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1.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : Surface tension of cavitation pockets according to data of computer simulation of nucleation in a stretched fluid [Электронный ресурс]
Место публикации : Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2015. - Vol. 77, № 2. - С. 119-124
Систем. требования: http://link.springer.com/article/10.1134/S1061933X15020027
Примечания : Bibliogr. : p. 124 (40 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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2.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : Surface tension of cavitation pockets according to data of computer simulation of nucleation in a stretched fluid [Электронный ресурс]
Место публикации : Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2015. - Vol. 77, № 2. - С. 119-124
Систем. требования: http://link.springer.com/article/10.1134/S1061933X15020027
Примечания : Bibliogr. : p. 124 (40 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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3.

Вид документа :
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N., Reshetnikov A. V.
Заглавие : Statistics of low-frequency pulsations in critical regimes of heat mass exchange with phase transitions
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 130 -138
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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4.

Вид документа :
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N., Reshetnikov A. V.
Заглавие : Statistics of low-frequency pulsations in critical regimes of heat mass exchange with phase transitions
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 130 -138
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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5.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Bobrov K. S.
Заглавие : Spontaneous cavitation in a Lennard-Jones liquid at negative pressures [Электронный ресурс]
Место публикации : Journal of Chemical Physics. - 2014. - Vol.140, №18. - С. 184506
Систем. требования: http://www.scopus.com/record/display.url?eid=2-s2.0-84904801292&origin=resultslist&sort=plf-f&src=s&st1=Baidakov
Примечания : Bibliogr. : p. 184506 (65 ref.). - 14.08.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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- 9J
\\\\expert2\\nbo\\Journal of Chemical Physics\\2014, v.140, p.184506.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Bobrov K. S.
Заглавие : Spontaneous cavitation in a Lennard-Jones liquid at negative pressures [Электронный ресурс]
Место публикации : Journal of Chemical Physics. - 2014. - Vol.140, №18. - С. 184506
Систем. требования: http://www.scopus.com/record/display.url?eid=2-s2.0-84904801292&origin=resultslist&sort=plf-f&src=s&st1=Baidakov
Примечания : Bibliogr. : p. 184506 (65 ref.). - 14.08.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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- 9J
\\\\expert2\\nbo\\Journal of Chemical Physics\\2014, v.140, p.184506.pdf
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7.

Вид документа :
Шифр издания : 53/V 70
Автор(ы) : Vinogradov A. V.
Заглавие : Spectral Characteristics of Fluctuations in Ultrasonic Cavitation of Water and Glycerin
Место публикации : Heat Transfer Research. - 2008. - Vol.39, №6. - С. 519-527
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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8.

Вид документа :
Шифр издания : 53/V 70
Автор(ы) : Vinogradov A. V.
Заглавие : Spectral Characteristics of Fluctuations in Ultrasonic Cavitation of Water and Glycerin
Место публикации : Heat Transfer Research. - 2008. - Vol.39, №6. - С. 519-527
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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9.

Вид документа : Статья из журнала
Шифр издания : 53/L 95
Автор(ы) : Skokov V. N., Koverda V. P., Vinogradov A. V., Reshetnikov A. V.
Заглавие : Low frequency fluctuations of laser beam intensity run through the system of cavitation water clusters
Место публикации : Thermophysics and Aeromtchanics. - 2010. - Vol.17, №1. - С. 99-106
Примечания : Bibliogr. : p. 106 (21 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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10.

Вид документа : Статья из журнала
Шифр издания : 53/L 95
Автор(ы) : Skokov V. N., Koverda V. P., Vinogradov A. V., Reshetnikov A. V.
Заглавие : Low frequency fluctuations of laser beam intensity run through the system of cavitation water clusters
Место публикации : Thermophysics and Aeromtchanics. - 2010. - Vol.17, №1. - С. 99-106
Примечания : Bibliogr. : p. 106 (21 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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