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Общее количество найденных документов : 46
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1.

Вид документа : Статья из журнала
Шифр издания : 53/Б 18
Автор(ы) : Байдаков В. Г., Каверин А. М., Скрипов В. П.
Заглавие : Кинетика флуктуационного вскипания перегретого жидкого метана
Параллельн. заглавия :Kinetics of the Fluctuation Ebullition of Superheated Liquid Methane
Место публикации : Коллоидный журнал. - 1980. - Т. 42, N 2. - С. 314-317
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): метан перегретый--перегретый метан--вскипание флуктуационное--флуктуационное вскипание--кинетика вскипания--метан жидкий--жидкий метан
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2.

Вид документа : Статья из журнала
Шифр издания : 53/Б 18
Автор(ы) : Байдаков В. Г., Каверин А. М., Скрипов В. П.
Заглавие : Кинетика флуктуационного вскипания перегретого жидкого метана
Параллельн. заглавия :Kinetics of the Fluctuation Ebullition of Superheated Liquid Methane
Место публикации : Коллоидный журнал. - 1980. - Т. 42, N 2. - С. 314-317
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): метан перегретый--перегретый метан--вскипание флуктуационное--флуктуационное вскипание--кинетика вскипания--метан жидкий--жидкий метан
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3.

Вид документа :
Шифр издания : 53/P 34
Автор(ы) : Pavlov P. A.
Заглавие : Thermodynamic crisis of boiling
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 145-154
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): vapor-- loop heat pipe
Аннотация: The procedure of calculation of the dynamics of rapid near-wall vaporization near a metallic heater is considered. A physical model of explosive boiling-up on bubbles of fluctuation origin is used. The model is limited to regimes when the motion of bubbles can be ignored and convective flows do not have enough time to develop. It is assumed that the dry spot under a bubble thermally insulates the heater wall. The heat removal is provided by the vicinity of the wetting line (WL). An analytical calculation has become possible on the basis of the well-known exact solution to the problem of the temperature field near the wetting line. Generalization of this solution has led to two new problems. These are the problem of allowance for the difference of the dynamic wetting angle from the right angle and that of allowance for thermocapillary flows. A numerical comparison of the results of calculation of the dry area with the use of different methods of allowing for the “tightness” effect in the dynamics of bubble generation and growth has been made. The evolution of bubbles from their generation to growth limited by the heat supply has been investigated. It has been found that the transition stage in the development of bubbles from Rayleigh to thermal ones is of considerable importance in the processes of explosive boiling-up. The dynamics of change in the dry area and wetting line length prior to the stage of bubble merging into a vapor film has been calculated. A condition of passage of the heat flux through a maximum is found. The applicability of the idea of thermodynamic crisis to calculations of miniature devices is justified. The problem of constructing a model to calculate the interphase surface shape near the wetting line under a developed thermocapillary flow and considerable reactive forces of the vapor flow is formulated. The model is in good agreement with the results of experiments on pulsed superheating of liquids at a rate higher than 1 K/μs
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4.

Вид документа :
Шифр издания : 53/P 34
Автор(ы) : Pavlov P. A.
Заглавие : Thermodynamic crisis of boiling
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 145-154
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): vapor-- loop heat pipe
Аннотация: The procedure of calculation of the dynamics of rapid near-wall vaporization near a metallic heater is considered. A physical model of explosive boiling-up on bubbles of fluctuation origin is used. The model is limited to regimes when the motion of bubbles can be ignored and convective flows do not have enough time to develop. It is assumed that the dry spot under a bubble thermally insulates the heater wall. The heat removal is provided by the vicinity of the wetting line (WL). An analytical calculation has become possible on the basis of the well-known exact solution to the problem of the temperature field near the wetting line. Generalization of this solution has led to two new problems. These are the problem of allowance for the difference of the dynamic wetting angle from the right angle and that of allowance for thermocapillary flows. A numerical comparison of the results of calculation of the dry area with the use of different methods of allowing for the “tightness” effect in the dynamics of bubble generation and growth has been made. The evolution of bubbles from their generation to growth limited by the heat supply has been investigated. It has been found that the transition stage in the development of bubbles from Rayleigh to thermal ones is of considerable importance in the processes of explosive boiling-up. The dynamics of change in the dry area and wetting line length prior to the stage of bubble merging into a vapor film has been calculated. A condition of passage of the heat flux through a maximum is found. The applicability of the idea of thermodynamic crisis to calculations of miniature devices is justified. The problem of constructing a model to calculate the interphase surface shape near the wetting line under a developed thermocapillary flow and considerable reactive forces of the vapor flow is formulated. The model is in good agreement with the results of experiments on pulsed superheating of liquids at a rate higher than 1 K/μs
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5.

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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6.

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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7.

