B 16 Baidakov, V. G. Acoustic Cavitation in a Highly Superheat Liquid [Text] / V. G. Baidakov, A. M. Kaverin, V. P. Skripov // Soviet Physics Acoustics-USSR. - 1981. - V.27, Is.5. - P387-390 Рубрики: ФИЗИКА Кл.слова (ненормированные): КАВИТАЦИЯ АКУСТИЧЕСКАЯ -- жидкости сильно перегретые |
V 70 Vinogradov, V. E. Explosive cavitation in superheated liquid argon [Text] / V. E. Vinogradov, P. A. Pavlov, V. G. Baidakov // Journal of Chemical Physics. - 2008. - Vol. 128, № 23. - P234508/1-234508/6 Рубрики: ФИЗИКА Кл.слова (ненормированные): ARGON Аннотация: The kinetics of explosive boiling-up of liquid argon has been investigated at negative pressures created by the reflection of a compression pulse 3–5 µs long from the free surface of a liquid by the method of liquid pulse heating on a thin platinum wire (with a rate of temperature increase of about 1 K/µs). The limiting superheats T* (stretches p*), the effective nucleation rate J*, and the derivative GT=(d ln J/dT)T=T* have been determined by experimental data on the thermal perturbation of a wire probe and the results of solution of the problem on the initial stage of explosive boiling-up of a liquid. The experimental data are compared with homogeneous nucleation theory. \\\\Expert2\\nbo\\Journal of Chemical Physics\\2008, v.128, p.234508.pdf |
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 |
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. Cavitation and crystallization in a metastable Lennard-Jones liquid at negative pressures and low temperatures [Electronic resource] / V. G. Baidakov, K. S. Bobrov, A. S. Teterin // Journal of Chemical Physics. - 2011. - Vol.135, №5. - P054512 Рубрики: ФИЗИКА Кл.слова (ненормированные): SOLID-LIQUIDS -- LIQUIDS -- LENNARD-JONES Аннотация: Molecular dynamics simulations have been used to investigate the kinetics of spontaneous cavitation and crystallization in a Lennard-Jones liquid at negative pressures in the temperature range where these processes compete with each other. The nucleation rate has been calculated in NVE and NpT ensembles by the method of mean lifetime and the transition interface sampling method with parallel path swapping. The data obtained have been used to determine in the framework of classical nucleation theory the value of the ratio of the solid–liquid and the liquid–void interfacial free energy for critical crystals and cavities and the values of their volumes at points where the cavitation rate of the liquid is equal to the rate of its crystallization \\\\Expert2\\nbo\\Journal of Chemical Physics\\2011, v.135, p.054512.pdf |
V 70 Vinogradov, V. E. Cavitation strength of water solutions / V. E. Vinogradov, P. A. Pavlov // Journal of Engineering Thermophysics. - 2003. - Vol.11, №4. - С. 353-363 Рубрики: ФИЗИКА Кл.слова (ненормированные): FLUID CONDITION -- CAVITATION -- WATER |
1/f Fluctuations under acoustic cavitation of liquids / V. N. Skokov, V. P. Koverda, A. V. Reshetnikov, A. V. Vinogradov // Physica A. - 2006. - Vol.364. - С. 63-69 Рубрики: ФИЗИКА Кл.слова (ненормированные): SELF-ORGANIZED CRITICALITY -- ACOUSTIC CAVITATION -- NONEQUILIBRIUM CONDITIONS Аннотация: A regime of a generation of fluctuations with 1/f power spectra under cavitation of liquids in an ultrasonic field has been found experimentally. The acoustic cavitation is accompanied by the formation of various spatial structures and scale-invariant distribution functions of fluctuations. It has been shown that local fluctuations can have non-Gaussian distribution. A two-dimensional distributed parameter system of stochastic equations describing interacting nonequilibrium phase transitions has been investigated numerically. It has been shown that the system in a wide range of changing initial conditions and the intensity of external noise is characterized by the 1/f behavior of power spectra and scale-invariant distribution functions of fluctuations. The results of numerical simulation agree qualitatively with the experimental data |
K 79 Koverda, V. P. Statistics of low-frequency pulsations in critical regimes of heat mass exchange with phase transitions / V. P. Koverda, V. N. Skokov, A. V. Reshetnikov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 130 -138 Рубрики: ФИЗИКА Кл.слова (ненормированные): FLUCTUATION -- IRREGULAR HIGH-ENERGY -- 1 / F СПЕКТРЫ Аннотация: Experimental investigation of fluctuation dynamics in critical and transitional modes of heat mass exchange shows existence of irregular high-energy pulsations with power spectrum inversely proportional to the frequency—so called 1/f spectrum. Such regimes are characterized by the fact that an essential part of the pulsations energy is connected with very slow processes and mean that large high-energy bursts are possible in the system. Another characteristic feature of such regimes is scale invariance of the fluctuations distribution function. According to the theory, the 1/f fluctuations can emerge in physical systems due to simultaneous phase transitions in presence of sufficiently intensive white noise. This paper is devoted to detailed investigation of relaxation processes at steadying of stationary stochastic process in non-equilibrium phase transitions in system of two nonlinear stochastic differential equation. Such an information reveals statistical patterns of particular large-scale low-frequency bursts. Discontinuous “forgetting” of the initial conditions takes place. It is shown by numerical methods that distributions of duration and maximal values of the low-frequency extreme bursts have the power-like form. Experimental investigation results of statistical characteristics of fluctuation processes at ultrasonic cavitation and flash boiling of overheated water jets are presented. Results of the experiments carried out fit conclusions of the theoretical model for interacting heterogeneous phase transitions |
