B 93 Bulanov, N. V. Mode of Bubble Boiling of Emulsion with a Low-Boiling Dispersed Phase [Text] / N. V. Bulanov, B. M. Gasanov, V. G. Baidakov // Heat Transfer Research. - 2002. - V. 33, N 3-4. - P166-168 . - ISSN 1064-2285 Рубрики: ФИЗИКА Кл.слова (ненормированные): КИПЕНИЕ ПУЗЫРЬКОВОЕ -- ПУЗЫРЬКОВОЕ КИПЕНИЕ -- ЭМУЛЬСИИ -- ДИСПЕРСНЫЕ ФАЗЫ -- ФАЗЫ ДИСПЕРСНЫЕ -- НИЗКОКИПЯЩИЕ ФАЗЫ -- ФАЗЫ НИЗКОКИПЯЩИЕ -- ТЕПЛОПЕРЕНОС -- ЖИДКОСТИ Аннотация: The results of the experimental investigations on the heat transfer of thin wires with water/oil and ether/water emulsions are given. The temperature of normal oil boiling is not lower than 340°C. A considerable delay in the crisis of bubble boiling is obtained for both emulsions, and is particularly noticeable for the ether/water emulsion. In the latter case the coefficient of connective heat transfer and the density of heat flux substantially exceed the corresponding values for pure initial liquids in the entire investigated range of temperatures (from 20 to 230°C) and pressures (from 0.1 to 3.6 MPa) |
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 |
F 17 Faizullin, M. Z. Lines of Some Photoorganic Substance Melting at Pressures up to 230 MPA [] / M. Z. Faizullin // Zhurnal Fizicheskoi Khimii. - 1985. - V.59, Is.1. - С. 245-246 Рубрики: ФИЗИКА Кл.слова (ненормированные): PHOTOORGANIC SUBSTANCE |
F 17 Faizullin, M. Z. The (T, p, x) surface of phase separation of [(1 - x)H2O + x(CH3)(CH3(CH2)4 )2PO] in the vicinity of the line of the lower critical solution temperatures at pressures up to 230 MPa / M. Z. Faizullin, V. P. Skripov // Journal of Chemical Thermodynamics. - 1994. - Vol. , № 11. - С. 1167-1172 Рубрики: ФИЗИКА Кл.слова (ненормированные): PHASE SEPARATION -- CRITICAL SOLUTION Аннотация: The (T, p, x) surface of (liquid + liquid) phase equilibrium has been investigated in the vicinity of the line of lower critical solution points of [(1 - x)H2O + x (CH3)CH3(CH2)42PO]. Measurements were carried out in a high-pressure optical chamber at pressures p in the range from 0.1 MPa to 230 MPa. The behaviour of critical exponents for (p, x) and (T, x) phase-equilibrium diagrams: T and p, respectively, has been studied along the critical line and at the double critical point (DCP) with coordinates PD = 127 MPa and TD = 296.5 K. The exponent p retains its value along the line of critical points, including the double critical point; T increases anomalously with an approach to the DCP???????? |
F 17 Faizullin, M. Z. The phase separation of water + methyl-di(n-amyl)phosphynoxide at pressure up to 230 MPa / M. Z. Faizullin, V. P. Skripov // Process Technology Proceedings . - 1996. - Vol. 12. - С. 481-485 Рубрики: ФИЗИКА Кл.слова (ненормированные): WATER -- PHASE-SEPARATIONS -- PRESSURE EFFECT |
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 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 |
B 16 Baidakov, V. G. Superheating of liquid xenon in metal tubes [Electronic resource] / V. G. Baidakov, A. M. Kaverin // Journal of Chemical Physics. - 2009. - Vol.131, №6. - Artical Number 064708 Рубрики: ФИЗИКА Кл.слова (ненормированные): LINE-TENSION -- SURFACE TENSION -- NUCLEATION Аннотация: The method of measuring the lifetime has been used to investigate the kinetics of spontaneous boiling-up of superheated xenon in copper tubes. In experiments the temperature dependence of the mean lifetime has been determined at pressures of 1.48 and 1.98 MPa. The data obtained have been compared with homogeneous nucleation theory. It has been found that experimental values of the attainable superheating temperature and the derivative (partial derivative ln J/partial derivative T)(p) are systematically lower than their theoretical values. A description of experimental data in the framework of heterogeneous nucleation theory has shown that for the agreement of theory and experiment with the use of a macroscopic model of nucleation on a smooth surface it is necessary to take the value of the equilibrium contact angle theta(0) equal to 70 degrees, which is not a characteristic for a xenon-metal system. Taking into account the contribution of the energy of the three-phase contact solid wall-liquid-gas in a microscopic nucleation model makes it possible to reconcile heterogeneous nucleation theory and experimental data at a contact angle theta(0) close to zero, with the linear tension taken equal to -6x10(-12) J/m and the microscopic contact angle theta(*)similar or equal to 57 degrees. The number of weakened sites, on which bubbles may form, is always smaller than the number of molecules adjacent to the solid wall \\\\Expert2\\nbo\\Journal of Chemical Physics\\2009, v.131, p.064708.