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1-20 21-40 41-46

Вид документа :
Шифр издания : 53
Автор(ы) : Skokov V. N., Koverda V. P., Reshetnikov A. V., Vinogradov A. V.
Заглавие : 1/f Fluctuations under acoustic cavitation of liquids
Место публикации : Physica A. - 2006. - Vol.364. - С. 63-69
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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Вид документа : Статья из журнала
Шифр издания : 53
Автор(ы) : Skokov V. N., Koverda V. P., Reshetnikov A. V., Skripov V. P., Mazheiko N. A., Vinogradov A. V.
Заглавие : 1/f noise and self-organized criticality in crisis regimes of heat and mass transfer
Место публикации : International Journal of Heat and Mass Transfer. - 2003. - Vol. 46, № 10. - С. 1879-1883
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f-noise--fluctuations --flicker noise
Аннотация: Thermal fluctuations under the transition from nucleate to film boiling of water on a wire heater and fluctuations of jet form during an outflow of superheated liquid from a pressure vessel were experimentally investigated. It has been found that power spectrum of the fluctuations has got a low frequency component corresponding to a 1/f law (flicker noise).??The effect given is connected with the occurrence of nonequilibrium phase transitions in the systems: a crisis of heat transfer under the transition from nucleate to film boiling and a crisis of a flow in boiling-up of superheated liquid jet??
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Вид документа : Статья из журнала
Шифр издания : 53/О-42
Автор(ы) : Skokov V. N., Reshetnikov A. V., Koverda V. P., Vinogradov A. V.
Заглавие : 1/f-Noisa under Conditions of Interaction between Phase Transitions
Место публикации : High Temperature. - 2001. - Vol. 39, N 2. - С. 296-301: il.
Примечания : Bibliogr.: p. 321 (13 n.)
ББК : 53
Предметные рубрики: ФИЗИКА
\\\\Expert2\\NBO\\High Temperature\\2001, v.39, p.316.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/A 71
Автор(ы) : Reshetnikov A. V., Sannikov V. N., Skokov V. N., Koverda V. P.
Заглавие : Arc current fluctuation power spectra in the system of a solid metal electrode and carbonate melt
Место публикации : Journal of Applied Mechanics and Technical Physics. - 2007. - Vol. 48, № 1. - С. 7-10
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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Вид документа :
Шифр издания : 53/B 73
Автор(ы) : Reshetnikov A. V., Vinogradov A. V., Begletsov V. N. , Skokov V. N., Koverda V. P.
Заглавие : Boiling up of jets of superheated ethanol-water solutions
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №4. - С. 244-248
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): evolution of the shapes --superheated aqueous solutions --low-boiling liquid
Аннотация: The stability and evolution of the shapes of jets of strongly superheated aqueous solutions of ethanol flowing out of a high-pressure chamber are experimentally investigated at various initial parameters. It has been found that a low-boiling liquid causes shifting to lower temperatures of the boundaries between various kinds of boiling-up jets, such as cylindrical, conical, and open. Large-scale pulsations of the jet shapes are observed in the temperature range from 454 to 484 K, where the jet completely breaks down. The conditions for the formation of large-scale low-frequency pulsations with a power spectrum diverging inversely proportional to the frequency f (1/f spectra) have been revealed. Such fluctuations prove that the flow is unstable and large-scale low-frequency ejections are possible
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10.

11.

Вид документа : Статья из журнала
Шифр издания : 53/D 63
Автор(ы) : Pavlenko A. N., Koverda V. P., Reshetnikov A. V., Surtaev A. S., Tsoi A. N., Mazheiko N. A., Busov K. A., Skokov V. N.
Заглавие : Disintegration of flows of superheated liquid films and jets
Место публикации : Journal of Engineering Thermophysics
Примечания : Bibliogr. : p. 192-193 (65 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): cylindrical channel--experimental investigations--boiling incipience
Аннотация: This paper represents results on investigating the dynamics of boiling and disintegration of superheated liquid films and jets. The first part deals with experimental study of boiling liquid outflow through short cylindrical and slit channels. Evolution of disintegration of a hot water jet flow is observed both at low and moderate superheating and at high and limit superheating, and also for vaporization mechanisms corresponding to these superheatings. Peculiarities of disintegration of jets through slit and cylindrical channels are noticed. Results on measuring the reactive thrust of the jet through a slit channel under different geometrical conditions behind the channel outlet are represented. The 1/f fluctuations in transient regimes of superheated liquid boiling and in transient regimes of behavior of the jet shape are found. The second part of this article represents results on experimental investigation of nonsteady heat transfer and dynamics of the development of crisis phenomena at boiling of a falling subcooled liquid film in the conditions of stepwise heat release. The experimental data were obtained using synchronized high-speed infrared thermography and video. It is shown that with growth and condensation of vapor bubbles, on the liquid film interface appear large-amplitude waves that lead to considerably increasing local intensity of heat transfer. New data on the boiling incipience temperature in a subcooled liquid film, depending on the heat flux density, are obtained. It is found that the development of boiling crisis is a result of appearance of local dry patches and their subsequent growth by the mechanism of longitudinal thermal conductivity in the heat transfer wall as the equilibrium heat flux density is exceeded
\\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2013, V.22, N 3. P. 174-193.pdf
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12.