Вид документа :
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N.
Заглавие : Statistics of fluctuations with a 1/f spectrum at phase transitions in a spatially distributed system
Место публикации : Physica A. - 2011. - Vol. 390, № 13. - С. 2468-2479
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f-noise--first passage time--avalanches
Аннотация: A study has been made on the statistics of fluctuations in a spatially distributed system, which describes the interaction of nonequilibrium phase transitions. It is shown that at a certain intensity of external white noise acting on phase transitions, the time and spatial spectra of fluctuations have power laws S(f)∼f−α and S(k)∼k−γ. The dependence of the exponents α and γ on the value of the diffusion coefficient determining the spatial interaction of fluctuations have been found. Extreme low-frequency fluctuations has been revealed and distribution functions of their duration P(τ)∼τ−β and size P(s)∼s−ν have been determined. It has been found that the exponent α of the frequency dependence of time spectra and the exponent β of the distribution function of the fluctuation duration are related by the relation α+β=2. The exponent of the spatial spectrum γ and the exponent of the size distribution function ν are related by a similar relation: γ+ν=2. The results of experimental studies on fluctuations in a typical nonequilibrium phase transition such as transient modes of water boiling on a wire heater are presented. It was demonstrated that the critical exponents, which describe the power dependence of power spectra of fluctuations and the amplitude distribution of extreme surges, are related by the relation α+β=2 both in experiments and in the theoretical model of interacting heterogeneous phase transitions
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8.

Вид документа :
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N.
Заглавие : Statistics of fluctuations with a 1/f spectrum at phase transitions in a spatially distributed system
Место публикации : Physica A. - 2011. - Vol. 390, № 13. - С. 2468-2479
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f-noise--first passage time--avalanches
Аннотация: A study has been made on the statistics of fluctuations in a spatially distributed system, which describes the interaction of nonequilibrium phase transitions. It is shown that at a certain intensity of external white noise acting on phase transitions, the time and spatial spectra of fluctuations have power laws S(f)∼f−α and S(k)∼k−γ. The dependence of the exponents α and γ on the value of the diffusion coefficient determining the spatial interaction of fluctuations have been found. Extreme low-frequency fluctuations has been revealed and distribution functions of their duration P(τ)∼τ−β and size P(s)∼s−ν have been determined. It has been found that the exponent α of the frequency dependence of time spectra and the exponent β of the distribution function of the fluctuation duration are related by the relation α+β=2. The exponent of the spatial spectrum γ and the exponent of the size distribution function ν are related by a similar relation: γ+ν=2. The results of experimental studies on fluctuations in a typical nonequilibrium phase transition such as transient modes of water boiling on a wire heater are presented. It was demonstrated that the critical exponents, which describe the power dependence of power spectra of fluctuations and the amplitude distribution of extreme surges, are related by the relation α+β=2 both in experiments and in the theoretical model of interacting heterogeneous phase transitions
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9.

Вид документа : Статья из журнала
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N.
Заглавие : Statistics of fluctuations for nonequilibrium phase transitions in spatially distributed system with a 1/f spectrum
Место публикации : Doklady Physics. - 2009. - Vol.54, №10. - С. 454-458
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f spectrum --fluctuations --non-equilibrium phase
Аннотация: The statistics of fluctuations for non-equilibrium phase transitions in spatially distributed system with a 1/f Spectrum has been reported. The systems in which it is possible to observe the 1/f noise belong to various fields of investigations the physics of solids and electronics, astrophysics, geophysics, biology, economy, and social sciences. The stationary stochastic processes with the 1/f spectrum are characterized by flashes and avalanche dynamics. The fluctuation power spectra more often are not measured directly in the self organized criticality models but calculated from the found avalanche distributions. The fluctuation spectra for the spatially distributed system and for other values of diffusivity have the power dependence. The initial conditions for each spatial point of these two systems were chosen with opposite signs corresponding to the different potential valleys.
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10.

Вид документа : Статья из журнала
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N.
Заглавие : Statistics of fluctuations for nonequilibrium phase transitions in spatially distributed system with a 1/f spectrum
Место публикации : Doklady Physics. - 2009. - Vol.54, №10. - С. 454-458
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f spectrum --fluctuations --non-equilibrium phase
Аннотация: The statistics of fluctuations for non-equilibrium phase transitions in spatially distributed system with a 1/f Spectrum has been reported. The systems in which it is possible to observe the 1/f noise belong to various fields of investigations the physics of solids and electronics, astrophysics, geophysics, biology, economy, and social sciences. The stationary stochastic processes with the 1/f spectrum are characterized by flashes and avalanche dynamics. The fluctuation power spectra more often are not measured directly in the self organized criticality models but calculated from the found avalanche distributions. The fluctuation spectra for the spatially distributed system and for other values of diffusivity have the power dependence. The initial conditions for each spatial point of these two systems were chosen with opposite signs corresponding to the different potential valleys.
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