B 16 Baidakov, V. G. Measurement of ultrasonic speed in stable and metastable liquid methane [Text] / V. G. Baidakov, A. M. Kaverin, V. P. Skripov // Journal of Chemical Thermodynamics. - 1982. - V. 14, N 6. - P1003-1010 Рубрики: ФИЗИКА Кл.слова (ненормированные): СКОРОСТЬ СВЕРХЗВУКОВАЯ -- СВЕРХЗВУКОВАЯ СКОРОСТЬ -- МЕТАН СТАБИЛЬНЫЙ -- СТАБИЛЬНЫЙ МЕТАН -- МЕТАН МЕТАСТАБИЛЬНЫЙ -- МЕТАСТАБИЛЬНЫЙ МЕТАН -- МЕТАН ЖИДКИЙ -- ЖИДКИЙ МЕТАН -- ТЕПЛОФИЗИКА -- МЕТАН |
B 16 Baidakov, V. G. Measurement of Ultrasonic Speed in Stable and Metastable Liquid Methane [Text] / V. G. Baidakov, A. M. Kaverin, V. P. Skripov // Journal of Chemical Thermodynamics. - 1982. - V.14, Is.11. - P1003-1010 Рубрики: ФИЗИКА Кл.слова (ненормированные): СКОРОСТЬ УЛЬТРАЗВУКА -- МЕТАН ЖИДКИЙ -- МЕТАН СТАБИЛЬНЫЙ -- МЕТАН МЕТАСТАБИЛЬНЫЙ |
B 16 Baidakov, V. G. Measurement of ultrasonic speed in stable and metastable liquid methane [Text] / V. G. Baidakov, A. M. Kaverin, V. P. Skripov // Journal of Chemical Thermodynamics. - 1982. - V. 14, N 6. - P1003-1010 Рубрики: ФИЗИКА Кл.слова (ненормированные): СКОРОСТЬ СВЕРХЗВУКОВАЯ -- СВЕРХЗВУКОВАЯ СКОРОСТЬ -- МЕТАН СТАБИЛЬНЫЙ -- СТАБИЛЬНЫЙ МЕТАН -- МЕТАН МЕТАСТАБИЛЬНЫЙ -- МЕТАСТАБИЛЬНЫЙ МЕТАН -- МЕТАН ЖИДКИЙ -- ЖИДКИЙ МЕТАН -- ТЕПЛОФИЗИКА -- МЕТАН |
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 |
B 16 Baidakov, V. G. The liquid-gas interface of oxygen-nitrogen solutions [Text] / V. G. Baidakov, A. M. Kaverin, V. N. Andbaeva // Fluid Phase Equilibria. - 2008. - Vol. 270, № 1-2. - P116-120 Рубрики: ФИЗИКА Кл.слова (ненормированные): SURFACE TENSION -- CAPILLARY CONSTANT -- OXYGEN-NITROGEN SOLUTIONS Аннотация: The capillary method of surface tension measurement has been used to measure the surface tension of oxygen–nitrogen solutions in the temperature range from 80 to 132 K. At temperatures below the nitrogen critical temperature (Tc = 126.2 K) the capillary constant and the surface tension of solutions are smaller than their additive values and vary linearly with the temperature. Experimental data are compared with the results of calculating the surface tension by the theories of Pinnes and Rowlinson. \\\\Expert2\\nbo\\Fluid Phase Equilibria\\2008, v.270, p.116.pdf |
A 71 Arc current fluctuation power spectra in the system of a solid metal electrode and carbonate melt [Текст] / A. V. Reshetnikov, V. N. Sannikov, V. N. Skokov, V. P. Koverda // Journal of Applied Mechanics and Technical Physics. - 2007. - Vol. 48, № 1. - С. 7-10 Рубрики: ФИЗИКА Кл.слова (ненормированные): SOLID METALS Аннотация: Arc current fluctuations between a solid metal electrode and a liquid melt of alkaline carbonates at atmospheric pressure are measured. Arc current fluctuation power spectra are determined from the measurement data. It is shown that the fluctuation power is inversely proportional to the frequency (1/f-fluctuations). The fluctuations have a normal Gaussian distribution. The observed 1/f fluctuations exhibit scale invariance. \\\\Expert2\\NBO\\Journal of Applied Mechanics and Technical Physics\\2007, v. 48, N. 1, p.7.pdf |
N 64 Nikitin, E. D. Vapor-liquid critical properties of squalane measured by the pulse-heating technique [Текст] / E. D. Nikitin, A. P. Popov // Fluid Phase Equilibria. - 2005. - Vol. 237, № 1-2. - С. 16-20 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL POINTS -- MEASUREMENT -- ALKANES Аннотация: The critical temperature and pressure of squalane (2,6,10,15,19,23-hexamethyltetracosane) have been measured using the pulse-heating method. Residence times are from 0.03 to 1 ms. The experimental critical properties are compared with the results of measurement by a flow method, computer-simulation data, and the values calculated by the group-contribution methods. The critical temperature of squalane is about 2.5% lower and the critical pressure is 10% higher than those of its linear isomer-n-triacontane. \\\\Expert2\\NBO\\Fluid Phase Equilibria\\2005. v.237, p.16.pdf |
N 64 Nikitin, E. D. Critical Properties of Thermally Unstable Substances: Measurement Technique, Some Results and Correlations [] / E. D. Nikitin // High Temperature. - 1998. - V.36, N2. - С. 322-337 Рубрики: ФИЗИКА Кл.слова (ненормированные): PROPERTIES CRITICAL -- SUBSTANCES THERMALLY UNSTABLE -- CORRELATION |
B 16 Baidakov, V. G. Measurement of ultrasonic speed in stable and metastable liquid methane [] / V. G. Baidakov, A. M. Kaverin, V. P. Skripov // Journal of Chemical Thermodynamics. - 1982. - V. 14, N 6. - С. 1003-1010 Рубрики: ФИЗИКА Кл.слова (ненормированные): SPEED ULTRASONIC -- METHANE STABLE -- METHANE METASBLE -- METHANE LIQUID |