13.

Вид документа : Статья из журнала
Шифр издания : 53/D 63
Автор(ы) : Pavlenko A. N., Surtaev A. S., Tsoi A. N., Koverda V. P., Reshetnikov A. V., Mazheiko N. A., Busov K. A., Skokov V. N.
Заглавие : Disintegration of flows of superheated liquid films and jets [Электронный ресурс]
Место публикации : Journal of Engineering Thermophysics. - 2013. - Vol.22, №3. - С. 174-193
Систем. требования: http://download.springer.com/static/pdf/185/art%253A10.1134%252FS1810232813030028.pdf?auth66=1405766152_ab2f4265a80d9fb3376059ab9464289b&ext=.pdf
Примечания : Библиогр.: с. 190-193 (65 ref.). - 17.07.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superheated liquid films --liquid boiling --jet shape
Аннотация: This paper represents results on investigating the dynamics of boiling and disintegration of superheated liquid films and jets. The first part deals with experimental study of boiling liquid outflow through short cylindrical and slit channels. Evolution of disintegration of a hot water jet flow is observed both at low and moderate superheating and at high and limit superheating, and also for vaporization mechanisms corresponding to these superheatings. Peculiarities of disintegration of jets through slit and cylindrical channels are noticed. Results on measuring the reactive thrust of the jet through a slit channel under different geometrical conditions behind the channel outlet are represented. The 1/f fluctuations in transient regimes of superheated liquid boiling and in transient regimes of behavior of the jet shape are found. The second part of this article represents results on experimental investigation of nonsteady heat transfer and dynamics of the development of crisis phenomena at boiling of a falling subcooled liquid film in the conditions of stepwise heat release. The experimental data were obtained using synchronized high-speed infrared thermography and video. It is shown that with growth and condensation of vapor bubbles, on the liquid film interface appear large-amplitude waves that lead to considerably increasing local intensity of heat transfer. New data on the boiling incipience temperature in a subcooled liquid film, depending on the heat flux density, are obtained. It is found that the development of boiling crisis is a result of appearance of local dry patches and their subsequent growth by the mechanism of longitudinal thermal conductivity in the heat transfer wall as the equilibrium heat flux density is exceeded.
\\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2013, V.22, N 3. P. 174-193.pdf
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14.

15.

Вид документа :
Шифр издания : 53/D 98
Автор(ы) : Pavlenko A. N., Koverda V. P., Skokov A. V., Reshetnikov A. V., Vinogradov A. V., Surtaev A. S.
Заглавие : Dynamics of transition processes and structure formation in critical heat-mass transfer regimes during liquid boiling and cavitation
Место публикации : Journal of Engineering Thermophysics. - 2009. - Vol.18, №1. - С. 20-38
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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
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16.

17.

Вид документа :
Шифр издания : 53/F 17
Автор(ы) : Faizullin M. Z., Reshetnikov A. V., Koverda V. P.
Заглавие : Synthesis of methane hydrate at low-temperature condensation of molecular beams
Место публикации : Doklady Physics. - 2010. - Vol.55, №8. - С. 388-390
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): amorphous solid water--ice
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18.

19.

Вид документа : Статья из журнала
Шифр издания : 53/F 68
Автор(ы) : Reshetnikov A. V., Skripov V. P., Koverda V. P., Mazheiko N. A., Vinogradov A. V.
Заглавие : Flicker-Noise in Superheated Liquid Jets
Место публикации : Heat Transfer Research. - 2004. - Vol. 35, № 1-2. - С. 59-66
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling-up liquid --critical modes --vapor formation
Аннотация: Change of the shape of a boiling-up liquid jet flowing from a high-pressure vessel at high superheatings was investigated experimentally. Mechanisms of volumetric heterogeneous and homogeneous nucleation are distinguished and their connection with critical modes of outflow is determined. Results of the experimental study of recoil of boiling-up liquid jets in a thermodynamically strong nonequilibrium mode of outflow are presented. The dynamics of vapor content fluctuations is studied by a method of photometry of passed laser radiation. Fluctuations of pressure in a superheated liquid jet at various mechanisms of vapor formation are measured by a method of strain metering. It was found that in intense volumetric boiling-up of a superheated liquid jet the power spectrum of fluctuations has a low-frequency component (flicker-noise) which diverges according to the 1/f law. This effect is related to nonequilibrium phase transitions in the system
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20.

1-20 21-40 41-46

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