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1-20 21-28

Вид документа : Статья из сборника (однотомник)
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Boltachev G. Sh.
Заглавие : Nucleation at retrograde condensation [Электронный ресурс]
Место публикации : AIP Conference Proceedinds "Nucleation and atmospheric aerosols 2000" : 15th International Conference. - Rolla, Missouri (USA), 2000. - Vol. 534. - С. 295
Систем. требования: http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.1361897
Примечания : 25.08.2015
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleations--condensation--surface tension
Аннотация: A binary Van-der-Waals solution is considered. Within the framework of the Gibbs and Van-der-Waals capillary theories under the conditions of constancy of the temperature and the composition the size dependences of surface tension are calculated for critical nuclei of liquid and vapor. The phenomenon of “closure” of size dependences and the presence anomalously of high maximums on them are established.
\\\\expert2\\nbo\\AIP Conf. Proceedings, 2000\\2000. V. 534. P. 295.pdf
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Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Boltachev G. Sh.
Заглавие : Nucleation at retrograde condensation
Место публикации : AIP Conference Proceedings. - 2000. - Vol. 534, Is. 1. - С. 295-298: graph. - ISSN 0094-243X. - ISSN 0094-243X
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation--condensation--surface tension--retrograde condensation
Аннотация: A binary Van-der-Waals solution is considered. Within the framework of the Gibbs and Van-der-Waals capillary theories under the conditions of constancy of the temperature and the composition the sise dependences of surface tension s(R) are calculated for critical nuclei of liquid and vapor. The phenomenon of "closure" of size dependences s(R) and the presence anomalously of high maximums on them are established
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Вид документа : Статья из журнала
Шифр издания : 53/B 27
Автор(ы) : Bartuli E., Vershinin S. V., Maydanik Yu. F.
Заглавие : Visual and instrumental investigations of a copper-water loop heat pipe
Место публикации : International Journal of Heat and Mass Transfer. - 2013. - Vol.61, №1. - С. 35-40
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): condensation--copper-water loop heat pipe--flat gap condenser
Аннотация: Visual and instrumental investigations of the processes of condensation and redistribution of a working fluid in a loop heat pipe have been carried out. This paper presents the results of an experimental investigation of the heat transfer and hydrodynamics during the condensation of water vapor in a flat gap condenser measuring 80 × 40 × 1 mm. Investigations have been conducted at a condenser cooling temperature of 20, 40 and 60 °. During all operating modes a stratified two-phase flow and film condensation have been observed. The temperature field in the condenser has been measured, and the heat-transfer coefficients and the thermal resistances have been determined
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Вид документа :
Шифр издания : 53/C 51
Автор(ы) : Chernysheva M. A., Vershinin S. V., Maydanik Yu. F.
Заглавие : Heat transfer during condensation of moving steam in a narrow channel
Место публикации : International Journal of Heat and Mass Transfer. - 2009. - Vol.52, №11-12. - С. 2437-2443
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): intube condensation--two-phase flow--loop heat pipe
Аннотация: The paper presents the results of experimental investigation of heat transfer and hydrodynamics during condensation of moving steam in a narrow channel of square cross-section 2 mm × 2 mm. The channel had a serpentine shape, the channel length was 660 mm. An experimental cell simulated conditions of heat transfer in the condenser of loop heat pipes. The steam velocity at the channel inlet ranged from 13 to 52 m/s, the pressure was 1 atm. The temperature of the cooling water varied from 70 to 95 °C. The annular flow pattern was noted in the whole range of the regime parameters. There was a clear boundary between the condensation zone and the zone occupied by the condensed phase downstream. Temperature has measured along the channel, and the heat-transfer coefficients have been determined. The coefficient values varied from 10,000 to 55,000 W/K m2 depending on the steam velocity at the channel inlet and the cooling temperature. The efficiency of the condenser – heat exchanger has been investigated
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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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10.

11.

Вид документа : Статья из журнала
Шифр издания : 53/D 63
Автор(ы) : Pavlenko A. N., Surtaev A. S., Tsoi A. N., Koverda V. P., Reshetnikov A. V., Mazheiko N. A., Busov K. A., Skokov V. N.
Заглавие : Disintegration of flows of superheated liquid films and jets [Электронный ресурс]
Место публикации : Journal of Engineering Thermophysics. - 2013. - Vol.22, №3. - С. 174-193
Систем. требования: http://download.springer.com/static/pdf/185/art%253A10.1134%252FS1810232813030028.pdf?auth66=1405766152_ab2f4265a80d9fb3376059ab9464289b&ext=.pdf
Примечания : Библиогр.: с. 190-193 (65 ref.). - 17.07.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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12.

13.