B 16 Baidakov, V. G. Boiling-up of liquid argon at high superheatings under the impact of weak ultrasonic fields / V. G. Baidakov, A. M. Kaverin, V. N. Andbaeva // Thermophysics and Aeromtchanics. - 2011. - Vol.18, №1. - С. 31-36 Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATION -- KRYPTON Аннотация: The technique of lifetime measurement for metastable liquid and continuous depressurization technique were applied for study of kinetics of spontaneous cavitation in superheated liquid argon under impact of weak ultrasonic fields. It was demonstrated that acoustic cavitation may occur through the mechanism of homogeneous generation of vapor phase or through "swinging" of vapor bubbles generated by high-energy particles and/or other kinds of initiative factors. The thresholds of acoustic cavitation are described by the theory of homogeneous nucleation |
B 16 Baidakov, V. G. Boiling-up of superheated liquid argon in an acoustic field / V. G. Baidakov, A. M. Kaverin // Journal of Physics : Condensed Matter. - 2009. - Vol.21, №46. - Article Number 465103 Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATION -- STATE Аннотация: The method of lifetime measurement has been used to investigate spontaneous cavitation kinetics in superheated liquid argon in weak acoustic fields. It is shown that acoustic cavitation may proceed both by the mechanism of homogeneous nucleation of the vapor phase and by way of 'build-up' of vapor bubbles generated by high-energy particles or the action of some other external factor. Acoustic cavitation thresholds are adequately described by homogeneous nucleation theory |
B 16 Baidakov, V. G. Attainable superheating of solutions of cryogenic liquids / V. G. Baidakov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 109-118 Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
N 64 Nikitin, E. D. Critical point measurement of ferrocene and some of its derivatives [Электронный ресурс] / E. D. Nikitin, A. P. Popov // Fluid Phase Equilibria. - 2012. - Vol.324. - P13-16 Рубрики: ФИЗИКА Кл.слова (ненормированные): 1-ACETYLFERROCENE -- BENZOYLFERROCENE -- FERROCENE Аннотация: The critical temperatures and the critical pressures of ferrocene, . n-butylferrocene, benzoylferrocene, and 1-acetylferrocene have been measured. All the compounds studied begin to decompose at temperatures below their critical points. A method of pulse heating applicable to thermally unstable compounds has been used. Residence times were from (0.03 to 1.0). ms, which resulted in little decomposition of the substances in the course of measuring. The contributions of the groups Fe. CH and Fe. C for the estimation of the critical properties of ferrocene derivatives by the method of Marrero and Gani have been determined from the experimental data |
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 |
E 97 Experimental determination of superheated liquids boiling-up expectancy time probabilities distribution [Electronic resource] / E. V. Lipnyagov, S. A. Perminov, G. V. Ermakov, B. M. Smolyak // Thermophysics and Aeromtchanics. - 2009. - Vol.16, №4. - P627-633. - Bibliogr. : p. 633 (16 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): LIQUID -- N-PENTANE -- BOILING-UP Аннотация: Results of statistical measurement of n-pentane and n-hexane boiling-up expectancy time near the boundary of attainable superheating are presented. Experiments were carried out in glass capillaries with various volumes of superheated liquid. Several samples with the volume from 100 to 200 measurements of life time for preset metastable state have been obtained (p, T = const). Their histograms contain small empty initial section, maximum and long “tail” in the area of large times. Non-monotonous dependence of probability distribution density on time proves non-stationary character of the random process resulting in the production of supercritical embryo. Two simple approximations of non-stationary nucleation flow well describing experimental data have been considered. For exponential distribution, the probabilities of experimentally found peculiarities of boiling-up expectancy time distribution density have been evaluated; they prove incompatibility of this distribution with the experimental one \\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 4. P. 627-633.pdf |
