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1.
Инвентарный номер: нет.
   
   О-42

   
    1/f-Noisa under Conditions of Interaction between Phase Transitions [] / V. N. Skokov, A. V. Reshetnikov, V. P. Koverda, A. V. Vinogradov // High Temperature. - 2001. - Vol. 39, N 2. - С. 296-301: il. - Bibliogr.: p. 321 (13 n.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
1/f-NOISE -- PHASE TRANSITIONS

\\\\Expert2\\NBO\\High Temperature\\2001, v.39, p.316.pdf
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2.
Инвентарный номер: нет.
   
   F 68

   
    Flicker-Noise in Superheated Liquid Jets / A. V. Reshetnikov, V. P. Skripov, V. P. Koverda, N. A. Mazheiko, A. V. Vinogradov // Heat Transfer Research. - 2004. - Vol. 35, № 1-2. - С. 59-66
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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3.
Инвентарный номер: нет.
   

   
    1/f noise and self-organized criticality in crisis regimes of heat and mass transfer / V. N. Skokov, V. P. Koverda, A. V. Reshetnikov, V. P. Skripov, N. A. Mazheiko, A. V. Vinogradov // International Journal of Heat and Mass Transfer. - 2003. - Vol. 46, № 10. - С. 1879-1883
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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4.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Glass transition and crystallization of low-temperature amorphous condensates of the water-propane mixture / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // Doklady Physical Chemistry. - 2012. - Vol.442. - С. 16-18
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOW TEMPERATURES -- GLASS -- WATER-PROPANE

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5.
Инвентарный номер: нет.
   
   S 45

   
    Self-organized criticality and 1/f-noise at interacting nonequilibrium phase transitions / V. N. Skokov, A. V. Reshetnikov, V. P. Koverda, V. P. Koverda, A. V. Vinogradov // Physica A. - 2001. - Vol.293, № 1-2. - С. 1-12
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SELF-ORGANIZED CRITICALITY -- 1/f FLUCTUATIONS -- POWER SPECTRA
Аннотация: Oscillatory combustion regimes were experimentally investigated under the conditions of ignitable liquid boiling-up before the reaction front. Fluctuations with a power spectral density inversely proportional to frequency (1/f-noise) were observed and the power-law character of distribution functions was found. The phenomena are connected with the intersection and interaction of nonequilibrium phase transitions. A mathematical model describing the initiation of 1/f fluctuations at the interaction of a subcritical phase transition and supercritical one in a space-distributed system was suggested

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6.
Инвентарный номер: нет.
   

   
    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
ББК 53
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

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7.
Инвентарный номер: нет.
   
   B 73

   
    Boiling up of jets of superheated ethanol-water solutions / A. V. Reshetnikov, A. V. Vinogradov, V. N. Begletsov, V. N. Skokov, V. P. Koverda // Journal of Engineering Thermophysics. - 2007. - Vol.16, №4. - С. 244-248
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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8.
Инвентарный номер: нет.
   
   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
ББК 53
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

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9.
Инвентарный номер: нет.
   
   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
ББК 53
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
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10.
Инвентарный номер: нет.
   
   L 95

   
    Low-frequency fluctuations with 1/f α power spectrum in transient modes of water boiling on a wire heater [Electronic resource] / V. N. Skokov, V. P. Koverda, A. V. Vinogradov, A. V. Reshetnikov // High Temperature. - 2010. - Vol.48, №5. - P706-712
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL EXPONENT -- DYNAMIC SCALING -- POWER LAW
Аннотация: The investigation of transient modes of water boiling on a wire heater reveals the presence of random vibrations with the frequency dependence of power spectra of S ∼ f -α, where the exponent α has values in the range 0.8 ≤ α < 2. Large-scale low-frequency fluctuations exhibiting the property of scale invariance, the duration of which is distributed by the power law P ∼ τ-β, are present in experimental realizations of random processes describing thermal fluctuations. The properties of such fluctuation processes are described using two nonlinear stochastic differential equations which describe the interaction between different phase transitions. Relations of dynamic scaling are determined between the critical exponents which define the frequency dependence of the power spectra of fluctuations α and of the distribution function of the amplitudes of extreme low-frequency fluctuations β. It is demonstrated that the critical exponents are related by the relation α + β = 2 both in the experiments and in the theoretical model of interacting phase transitions. The power spectra of fluctuations are determined in the experiments with greater simplicity and accuracy than the distribution function of extreme amplitudes. In the cases where only the spectral dependence of power spectra of fluctuations is known, the correlations between the exponents enable one to obtain information about the distribution of large-scale surges and estimate dangerous amplitudes

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