Вид документа : Статья из журнала
Шифр издания : 53/F 17
Автор(ы) : Faizullin M. Z., Vinogradov A. V., Koverda V. P.
Заглавие : Hydrate formation in layers of gas-saturated amorphous ice [Электронный ресурс]
Место публикации : Chemical Engineering Science. - 2015. - Vol. 130. - С. 135-143
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0009250915002043
Примечания : Bibliogr. : p. 142-143 (44 ref.). - 23.12.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): amorphous ice --gas hydrates --carbon dioxide
Аннотация: Layers of amorphous ice saturated with methane, ethane, propane and carbon dioxide were obtained by condensation of molecular beams of rarefied vapor and gas on a substrate cooled with liquid nitrogen. The amorphous state of such objects at low temperatures is stabilized by the high viscosity and the small value of the stationary nucleation rate of the crystal phase. Their heating in condition of high metastability is accompanied by spontaneous explosive crystallization, which leads to the formation of gas hydrates. Glass-transition and crystallization temperatures were determined by changes in their dielectric properties under heating. An increase in the gas content in layers of amorphous ice causes an increase in the crystallization temperature without any significant changes in the glass transition temperature. At atmospheric pressure in a liquid n-pentane medium the retention of gas hydrates was observed up to temperatures close to 273. K. Self-preservation ensured the retention of hydrates in a metastable state at temperatures exceeding considerably their equilibrium dissociation temperatures. Samples of gas hydrates obtained at a maximum gas flow rate during the deposition contained up to 15 mass % of methane, 12 mass % of ethane, 13 mass % of propane, and 23 mass % of carbon dioxide
\\\\expert2\\nbo\\Chemical Engineering Science\\2015, v.130, p.135-143.pdf
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14.

15.

Вид документа : Статья из журнала
Шифр издания : 53/F 17
Автор(ы) : Faizullin M. Z., Vinogradov A. V., Koverda V. P.
Заглавие : Preparation of gas hydrates by nonequilibrium condensation of molecular beams [Электронный ресурс]
Место публикации : Technical Physics Letters . - 2013. - Vol.39, №9. - С. 783-786
Систем. требования: http://www.scopus.com/record/display.url?eid=2-s2.0-84884767082&origin=resultslist&sort=plf-f&src=s&st1=Faizullin&st2=M.+Z.
Примечания : Bibliogr. : p. 786 (16 ref.). - 26.06.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): carbon dioxide--crystallization temperatures--dielectric properties
Аннотация: Layers of amorphous ice saturated with carbon dioxide were prepared by the deposition of molecular beams of water and gas onto a substrate cooled with liquid nitrogen. Their heating is accompanied by glass transition (softening) and subsequent spontaneous crystallization. The glass transition and crystallization temperatures were determined from the change in dielectric properties during heating. The heat effects of the transformations were detected using differential thermal analysis. The crystallization of amorphous layers under conditions of deep metastability leads to the formation of crystalline hydrates. The avalanche nucleation of crystallization sites captures the gas molecules; therefore, they are not displaced by the movement of the crystallization front
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16.

17.

Вид документа : Статья из журнала
Шифр издания : 53/F 17
Автор(ы) : Faizullin M. Z., Vinogradov A. V., Koverda V. P.
Заглавие : Properties of gas hydrates formed by nonequilibrium condensation of molecular beams [Электронный ресурс]
Место публикации : High Temperature. - 2014. - Vol. 52, № 6. - С. 830-839
Систем. требования: http://download.springer.com/static/pdf/706/art%253A10.1134%252FS0018151X14050046.pdf?auth66=1427190695_f46e11cc1867f9174e766f05ba570465&ext=.pdf
Примечания : Bibliogr. : p. 838-839 (36 ref.). - 24.03.15
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): glass-transition --amorphous solids--aqueous-solutions
Аннотация: Low-temperature crystallization of amorphous materials has been analyzed theoretically taking into account nonstationary nucleation. The kinetics of crystallization of amorphous water layers, formed by depositing molecular beams on a substrate cooled by liquid nitrogen, has been investigated by differential thermal analysis. The conditions of gas hydrate formation in low-temperature amorphous-ice layers saturated with carbon dioxide have been studied. The glass-transition and crystallization temperatures of the gas hydrates have been determined from the change in dielectric properties upon heating. Under the deep-metastability conditions, crystallization of water-gas layers leads to the formation of crystallohydrates. Gas molecules are captured by the avalanche-like nucleation of crystallization centers and, therefore, are not displaced by the moving crystal-melt interface. Gas-hydrate samples formed in nonequilibrium water-gas layers are convenient for studying their thermophysical properties
\\\\expert2\\nbo\\High Temperature\\2014, v. 52, N 6, p.830-839.pdf
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18.

19.

Вид документа :
Шифр издания : 53/F 17
Автор(ы) : Faizullin M. Z., Reshetnikov A. V., Koverda V. P.
Заглавие : Synthesis of methane hydrate at low-temperature condensation of molecular beams
Место публикации : Doklady Physics. - 2010. - Vol.55, №8. - С. 388-390
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): amorphous solid water--ice
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20.

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