V 70 Vinogradov, A. V. Spectral Characteristics of Fluctuations in Ultrasonic Cavitation of Water and Glycerin / A. V. Vinogradov // Heat Transfer Research. - 2008. - Vol.39, №6. - С. 519-527 Рубрики: ФИЗИКА Кл.слова (ненормированные): FLUCTUATION -- ACOUSTIC CAVITATION -- GLYCERIN Аннотация: The results of experimental investigation of the dynamics of fluctuations in acoustic cavitation of water and glycerin are presented. Near the radiator surface the structures in interacting vapor-gas bubbles having the form of fractal clusters were formed. Using the method of photometric scanning of transmitted laser radiation, the dynamics of fluctuations was investigated. In the transient regime the range of the power of fluctuations changed inversely proportional to frequency. The distributions of local fluctuations differ from Gaussian ones and reveal the properties of scale invariance. The qualitative behavior of the frequency dependence of the spectral density of fluctuations on change in the power of an ultrasonic radiator was investigated. It is shown that the raise of the high-frequency boundary of the flicker behavior point to the buildup of instability and may serve as a precursor of possible large-scale overshoots |
D 98 Dynamics of transition processes and structure formation in critical heat-mass transfer regimes during liquid boiling and cavitation / A. N. Pavlenko, V. P. Koverda, A. V. Skokov, A. V. Reshetnikov, A. V. Vinogradov, A. S. Surtaev // Journal of Engineering Thermophysics. - 2009. - Vol.18, №1. - С. 20-38 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL PHENOMENA -- FALLING FILMS -- LIQUID CAVITATION Аннотация: The results of experimental studies concerning the development of critical phenomena and structure formation in the process of boiling in falling films and during liquid cavitation are given. In conditions of stepwise and periodic pulsed surges of a thermal load, the parameters of formed metastable regular structures and critical parameters of heat-releasing surface drying are shown to be determined by the dynamics of moving wetting boundaries in the process of system self-organization. In the case of high-intensity heat fluxes, decomposition of a falling film is determined by propagation regimes of self-maintaining boiling fronts with a complex shape of intermediate structures. The study of ultrasonic cavitation of water, glycerin, and vacuum oil shows that structures of interacting gas-vapor bubbles (having the form of fractal clusters) are formed near the emitter surface. Spatial structures are characterized by a low-frequency divergence of the power spectra and a scale-invariant function of the fluctuation distributions. The experimental results are in good qualitative agreement with the numerical simulations performed within the theory of 1/f fluctuations in the case of nonequilibrium phase transitions in a spatially distributed system \\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2009, V.18, N 1. P. 20-38.pdf |
B 16 Baidakov, V. G. Attainable superheating of liquefied gases and their solutions : review [Electronic resource] / V. G. Baidakov // Fizika Nizkikh Temperatur. - 2013. - Vol.39, №8. - P835-862. - Bibliogr. : p. 861-862 (87 ref) Рубрики: ФИЗИКА Кл.слова (ненормированные): CAVITATION -- CRYOGENIC LIQUIDS -- META-STABLE STATE Аннотация: The review is mainly concerned with the kinetics of spontaneous boiling-up of liquefied gases and their solutions. It examines the theories of thermofluctuation and quantum nucleation in metastable liquids. The methods of experimental investigation of nucleation kinetics are given. The experimental data on temperature of attainable superheating of cryogenic liquids and solutions of liquefied gases are presented for a wide range of pressures, including negative ones. The properties of new-phase nuclei near the attainable super-heating boundary are discussed. The kinetics of initiated and heterogeneous nucleation is considered. The experimental data on detection of quantum tunneling of nuclei are given. Experimental data are compared with the theories of thermofluctuation and quantum nucleation |
