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Общее количество найденных документов : 208
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1.

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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2.

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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3.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Pankov A. S.
Заглавие : Nucleation in ethane-nitrogen solutions. I. Homogeneous nucleation [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 86. - С. 930-935
Систем. требования: http://www.sciencedirect.com/science?_ob=ArticleListURL&_method
Примечания : Bibliogr. : p. 935 (32 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): classical nucleation theory --method of lifetime measurement--ethane-nitrogen solution
Аннотация: The method of lifetime measurement is used to investigate the kinetics of spontaneous boiling-up of ethane-nitrogen solutions. Superheating temperatures Tn of solutions have been determined in experiments at pressure p = 1.0, 1.6 MPa and nitrogen concentration in ethane x = 0.5, 1.5 mol% in the nucleation rate range J = 1 × 104-2 × 108 s-1 m-3. At J 3 × 106 s-1 m-3 one can observe a satisfactory agreement between experimental data and homogeneous nucleation theory with respect to the temperature dependence of the nucleation rate and a systematic disagreement in the superheating temperature. At x = 0.5 mol% attainable superheating temperatures achieved by experiment coincide within the experimental error with theoretical values, and at x = 1.5 mol% exceed them by approximately 1.7 K. It is shown that one possible reason of such "excess superheating" of a solution beyond the theoretical value of Tn may be the absence of adsorption equilibrium at the critical bubble-ambient solution interface
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 86, p.930-935.pdf
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4.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Pankov A. S.
Заглавие : Nucleation in ethane–nitrogen solutions. II. Heterogeneous and initiated nucleation [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 86. - С. 936-942
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0017931015003312
Примечания : Bibliogr. : p. 942 (18 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation --method of continuous pressure lowering--heterogeneous nucleation --superheating
Аннотация: The method of continuous pressure decrease has been used to investigate limiting (attainable) stretches of ethane–nitrogen solutions. Experiments were conducted at temperatures of 260, 266, 270, and 276 K and at nitrogen concentrations in the solution of 0.5 and 1.5 mol%. Pressure decrease rates were taken in the range 0.01–0.1 MPa/s. Distribution functions of liquid boiling-up events in dependence on pressure have been obtained allowing one to determine the most probable (attainable) pressures of liquid boiling-up and the nucleation rate. The results are interpreted in terms of nucleation thermodynamics and kinetics in liquids on a solid surface containing inclusions that initiate the boiling-up processes. It is shown that for realizing homogeneous nucleation it is not necessarily required that the wettability is close to the ideal one. The reasons for the discrepancy between experimental data and predictions of homogeneous nucleation theory at nucleation rates J 3 × 106 s−1 m−3 are discussed.
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 86, p.936-942.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 53/S 86
Автор(ы) : Skokov V. N., Koverda V. P., Vinogradov A. V., Reshetnikov A. V.
Заглавие : Stochastic resonance at nonequilibrium phase transitions [Электронный ресурс]
Место публикации : Physica A. - 2015. - Vol. 430, Article number 15968. - С. 65-72
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0378437115002071
Примечания : Bibliogr. : p. 71-72 (27 ref.). - 23.12.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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6.

