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1.
Инвентарный номер: нет.
   
   C 51

    Chenysheva, M. A.
    Simulation of thermal processes in a flat evaporator of a copper-water loop heat pipe under uniform and concentrated heating [Электронный ресурс] / M. A. Chenysheva, Yu. F. Maydanik // International Journal of Heat and Mass Transfer. - 2012. - Vol.55, № 25-26. - P7385-7397
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
3D MODEL -- EVAPORATION -- FLAT EVAPORATOR
Аннотация: A 3D model has been developed for investigating heat and mass transfer in a flat evaporator of a copper-water loop heat pipe. It takes into account heat-transfer processes in the active zone, the barrier layer of the wick, the wall and the compensation chamber. The problem was solved by the finite difference method with the use of a nonuniform grid adapted to the configuration of the flat evaporator and its geometric peculiarities. Investigations have been carried out for understanding the effect of the heating zone size on heat distribution in the evaporator. The heating area was 9 cm 2 with a uniform heat supply and 1 cm 2 with a concentrated one. Numerical simulation has been performed for a heat load range from 20 to 1100 W. Data have shown that a decrease in the heating area at a fixed heat load results in both increasing temperature on the evaporator wall under the heater and local wick draining in the active zone. The results of the model have been verified using results of experimental tests.

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2.
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   C 51

    Chenysheva, M. A.
    Simulation of thermal processes in a flat evaporator of a copper-water loop heat pipe under uniform and concentrated heating [Электронный ресурс] / M. A. Chenysheva, Yu. F. Maydanik // International Journal of Heat and Mass Transfer. - 2012. - Vol.55, № 25-26. - P7385-7397
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
3D MODEL -- EVAPORATION -- FLAT EVAPORATOR
Аннотация: A 3D model has been developed for investigating heat and mass transfer in a flat evaporator of a copper-water loop heat pipe. It takes into account heat-transfer processes in the active zone, the barrier layer of the wick, the wall and the compensation chamber. The problem was solved by the finite difference method with the use of a nonuniform grid adapted to the configuration of the flat evaporator and its geometric peculiarities. Investigations have been carried out for understanding the effect of the heating zone size on heat distribution in the evaporator. The heating area was 9 cm 2 with a uniform heat supply and 1 cm 2 with a concentrated one. Numerical simulation has been performed for a heat load range from 20 to 1100 W. Data have shown that a decrease in the heating area at a fixed heat load results in both increasing temperature on the evaporator wall under the heater and local wick draining in the active zone. The results of the model have been verified using results of experimental tests.

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3.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    3D-model for heat and mass transfer simulation in flat evaporator of copper-water loop heat pipe [Electronic resource] / M. A. Chernysheva, Yu. F. Maydanik // Applied Thermal Engineering. - 2012. - Vol.33-34, №1. - P124-134
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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4.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    3D-model for heat and mass transfer simulation in flat evaporator of copper-water loop heat pipe [Electronic resource] / M. A. Chernysheva, Yu. F. Maydanik // Applied Thermal Engineering. - 2012. - Vol.33-34, №1. - P124-134
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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5.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    Analysis of heat exchange in the compensation chamber of a loop heat pipe [Электронный ресурс] / M. A. Chernysheva, V. G. Pastukhov, Yu. F. Maydanik // Energy . - 2013. - Article in Press
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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6.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    Analysis of heat exchange in the compensation chamber of a loop heat pipe [Электронный ресурс] / M. A. Chernysheva, V. G. Pastukhov, Yu. F. Maydanik // Energy . - 2013. - Article in Press
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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7.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    Copper-water loop heat pipes for energy-efficient cooling systems of supercomputers / M. A. Chernysheva, S. Yushakova, Yu. F. Maydanik // Energy . - 2014. - С. 534-542. - Bibliogr. : p. 542 (16 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
COOLING SYSTEM -- OPERATING TEMPERATURE -- LOOP HEAT PIPE
Аннотация: An implementation of a cooling system with a loop heat pipe for thermal control of supercomputers is considered. For this purpose two copper-water loop heat pipes (LHPs) with an effective length of 400mm and ID/OD diameters of the vapor lines of 3/4 and 4/5mm correspondingly were designed and tested. The LHPs were equipped with a flat-oval evaporator with one-sided heat supply. The evaporator had a thickness of 7mm, a length (including the compensation chamber) of 80mm and a width of 42mm. The influence of the cooling temperature of the condenser on the LHP operating characteristics was the central issue of this research. Tests were conducted in the range of the cooling temperature from 20 to 80°C. The heat load supplied to the evaporator was varied from 20 to 600W. A mathematical model for prediction of the LHP's operating temperature has been developed. It takes into consideration three operating modes of a loop heat pipe. Modeling results and their analysis are presented