L 95 Low frequency fluctuations of laser beam intensity run through the system of cavitation water clusters [Electronic resource] / V. N. Skokov, V. P. Koverda, A. V. Vinogradov, A. V. Reshetnikov // Thermophysics and Aeromtchanics. - 2010. - Vol.17, №1. - P99-106. - Bibliogr. : p. 106 (21 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): ACOUSTIC CAVITATION -- LOW-FREQUENCY PULSATIONS -- POWER SPECTRUM Аннотация: Experiments on water cavitation in ultrasonic field have been carried out. Low frequency fluctuations of the intensity of laser beam run through the cavitation area have been studied. Experiments have proved presence of low-frequency random fluctuations with frequency dependence of power spectra S ~ 1/ f , α where the exponent α ranged within 0.8 ≤ α ≤ 1.2. From experimental realizations, large-scale low frequency pulsations characterized by scale invariance, which duration is distributed according to the power law, have been distinguished. The results are explained on the basis of mathematical model for the rise of scale invariant fluctuations with 1/ f α power spectrum in the system of two nonlinear stochastic differential equations describing interaction of heterogeneous phase transitions. Distribution of extreme low frequency emissions obtained from numerical solutions to stochastic equations takes the power series form. Correlations of dynamic scaling between critical indicators determining frequency dependence of pulsations power spectra α and distribution functions of extreme low frequency pulsation amplitudes β have been determined. It is shown that both in the experiments on acoustic cavitation of water and in the theoretical model of interacting phase transitions critical indicators are bound with the correlation α + β = 2. Spectra of fluctuation power are determined in the experiments simpler and more accurately than the function of extreme amplitudes distribution. In case when only one frequency dependence of fluctuation capacity spectra is known correlations between indicators serve to obtain information on the distribution of large scale emissions and to estimate critical amplitudes. \\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2010, V. 17, N 1. P. 99-106.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. Spontaneous cavitation in a Lennard-Jones liquid at negative pressures [Electronic resource] / V. G. Baidakov, K. S. Bobrov // Journal of Chemical Physics. - 2014. - Vol.140, №18. - С. 184506. - Bibliogr. : p. 184506 (65 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): MOLECULAR DYNAMICS -- LENNARD-JONES LIQUID -- NEGATIVE PRESSURES Аннотация: We report a molecular dynamics (MD) study of homogeneous bubble nucleation in a Lennard-Jones liquid under a negative pressure (cavitation). The rate of bubble nucleation has been determined in the range 2×10- 9 \\\\expert2\\nbo\\Journal of Chemical Physics\\2014, v.140, p.184506.pdf |
B 16 Baidakov, V. G. Surface tension of cavitation pockets according to data of computer simulation of nucleation in a stretched fluid [Electronic resource] / V. G. Baidakov // Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2015. - Vol. 77, № 2. - С. 119-124. - Bibliogr. : p. 124 (40 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL CAVITATION POCKETS -- lENNARD-JONES FLUID Аннотация: Surface tension γ and effective radius R of critical cavitation pockets in a stretched Lennard-Jones fluid have been determined from the data on pocket formation work W *. The W * value has been calculated in terms of the stationary homogeneous nucleation theory from the results of molecular dynamics simulation of the parameters of cavitation process in a range of reduced temperatures T* = k B T/ɛ = 0.35–0.8. The calculated data have been approximated by the extended Tolman equation, which, in addition to linear correction (∼δ∞/R), takes into account the quadratic correction (∼l 2/R 2) for curvature to the surface tension of a critical pocket. It has been shown that parameter δ∞ is negative and amounts to a few tenths of an atom diameter, with the value of l being substantially dependent on temperature and reaching the diameter of a Lennard-Jones atom at the upper boundary of the considered temperature range. \\\\expert2\\nbo\\Colloid Journal\\2015, V.77, N2,119.pdf |
B 16 Baidakov, V. G. Acoustic Cavitation in a Highly Superheat Liquid [Text] / V. G. Baidakov, A. M. Kaverin, V. P. Skripov // Soviet Physics Acoustics-USSR. - 1981. - V.27, Is.5. - P387-390 Рубрики: ФИЗИКА Кл.слова (ненормированные): КАВИТАЦИЯ АКУСТИЧЕСКАЯ -- жидкости сильно перегретые |
V 70 Vinogradov, V. E. Explosive cavitation in superheated liquid argon [Text] / V. E. Vinogradov, P. A. Pavlov, V. G. Baidakov // Journal of Chemical Physics. - 2008. - Vol. 128, № 23. - P234508/1-234508/6 Рубрики: ФИЗИКА Кл.слова (ненормированные): ARGON Аннотация: The kinetics of explosive boiling-up of liquid argon has been investigated at negative pressures created by the reflection of a compression pulse 3–5 µs long from the free surface of a liquid by the method of liquid pulse heating on a thin platinum wire (with a rate of temperature increase of about 1 K/µs). The limiting superheats T* (stretches p*), the effective nucleation rate J*, and the derivative GT=(d ln J/dT)T=T* have been determined by experimental data on the thermal perturbation of a wire probe and the results of solution of the problem on the initial stage of explosive boiling-up of a liquid. The experimental data are compared with homogeneous nucleation theory. \\\\Expert2\\nbo\\Journal of Chemical Physics\\2008, v.128, p.234508.pdf |
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 |