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 1-10    11-18 
1.

Вид документа :
Шифр издания : 53/C 51
Автор(ы) : Chernysheva M. A., Maydanik Yu. F.
Заглавие : Numerical simulation of transient heat and mass transfer in a cylindrical evaporator of a loop heat pipe
Место публикации : International Journal of Heat and Mass Transfer. - 2008. - Vol.51, №17-18. - С. 4204-4215
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): loop heat pipe--lhp start-up--boiling-up
Аннотация: The paper investigates the transient processes of heat and mass transfer in a cylindrical evaporator of a loop heat pipe (LHP) during the device start-up. One of the most “arduous” prestart situations, which is characterized by the absence of a liquid in the evaporator central core and filled vapor removal channels, has been considered. With such liquid distribution a successful start-up of an LHP becomes possible only after formation of the vapor phase in the vapor removal channels and their liberation from the liquid. The aim of the investigations is to determine conditions that ensure the boiling-up of a working fluid in vapor removal channels. The problem was solved by a numerical method. Simulation of start-up regimes has been performed for different heat loads and different structural materials of the evaporator. Copper, titanium and nickel wick have been examined. Calculations have been made for three different working fluids; water, ammonia and acetone. Account has been taken of the conditions of heat exchange between the compensation chamber and surrounding medium
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2.

Вид документа :
Шифр издания : 53/C 51
Автор(ы) : Chernysheva M. A., Maydanik Yu. F.
Заглавие : Numerical simulation of transient heat and mass transfer in a cylindrical evaporator of a loop heat pipe
Место публикации : International Journal of Heat and Mass Transfer. - 2008. - Vol.51, №17-18. - С. 4204-4215
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): loop heat pipe--lhp start-up--boiling-up
Аннотация: The paper investigates the transient processes of heat and mass transfer in a cylindrical evaporator of a loop heat pipe (LHP) during the device start-up. One of the most “arduous” prestart situations, which is characterized by the absence of a liquid in the evaporator central core and filled vapor removal channels, has been considered. With such liquid distribution a successful start-up of an LHP becomes possible only after formation of the vapor phase in the vapor removal channels and their liberation from the liquid. The aim of the investigations is to determine conditions that ensure the boiling-up of a working fluid in vapor removal channels. The problem was solved by a numerical method. Simulation of start-up regimes has been performed for different heat loads and different structural materials of the evaporator. Copper, titanium and nickel wick have been examined. Calculations have been made for three different working fluids; water, ammonia and acetone. Account has been taken of the conditions of heat exchange between the compensation chamber and surrounding medium
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3.

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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4.

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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5.

Вид документа : Статья из журнала
Шифр издания : 53/C 51
Автор(ы) : Chernysheva M. A., Maydanik Yu. F.
Заглавие : 3D-model for heat and mass transfer simulation in flat evaporator of copper-water loop heat pipe
Место публикации : Applied Thermal Engineering. - 2012. - Vol.33-34, №1. - С. 124-134
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): evaporation--flat evaporator--mathematical model
Аннотация: This paper presents a three-dimension mathematical model of a flat evaporator of a loop heat pipe which takes into account the peculiarities of the evaporator configuration and the specific character of a one-side heat load supply. All the main structural elements of the evaporator, such as its body, wick, vapor-removal grooves, barrier layer and compensation chamber, are included in the model. The intensity of heat-exchange processes during evaporation in the active zone is determined by local drops between the temperature at the wick surface and the vapor temperature. The effects of drying the wick in the evaporation zone are also taken into account. The problem was solved by a numerical method. The results of calculations are presented for a copper evaporator and water as a working fluid in the heat load range from 20 to 1100 W. A comparative analysis of calculated and experimental data has been made
\\\\expert2\\NBO\\Applied Thermal Engineering\\2012, v. 33-34, p.124.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/C 51
Автор(ы) : Chernysheva M. A., Maydanik Yu. F.
Заглавие : 3D-model for heat and mass transfer simulation in flat evaporator of copper-water loop heat pipe
Место публикации : Applied Thermal Engineering. - 2012. - Vol.33-34, №1. - С. 124-134
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): evaporation--flat evaporator--mathematical model
Аннотация: This paper presents a three-dimension mathematical model of a flat evaporator of a loop heat pipe which takes into account the peculiarities of the evaporator configuration and the specific character of a one-side heat load supply. All the main structural elements of the evaporator, such as its body, wick, vapor-removal grooves, barrier layer and compensation chamber, are included in the model. The intensity of heat-exchange processes during evaporation in the active zone is determined by local drops between the temperature at the wick surface and the vapor temperature. The effects of drying the wick in the evaporation zone are also taken into account. The problem was solved by a numerical method. The results of calculations are presented for a copper evaporator and water as a working fluid in the heat load range from 20 to 1100 W. A comparative analysis of calculated and experimental data has been made
\\\\expert2\\NBO\\Applied Thermal Engineering\\2012, v. 33-34, p.124.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 53/C 51
Автор(ы) : Chernysheva M. A., Pastukhov V. G., Maydanik Yu. F.
Заглавие : Analysis of heat exchange in the compensation chamber of a loop heat pipe
Место публикации : Energy . - 2013. - С. Article in Press
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): compensation chamber--flat evaporator--heat-and-mass transfer--loop heat pipes
Аннотация: A three-dimensional heat-and-mass transfer model of a flat evaporator of a loop heat pipe has been developed for investigating heat-and-mass in a compensation chamber filled with a liquid. Numerical simulation was implemented using EFDLab® software package in order to predict the temperature distribution of the flat evaporator of a copper-water LHP (loop heat pipe) as well as the flow streamline and velocity field in the compensation chamber as a function of heat load. A computer simulation makes it possible to evaluate the heat exchange at the inner surface of the compensation chamber. Heat exchange data were used as a boundary condition in researching the problem of the drying effect of a wick and a transformation of the evaporating front in the active zone of the flat evaporator. © 2013 Elsevier Ltd. All rights reserved
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8.