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 |
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 |
C 20 Capillary Constant of a Xenon–Helium Solution [Electronic resource] / V. G. Baidakov, A. M. Kaverin, V. N. Andbaeva, M. N. Khotienkova // Journal of Chemical & Engineering Data. - 2011. - Vol.56, №11. - P4123-4125 Рубрики: ФИЗИКА Кл.слова (ненормированные): CAPILLARY METHOD -- XENON–HELIUM SOLUTION Аннотация: The differential capillary method has been used to measure the capillary constant of a xenon–helium solution. Experiments have been conducted in the temperature range from (165 to 267) K at pressures up to 4 MPa. An equation approximating the baric dependence of the capillary constant has been suggested \\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2011, v.56, p. 4123-4125.pdf |
S 94 Surface tension of an ethane–nitrogen solution. 1: Experiment and thermodynamic analysis of the results [Electronic resource] / V. G. Baidakov, A. M. Kaverin, M. N. Khotienkova, V. N. Andbaeva // Fluid Phase Equilibria. - 2012. - Vol.328. - P13-20 Рубрики: ФИЗИКА Кл.слова (ненормированные): SURFACE TENSION -- CAPILLARY CONSTANT -- ETHANE–NITROGEN SOLUTION Аннотация: The differential variation of the method of capillary rise has been employed to measure the capillary constant and calculate the surface tension of ethane–nitrogen solutions. Experiments have been conducted in the temperature range from 93.15 K to 283.15 K at pressures up to 4 MPa. The (p, T)-projection of the line of three-phase liquid–liquid–vapor equilibrium and the surface tension at a liquid–vapor interface close to this line have been determined. Equations are developed which describe the dependence of the capillary constant and the surface tension on the temperature, pressure, and composition of the liquid phase. Experimental data on the surface tension are analyzed in the framework of thermodynamic m \\\\Expert2\\nbo\\Fluid Phase Equilibria\\2012, v.328, p. 13-20.pdf |
B 16 Baidakov, V. G. Nucleation in Liquid Ethane with Small Additions of Metha [Electronic resource] / V. G. Baidakov, A. M. Kaverin, A. S. Pankov // Journal of Physical Chemistry C. - 2012. - Vol.116, №38. - P20458-20464 Рубрики: ФИЗИКА Кл.слова (ненормированные): LIQUID -- SPONTANEOUS BOILING-UP -- ETHANE–METHANE SOLUTIONS Аннотация: The method of measuring the lifetime of a liquid in a metastable (superheated) state has been used to investigate the kinetics of spontaneous boiling-up of ethane–methane solutions. The temperature dependence of the solution mean lifetime has been traced at two values of methane concentration (2.1 and 6.0 mol %) and two pressures (1.0 and 1.6 MPa). The results of experiments are compared with classical homogeneous nucleation theory. For pure ethane at small (<8.9 s) lifetimes, one can observe a systematic “under-heating” (0.5–0.7 K) of the solution against theoretical values of the limiting superheating temperature. Dissolution of 6 mol % of methane in ethane results in a solution “superheating” of 0.7 K in excess of the theoretical value. The slopes of experimental curves at small (<8.9 s) lifetimes are in satisfactory agreement with theory. When the mean lifetimes exceed the value of 8.9 s, one can observe considerable deviations of experimental curves from theoretical lines. The discrepancies are discussed in the context of models of heterogeneous and initiated nuc \\\\Expert2\\nbo\\Journal of Physical Chemistry C\\2012, v. 116, p.20458.pdf |
