Rudavskii, V. G. Baidakov // Fizika Nizkikh Temperatur. - 2013. - Vol.39, №6. - P627-634. - Bibliogr. : p. 634 (16 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): METASTABLE PHASES -- NUCLEATION -- PHASE TRANSITIONS BCC-HCP Аннотация: An experimental study of the kinetics of formation of nuclei hcp phase in supercooled bcc phase of solid 4He and 3He-4He solution containing 1% 3He is realised. The method precision measurement of pressure crystal cooled along isochore near the line of phase equilibrium bcc-hcp is used. It's found that in 4He lifetime metastable bcc phase has a complex depend Ence on the magnitude of hypothermia, which can be described with the involvement of two mechanisms of nucleation - homogeneous and heterogeneous. It is shown that at large overcooling bcc phase of carefully annealed crystals homogeneous nucleation mechanism realized, and at low overcooling a heterogeneous mechanism realized, which is characterized by the values of activation coefficients several orders of magnitude less homogeneous. The effect of defects and impurities on the nucleation process is investigated. Revealed that in the unannealed (defective) 4He crystal nucleation rate shows huge variation in the values, indicating poor reproducibility from crystal to crystal. It's found that for the annealed samples 3He-4He data obtained on the nucleation kinetics can be described only by heterogeneous nucleation mechanism |
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 |
K 25 Kaverin, A. M. Attainable superheating of the oxygen-nitrogen-helium solutions [Electronic resource] / A. M. Kaverin, V. N. Andbaeva, V. G. Baidakov // Thermophysics and Aeromtchanics. - 2015. - Vol. 22, № 1. - С. 85-94. - Bibliogr. : p. 94 (19 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): ADDITIVE APPROXIMATION -- SOLUTIONS -- HOMOGENEOUS NUCLEATION Аннотация: Method of measuring the lifetime of the superheated liquid was used to determine temperatures of the limit superheating of the solution of oxygen-nitrogen-helium. The method of calculating the properties of this solution (temperature of limit superheating, saturated vapor pressure, and density) based on the data on the properties of solutions of oxygen-helium and nitrogen-helium was proposed. The surface tension of the solution of oxygen-nitrogen-helium was determined in a special experimen \\\\expert2\\nbo\\Thermophysics and Aeromechanics\\2015, V. 22, N 1. P. 85-94.pdf |