Вид документа : Статья из журнала
Шифр издания : 53/C 51
Автор(ы) : Chernysheva M. A., Pastukhov V. G., Maydanik Yu. F.
Заглавие : Analysis of heat exchange in the compensation chamber of a loop heat pipe
Место публикации : Energy . - 2013. - С. Article in Press
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): compensation chamber--flat evaporator--heat-and-mass transfer--loop heat pipes
Аннотация: A three-dimensional heat-and-mass transfer model of a flat evaporator of a loop heat pipe has been developed for investigating heat-and-mass in a compensation chamber filled with a liquid. Numerical simulation was implemented using EFDLab® software package in order to predict the temperature distribution of the flat evaporator of a copper-water LHP (loop heat pipe) as well as the flow streamline and velocity field in the compensation chamber as a function of heat load. A computer simulation makes it possible to evaluate the heat exchange at the inner surface of the compensation chamber. Heat exchange data were used as a boundary condition in researching the problem of the drying effect of a wick and a transformation of the evaporating front in the active zone of the flat evaporator. © 2013 Elsevier Ltd. All rights reserved
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9.

Вид документа : Статья из журнала
Шифр издания : 53/M 43
Автор(ы) : Maydanik Yu. F., Chernysheva M. A., Pastukhov V. G.
Заглавие : Investigation of thermal characteristics of high-capacity loop heat pipes after a long-term storage [Электронный ресурс]
Место публикации : Energy . - 2014. - С. Article in press
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0360544214008755
Примечания : 27.08.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): capacity-- heat-transfer systems--capillary structure,
Аннотация: Repeat thermal tests of two high-capacity LHPs (loop heat pipes) have been conducted after their long-term storage under normal conditions. The first of them 1820 mm long with a capacity of 1200 W and water as a working fluid was made and first tested in 1985. The other device with a length of 2750 mm and a capacity of 800 W, which consisted of two ammonia LHPs joined in series, was made and tested for the first time in 1988. Both the devices were made of stainless steel and equipped with a titanium and nickel capillary structures. The tests, which were conducted in conditions similar to the initial ones, have shown that a long-term storage has not had any considerable impact on the LHP thermal characteristics. Such devices may be used in systems of utilization of low-potential heat and solar energy, and also for heating and cooling various objects
\\\\expert2\\nbo\\Energy\\2014, v. 74, p. 804-809.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 53/M 43
Автор(ы) : Maydanik Yu. F., Chernysheva M. A., Pastukhov V. G.
Заглавие : Investigation of thermal characteristics of high-capacity loop heat pipes after a long-term storage [Электронный ресурс]
Место публикации : Energy . - 2014. - С. Article in press
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0360544214008755
Примечания : 27.08.2014
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): capacity-- heat-transfer systems--capillary structure,
Аннотация: Repeat thermal tests of two high-capacity LHPs (loop heat pipes) have been conducted after their long-term storage under normal conditions. The first of them 1820 mm long with a capacity of 1200 W and water as a working fluid was made and first tested in 1985. The other device with a length of 2750 mm and a capacity of 800 W, which consisted of two ammonia LHPs joined in series, was made and tested for the first time in 1988. Both the devices were made of stainless steel and equipped with a titanium and nickel capillary structures. The tests, which were conducted in conditions similar to the initial ones, have shown that a long-term storage has not had any considerable impact on the LHP thermal characteristics. Such devices may be used in systems of utilization of low-potential heat and solar energy, and also for heating and cooling various objects
\\\\expert2\\nbo\\Energy\\2014, v. 74, p. 804-809.pdf
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