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Общее количество найденных документов : 54
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1.
Инвентарный номер: нет.
   
   D 63

   
    Disintegration of flows of superheated liquid films and jets [Electronic resource] / A. N. Pavlenko, V. P. Koverda, A. V. Reshetnikov, A. S. Surtaev, A. N. Tsoi, N. A. Mazheiko, K. A. Busov, V. N. Skokov // Journal of Engineering Thermophysics. - Bibliogr. : p. 192-193 (65 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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.
Инвентарный номер: нет.
   
   D 63

   
    Disintegration of flows of superheated liquid films and jets [Electronic resource] / A. N. Pavlenko, V. P. Koverda, A. V. Reshetnikov, A. S. Surtaev, A. N. Tsoi, N. A. Mazheiko, K. A. Busov, V. N. Skokov // Journal of Engineering Thermophysics. - Bibliogr. : p. 192-193 (65 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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.
Инвентарный номер: нет.
   
   D 63

   
    Disintegration of flows of superheated liquid films and jets [Электронный ресурс] / A. N. Pavlenko, A. S. Surtaev, A. N. Tsoi, V. P. Koverda, A. V. Reshetnikov, N. A. Mazheiko, K. A. Busov, V. N. Skokov // Journal of Engineering Thermophysics. - 2013. - Vol.22, №3. - С. 174-193. - Библиогр.: с. 190-193 (65 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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4.
Инвентарный номер: нет.
   
   D 63

   
    Disintegration of flows of superheated liquid films and jets [Электронный ресурс] / A. N. Pavlenko, A. S. Surtaev, A. N. Tsoi, V. P. Koverda, A. V. Reshetnikov, N. A. Mazheiko, K. A. Busov, V. N. Skokov // Journal of Engineering Thermophysics. - 2013. - Vol.22, №3. - С. 174-193. - Библиогр.: с. 190-193 (65 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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5.
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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6.
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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7.
Инвентарный номер: нет.
   
   P 80

   
    Polymer material laser destruction threshold studies [Текст] / V. P. Efremov, V. E. Privalov, P. V. Skripov, P. V. Charty, V. G. Shemanin // Proceedings of SPIE-The International Society for Optical Engineering. - 2005. - Vol. 5447: Lasers for Measurements and Information Transfer 2004. - С. 234-241
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
POLYMER MATERIALS
Аннотация: The polymer films are widely used in any industry as the construction materials with some specific properties. It demands the detail studies of the laser destruction threshold parameters of such a materials irradiated by the he power laser radiation pulse with energy density in range from 0 up to 200 J/cm2. The probability of the target laser ablation destruction versus the incident laser radiation energy density dependencies for any polymers -- the high pressure polyethylene, epoxy compound, polymethylmetacrylate, styrosil and rubber for comparing -- have been a subject of the experimental studies. The plots of the breakdown probability and plasma emission intensity for all of the samples versus energy density dependences have been got and the breakdown energy density for these targets have been determined by this probability is equal to 0,5 or zero plasma intensity condition. These results show that about 11% of absorbed laser pulse energy was transferred to the target as the shock wave spreading in it when the target thickness is greater than the distance which this shock wave spreads in the time of laser pulse action. ??

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8.
Инвентарный номер: нет.
   
   P 80

   
    Polymer material laser destruction threshold studies [Текст] / V. P. Efremov, V. E. Privalov, P. V. Skripov, P. V. Charty, V. G. Shemanin // Proceedings of SPIE-The International Society for Optical Engineering. - 2005. - Vol. 5447: Lasers for Measurements and Information Transfer 2004. - С. 234-241
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
POLYMER MATERIALS
Аннотация: The polymer films are widely used in any industry as the construction materials with some specific properties. It demands the detail studies of the laser destruction threshold parameters of such a materials irradiated by the he power laser radiation pulse with energy density in range from 0 up to 200 J/cm2. The probability of the target laser ablation destruction versus the incident laser radiation energy density dependencies for any polymers -- the high pressure polyethylene, epoxy compound, polymethylmetacrylate, styrosil and rubber for comparing -- have been a subject of the experimental studies. The plots of the breakdown probability and plasma emission intensity for all of the samples versus energy density dependences have been got and the breakdown energy density for these targets have been determined by this probability is equal to 0,5 or zero plasma intensity condition. These results show that about 11% of absorbed laser pulse energy was transferred to the target as the shock wave spreading in it when the target thickness is greater than the distance which this shock wave spreads in the time of laser pulse action. ??

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9.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    1/f - Noise at non-equilibrium phase transitions / V. P. Koverda, V. N. Skokov, A. V. Reshetnikov // Nucleation Theory and Applications. - Dubna : JINR, 2002. - С. 259-272. - Bibliogr. : p.271-272 (17 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
FLICKER NOISE -- FLUCTUATION -- FILMS

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10.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    1/f - Noise at non-equilibrium phase transitions / V. P. Koverda, V. N. Skokov, A. V. Reshetnikov // Nucleation Theory and Applications. - Dubna : JINR, 2002. - С. 259-272. - Bibliogr. : p.271-272 (17 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
FLICKER NOISE -- FLUCTUATION -- FILMS

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