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1-20 21-40 41-46

Инвентарный номер: нет.

   T 82


    Transient behavior of superheated water jets boiling [Электронный ресурс] / A. V. Reshetnikov, K. A. Busov, N. A. Mazheiko, V. N. Skokov, V. P. Koverda // Thermophysics and Aeromtchanics. - 2012. - Vol.19, №2. - P329-336

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
1/f FLUCTUATIONS -- JET FORMS -- NUCLEATION FREQUENCY
Аннотация: Superheated water flowing out from high-pressure chamber through short cylindrical and slot channel has been studied experimentally. Relation of vaporization mechanisms in superheated liquid (boiling in single, not interacting centers, intense heterogeneous vaporization, and homogeneous fluctuating nucleation) and respective forms of superheated water jets has been determined. Temperature intervals with transient behavior of boiling have been determined. It is shown that at transient behavior of boiling the amplitude of pulsations of jet parameters increases, and in the spectra of pulsation power, the low-frequency component 1/f appears

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   S 86


    Stochastic resonance at nonequilibrium phase transitions [Electronic resource] / V. N. Skokov, V. P. Koverda, A. V. Vinogradov, A. V. Reshetnikov // Physica A. - 2015. - Vol. 430, Article number 15968. - С. 65-72. - Bibliogr. : p. 71-72 (27 ref.)

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
1/f-NOISE -- NONEQUILIBRIUM PHASE TRANSITIONS -- BOILING CRISIS
Аннотация: Abstract Thermal pulsations in a transition from a nucleate to a film regime of water boiling on a wire heater with a periodic Joule heat release have been studied experimentally. At frequencies of the periodic action smaller than 0.1 Hz the intermittency of the nucleate and film boiling regimes was observed. In this case the amplitude of thermal pulsations increased. The experiments with an additional noise source were carried out. With an increase in the intensity of the noise the power of the output periodic mode increased and reaching the maximum began to decrease. The results are interpreted as stochastic resonance when the periodic component of pulsations increases in the presence of noise. The results show that in a complex system with nonequilibrium phase transitions there can occur both the extreme fluctuations with 1/f power spectrum and stochastic resonance under external periodic action.

\\\\expert2\\nbo\\Physica A\\2015, v. 430, p.65-72.pdf
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   S 66

    Skokov, V. N.
    Self-organization of a critical state and 1/f(alpha)-fluctuations at film boiling [] / V. N. Skokov, V. P. Koverda, A. V. Reshetnikov // Physics Letters A. - 1999. - V. 263, N 4-6. - С. 430-433

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
NONEQUILIBRIUM PHASE TRANSITIONS -- 1/f-NOISE
Аннотация: 1/f and 1/f(2)-fluctuations have been first revealed by experiment at film boiling on a vertically oriented platinum heater. Fluctuations of 1/f(alpha)-spectrum have been observed over both a wide range of governing parameters and a band of five decimal orders. The experimental results testify to a possible self-organized critical behaviors of a dynamical system at nonequilibrium phase transitions

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Инвентарный номер: нет.

   S 66

    Skokov, V. N.
    Fluctuations with a 1/f(alpha) spectrum in film boiling [] / V. N. Skokov, V. P. Koverda, A. V. Reshetnikov // Jetp Letters. - 1999. - V. 69, N 8. - С. 636-639

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
NONEQUILIBRIUM PHASE TRANSITIONS -- 1/f-NOISE
Аннотация: 1/f and 1/f(2) noise were observed experimentally in film boiling of water on vertically oriented platinum heater. Fluctuations with a 1/f(alpha) spectrum were observed in a wide range of controlling parameters and seen over five orders of magnitude in frequency. It was noted that the process investigated is similar to the phenomenon of self-organized criticality

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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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10.

11.

Инвентарный номер: нет.

   R 45

    Reshetnikov, A. V.
    Relaxation and power spectra of low-frequency fluctuations in foams [Электронный ресурс] / A. V. Reshetnikov, V. N. Skokov, V. P. Koverda // Journal of Applied Mechanics and Technical Physics. - 2012. - Vol.53, №6. - P834-838

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
FOAM FORMATION -- LOW-FREQUENCY FLUCTUATIONS -- POWER SPECTRUM
Аннотация: The dynamics of foam formation in a water-glycerin solution was studied to establish the relationship between the relaxation characteristics and the fluctuation power spectrum for a stochastic process. Foaming occurred during the dissociation of the gas-saturated solution and during bubbling of the solution through a porous filter. Two types of relaxation of the foam-exponential and power-law-were revealed. The power-law type of relaxation was observed upon exposure to ultrasound. Relationships between the type of relaxation and the distribution of lowfrequency fluctuations and power spectra was established

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12.

13.

Инвентарный номер: нет.

   R 30


    Reaktive Recoil and Pressure Pulsations with 1/f Power Spectrum under Conditions of Explosion Boiling of Jets of Superheated Liquid [] / A. V. Reshetnikov, N. A. Mazheiko, V. P. Skripov, V. N. Skokov, V. P. Koverda // High Temperature. - 2002. - V. 40, N 5. - 701-705: graph. - Bibliogr.: p. 760 (14 n.) . - ISSN 0040-3644

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
THERMOPHYSICS -- REACTIVE RECOIL -- PRESSURE PULSATIONS -- 1/f POWER SPECTRUM -- SUPERHEATED LIQUIDS

\\\\Expert2\\NBO\\High Temperature\\2002, v.40, p.701.pdf
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14.

15.

Инвентарный номер: нет.

   P 36


    Peculiarities of superheated liquid discharging under strong and weak nonequilibrium conditions / A. N. Pavlenko, V. P. Koverda, A. V. Reshetnikov, N. A. Mazheiko, A. S. Surtaev, V. E. Zhukov // Journal of Engineering Thermophysics. - 2010. - Vol.19, №4. - С. 289-305

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SUPERHEATED LIQUIDS -- NONEQUILIBRIUM CONDITIONS -- HIGH-PRESSURE CHAMBER
Аннотация: Results obtained in experimental investigating the characteristics of superheated liquid jet discharging under different nonequilibrium conditions are presented. The cases of liquid discharge from a high-pressure chamber and under gravitational jet formation conditions are considered. Different mechanisms of liquid flash boiling with heating growing up to limit superheating are identified in the case of liquid discharging from the high-pressure chamber. Dependences of the reactive force and the jet shape on the value of liquid overheating in a flow are presented. It is shown that the rapidly decreasing value of the reactive force of the jet is connected with its complete disintegration caused by homogeneous nucleation and by the presence of a normal wall behind the outlet from the channel. The parameters of two-phase jet stability in the conditions of gravitational falling, the flow rates, and the size of droplet dispersion zones depend substantially on the shape of holes and the heat flux density. Pronounced effects of partial or full blocking of the holes as a result of soluble impurities deposition in the regimes of cryogenic liquid evaporation or boiling when vapor cavities are formed in the channel are observed in the conditions of long-term discharging under nonadiabatic conditions. This leads to complete disintegration of the jet and uncontrollable reduction of the flow rate through the hole up to full blocking of the latter

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16.

17.

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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18.

19.

Инвентарный номер: нет.

   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.)

ББК 53
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
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20.

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