Вид документа : Статья из журнала
Шифр издания : 53/H 99
Автор(ы) : Reshetnikov A. V., Mazheiko N. A., Skokov V. N., Koverda V. P.
Заглавие : Hydrodynamic response to explosive boiling-up in a jet of superheated water [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 85, June. - С. 965-970
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0017931015002082
Примечания : Bibliogr. : p. 969-970 (35 ref.). - 24.03.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f fluctuations --coanda effect--complete jet breakup
Аннотация: The behavior of the jet recoil of boiling water discharging through a short cylindrical nozzle into the atmosphere and jet shape under high and limit superheating was experimentally studied. There was a complete breakup of the jet under both the realization of intensive heterogeneous nucleation (explosive boiling-up) in the flow and the presence of an adjacent plane behind the nozzle outlet. The complete jet breakup was accompanied by a sharp decrease of the jet recoil (the crisis of the recoil force). An explanation of the observed phenomena was given with the involvement of the Coanda effect. In both the transient regimes of boiling-up and the transition to the complete jet breakup 1/f fluctuations were observed. They pointed to the instability and possibility of large-scale outburst in the flow
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 85, p.965-970.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 53/H 99
Автор(ы) : Reshetnikov A. V., Mazheiko N. A., Skokov V. N., Koverda V. P.
Заглавие : Hydrodynamic response to explosive boiling-up in a jet of superheated water [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 85, June. - С. 965-970
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0017931015002082
Примечания : Bibliogr. : p. 969-970 (35 ref.). - 24.03.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f fluctuations --coanda effect--complete jet breakup
Аннотация: The behavior of the jet recoil of boiling water discharging through a short cylindrical nozzle into the atmosphere and jet shape under high and limit superheating was experimentally studied. There was a complete breakup of the jet under both the realization of intensive heterogeneous nucleation (explosive boiling-up) in the flow and the presence of an adjacent plane behind the nozzle outlet. The complete jet breakup was accompanied by a sharp decrease of the jet recoil (the crisis of the recoil force). An explanation of the observed phenomena was given with the involvement of the Coanda effect. In both the transient regimes of boiling-up and the transition to the complete jet breakup 1/f fluctuations were observed. They pointed to the instability and possibility of large-scale outburst in the flow
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 85, p.965-970.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Pankov A. S.
Заглавие : Nucleation in ethane-nitrogen solutions. I. Homogeneous nucleation [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 86. - С. 930-935
Систем. требования: http://www.sciencedirect.com/science?_ob=ArticleListURL&_method
Примечания : Bibliogr. : p. 935 (32 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): classical nucleation theory --method of lifetime measurement--ethane-nitrogen solution
Аннотация: The method of lifetime measurement is used to investigate the kinetics of spontaneous boiling-up of ethane-nitrogen solutions. Superheating temperatures Tn of solutions have been determined in experiments at pressure p = 1.0, 1.6 MPa and nitrogen concentration in ethane x = 0.5, 1.5 mol% in the nucleation rate range J = 1 × 104-2 × 108 s-1 m-3. At J 3 × 106 s-1 m-3 one can observe a satisfactory agreement between experimental data and homogeneous nucleation theory with respect to the temperature dependence of the nucleation rate and a systematic disagreement in the superheating temperature. At x = 0.5 mol% attainable superheating temperatures achieved by experiment coincide within the experimental error with theoretical values, and at x = 1.5 mol% exceed them by approximately 1.7 K. It is shown that one possible reason of such "excess superheating" of a solution beyond the theoretical value of Tn may be the absence of adsorption equilibrium at the critical bubble-ambient solution interface
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 86, p.930-935.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 53/S 86
Автор(ы) : Skokov V. N., Koverda V. P., Vinogradov A. V., Reshetnikov A. V.
Заглавие : Stochastic resonance at nonequilibrium phase transitions [Электронный ресурс]
Место публикации : Physica A. - 2015. - Vol. 430, Article number 15968. - С. 65-72
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0378437115002071
Примечания : Bibliogr. : p. 71-72 (27 ref.). - 23.12.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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10.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Pankov A. S.
Заглавие : Nucleation in ethane–nitrogen solutions. II. Heterogeneous and initiated nucleation [Электронный ресурс]
Место публикации : International Journal of Heat and Mass Transfer. - 2015. - Vol. 86. - С. 936-942
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0017931015003312
Примечания : Bibliogr. : p. 942 (18 ref.). - 18.11.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation --method of continuous pressure lowering--heterogeneous nucleation --superheating
Аннотация: The method of continuous pressure decrease has been used to investigate limiting (attainable) stretches of ethane–nitrogen solutions. Experiments were conducted at temperatures of 260, 266, 270, and 276 K and at nitrogen concentrations in the solution of 0.5 and 1.5 mol%. Pressure decrease rates were taken in the range 0.01–0.1 MPa/s. Distribution functions of liquid boiling-up events in dependence on pressure have been obtained allowing one to determine the most probable (attainable) pressures of liquid boiling-up and the nucleation rate. The results are interpreted in terms of nucleation thermodynamics and kinetics in liquids on a solid surface containing inclusions that initiate the boiling-up processes. It is shown that for realizing homogeneous nucleation it is not necessarily required that the wettability is close to the ideal one. The reasons for the discrepancy between experimental data and predictions of homogeneous nucleation theory at nucleation rates J 3 × 106 s−1 m−3 are discussed.
\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 86, p.936-942.pdf
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