C 89 Critical temperatures and pressures of straight-chain alkanediols (C3 to C12) [Electronic resource] / E. D. Nikitin, A. P. Popov, N. S. Bogatishcheva, V. A. Kuznetsov // Fluid Phase Equilibria. - 2013. - Vol.355. - P40-45. - Bibliogr. : p. 45 (30 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): ALKANEDIOLS -- CRITICAL PROPERTIES -- PULSE-HEATING METHOD Аннотация: The critical pressures pc and the critical temperatures Tc of diols with straight alkylchains HO(CH2)nOH and n=3, 4, 5, 6, 8, 9, 10, 12 have been measured. All the alkanediols studied decompose at near-critical temperatures. A pulse-heating method which allows measuring the critical properties of thermally unstable compounds has been used. The times of heating from the beginning of a pulse to the moment of reaching the critical temperature were from (0.03 to 0.46)ms. The short residence times provided little degradation of the substances in the course of the experiments. The uncertainties of the measurement of the critical properties of alkanediols are 0.04 pc and 0.015 Tc, where Tc is the absolute temperature. The critical properties obtained have been compared with the values measured earlier by various techniques. The experimental critical constants of alkanediols have also been compared with those calculated using the group-contribution methods of Lydersen, Wilson and Jasperson, and Marrero and Gani \\\\expert2\\NBO\\Fluid Phase Equilibria\\2013, v.355, p. 40-45.pdf |
O-66 Optical studies of the initial stage of spontaneous boiling-up / A. L Gurashkin, A. D. Yampol'skiy, A. A. Starostin, P. V. Skripov // Technical Physics Letters . - 2013. - Vol.39, №8. - С. 751-754. - Библиогр.: с. 754 (11 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): LIQUID BOILING-UP -- FIBER-OPTIC REFLECTOMETRY -- OPTICAL STUDIES Аннотация: Spontaneous liquid boiling-up is studied using the technique of fiber-optic reflectometry. The speed of the experimental technique (10 MS/s) and small dimensions of the measurement area (9 μm) have opened new possibilities for monitoring the initial stage of boiling-up. When using a double-probe scheme, the fact of measuring the prognostic signal at different times by two sensitive elements of the optical probes was discovered. Based on the experimental results, a hypothesis was formulated regarding the local character of the appearance of the perturbation source generating the observed signal in a superheated liquid. An estimate was obtained for the rate of perturbation propagation in a wide variation range of the degree of liquid superheating \\\\expert2\\NBO\\Technical Physics Letters (Письма в ЖТФ)\\2013, v. 39, N. 8, p.751.pdf |
B 16 Baidakov, V. G. Nucleation in ethane-nitrogen solutions. I. Homogeneous nucleation [Electronic resource] / V. G. Baidakov, A. S. Pankov // International Journal of Heat and Mass Transfer. - 2015. - Vol. 86. - С. 930-935. - Bibliogr. : p. 935 (32 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): CLASSICAL NUCLEATION THEORY -- METHOD OF LIFETIME MEASUREMENT -- ETHANE-NITROGEN SOLUTION Аннотация: The method of lifetime measurement is used to investigate the kinetics of spontaneous boiling-up of ethane-nitrogen solutions. Superheating temperatures Tn of solutions have been determined in experiments at pressure p = 1.0, 1.6 MPa and nitrogen concentration in ethane x = 0.5, 1.5 mol% in the nucleation rate range J = 1 × 104-2 × 108 s-1 m-3. At J > 3 × 106 s-1 m-3 one can observe a satisfactory agreement between experimental data and homogeneous nucleation theory with respect to the temperature dependence of the nucleation rate and a systematic disagreement in the superheating temperature. At x = 0.5 mol% attainable superheating temperatures achieved by experiment coincide within the experimental error with theoretical values, and at x = 1.5 mol% exceed them by approximately 1.7 K. It is shown that one possible reason of such "excess superheating" of a solution beyond the theoretical value of Tn may be the absence of adsorption equilibrium at the critical bubble-ambient solution interface \\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 86, p.930-935.pdf |
B 16 Baidakov, V. G. Surface tension of dimethyl ether in the temperature range 120–214 K [Electronic resource] / V. G. Baidakov, A. M. Kaverin, K. A. Grishina // Russian Journal of Physical Chemistry A. - 2015. - Vol. 89, № 5. - С. 782-785. - Bibliogr. : p. 785 (14 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): CAPILLARY CONSTANT -- DIMETHYL ETHER -- SURFACE TENSION Аннотация: The capillary constant a 2 was measured by the differential capillary method of surface tension measurement. The surface tension σ of dimethyl ether was calculated. The experiments were performed both above the triple point temperature (T t = 131.66 K) and below it in the range in which the coexisting liquid and gas are metastable. Equations that approximate the temperature dependences of a 2 and σ were suggested. The excess surface entropy and energy were determined. The surface entropy had a maximum at T ≈ 190 K. \\\\expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2015, V.89, N 1, p.782-785.pdf |