B 16 Baidakov, V. G. Surface tension of ethane-methane solutions: 1. Experiment and thermodynamic analysis of the results [Electronic resource] / V. G. Baidakov, A. M. Kaverin, M. N. Khotienkova // Fluid Phase Equilibria. - 2013. - Vol.356. - P90-95. - Bibliogr. : p. 95 (21 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): ADSORPTION -- CAPILLARY CONSTANT -- SURFACE TENSION Аннотация: The paper presents the results of measuring the capillary constant a2 and calculating the surface tension σ of ethane-methane solutions. Experimental data have been obtained in the temperature range from 93.15 to 283.15K at pressures from that of saturated vapors of pure ethane to 4MPa. Equations that approximate the temperature, pressure and concentration dependences of a2 and σ are suggested. The concentration dependence of the surface tension is described in the framework of models of an ideal and a regular solution. The relative adsorption has been calculated \\\\expert2\\NBO\\Fluid Phase Equilibria\\2013, v.356, p. 90-95.pdf |
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 |
P 34 Pavlov, P. A. Dynamics of vapor film formation upon rapid superheating of liquid [Electronic resource] / P. A. Pavlov, V. E. Vinogradov // High Temperature. - 2010. - Vol.48, №5. - P683-690. - Bibliogr. : p. 690 (18 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): VAPOR FILM -- SUPERHEATING OF LIQUID -- DYNAMICS Аннотация: The formation of a vapor film on a heater in the modes of rapid near-wall superheating of liquid at positive and negative pressures is considered. A model of this phenomenon and a technique for calculating the vaporization front velocity are proposed. Tests of this model in experiments with n-heptane at pressures from −2 to +0.2 MPa and heating rates of ∼0.5 K/μs showed a significant effect of capillary forces on the dynamics of vapor film form \\\\expert2\\NBO\\High Temperature\\2010, v. 48, N 5, p.683.pdf |
V 70 Vinogradov, V. E. Cavitation strength of liquids with large molecules [Electronic resource] / V. E. Vinogradov, P. A. Pavlov // International Journal of Modern Physics B. - 2013. - №2. - P1-10 Рубрики: ФИЗИКА Кл.слова (ненормированные): CAVITATION STRENGTH -- HOMOGENEOUS NUCLEATION THEORY Аннотация: The cavitation strength of liquids has been studied at atmospheric pressure by applying tensile stress pulses of duration up to 3 μs and amplitude up to 20 MPa within the temperature range from room temperature to the temperature of explosive boiling-up of the liquid. At high temperatures, where in absolute value the tensile strength does not exceed 1-2 times the critical pressure, agreement between classical nucleation theory and experiment is observed within the experimental error. With a decrease of the temperature the tensile strength of the liquid increases, but the experimental values of the breaking strength are lower than those predicted from theory. The dependence of the degree of discrepancy between theory and experiment on the number of atoms in the molecules of the liquids investigated is shown |
B 16 Baidakov, V. G. Thermodynamic properties of metastable liquefied inert gases: Part 2. P, T-properties of superheated krypton [Electronic resource] / V. G. Baidakov, T. A. Gurina // Physica B: Condenced Matter. - 1989. - Vol.160, №2. - С. 221-230 Рубрики: ФИЗИКА Кл.слова (ненормированные): KRYPTON -- INERT GASES -- THERMODYNAMIC PROPERTIES Аннотация: The paper presents the results of investigations of the P, ϱ, T-properties of krypton in stable and metastable phase states. Experimental data have been obtained in a temperature range from 150 to 200 K and pressure range from 5.3 MPa to pressures close to the boundary of spontaneous boiling of superheated liquids. The method of pycnometry was used to measure orthobaric densities (116–160 K). The problem of the equation of state and stability boundary of metastable systems is discussed. An equation of state for the superheated liquid has been obtained in the framework of the mean-field theory and thermodynamic perturbation theory. The spinodal has been approximated |