\\\\expert2\\nbo\\Energy\\2014, v. 69, p. 534-542.pdf
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8.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    Copper-water loop heat pipes for energy-efficient cooling systems of supercomputers / M. A. Chernysheva, S. Yushakova, Yu. F. Maydanik // Energy . - 2014. - С. 534-542. - Bibliogr. : p. 542 (16 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
COOLING SYSTEM -- OPERATING TEMPERATURE -- LOOP HEAT PIPE
Аннотация: An implementation of a cooling system with a loop heat pipe for thermal control of supercomputers is considered. For this purpose two copper-water loop heat pipes (LHPs) with an effective length of 400mm and ID/OD diameters of the vapor lines of 3/4 and 4/5mm correspondingly were designed and tested. The LHPs were equipped with a flat-oval evaporator with one-sided heat supply. The evaporator had a thickness of 7mm, a length (including the compensation chamber) of 80mm and a width of 42mm. The influence of the cooling temperature of the condenser on the LHP operating characteristics was the central issue of this research. Tests were conducted in the range of the cooling temperature from 20 to 80°C. The heat load supplied to the evaporator was varied from 20 to 600W. A mathematical model for prediction of the LHP's operating temperature has been developed. It takes into consideration three operating modes of a loop heat pipe. Modeling results and their analysis are presented

\\\\expert2\\nbo\\Energy\\2014, v. 69, p. 534-542.pdf
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9.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    Effect of external factors on the operating characteristics of a copper–water loop heat pipe [Electronic resource] / M. A. Chernysheva, S. Yushakova, Yu. F. Maydanik // International Journal of Heat and Mass Transfer. - 2015. - С. 297-304. - Bibliogr. : p. 304 (13 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPES -- OPERATING TEMPERATURE -- COOLING SYSTEM OF COMPUTER SERVERS
Аннотация: The paper presents operating characteristics of a copper–water loop heat pipe (LHP) developed for the use in cooling systems of servers for heat transfer from heat-tensioned elements of electronics to peripheral sections or an outer circulation cooling loop beyond the server. The LHP effective length was 400 mm. The device was provided with a flat-oval evaporator. Its thickness, width and length were equal to 7 mm, 42 mm and 80 mm, respectively. The evaporator was equipped with a thermal interface whose heating zone measured 30 mm × 30 mm. The aim of the research work was to determine the effect of external factors such as the device orientation, the condenser cooling temperature and the condition of heat exchange with the surroundings, on the LHP operating performances. The tests were conducted at the unfavorable LHP slopes from 0° to +60° and heat-sink temperatures from 20 °C to 80 °C, and also in different conditions of heat exchange with the outside ambient. The investigation results are presented in the range of heat loads from 20 to 600 W. It has been shown that the slope dependence of the LHP heat-transfer capacity decreases with increasing heat-sink temperature and practically disappears at a value of the latter of 80 °C. In this case the LHP thermal resistance decreases too and reaches a minimum value of 0.02 °C/W in the range of heat loads from 400 to 600 W.

\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 81, p.297-304.pdf
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10.
Инвентарный номер: нет.
   
   C 51

    Chernysheva, M. A.
    Effect of external factors on the operating characteristics of a copper–water loop heat pipe [Electronic resource] / M. A. Chernysheva, S. Yushakova, Yu. F. Maydanik // International Journal of Heat and Mass Transfer. - 2015. - С. 297-304. - Bibliogr. : p. 304 (13 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPES -- OPERATING TEMPERATURE -- COOLING SYSTEM OF COMPUTER SERVERS
Аннотация: The paper presents operating characteristics of a copper–water loop heat pipe (LHP) developed for the use in cooling systems of servers for heat transfer from heat-tensioned elements of electronics to peripheral sections or an outer circulation cooling loop beyond the server. The LHP effective length was 400 mm. The device was provided with a flat-oval evaporator. Its thickness, width and length were equal to 7 mm, 42 mm and 80 mm, respectively. The evaporator was equipped with a thermal interface whose heating zone measured 30 mm × 30 mm. The aim of the research work was to determine the effect of external factors such as the device orientation, the condenser cooling temperature and the condition of heat exchange with the surroundings, on the LHP operating performances. The tests were conducted at the unfavorable LHP slopes from 0° to +60° and heat-sink temperatures from 20 °C to 80 °C, and also in different conditions of heat exchange with the outside ambient. The investigation results are presented in the range of heat loads from 20 to 600 W. It has been shown that the slope dependence of the LHP heat-transfer capacity decreases with increasing heat-sink temperature and practically disappears at a value of the latter of 80 °C. In this case the LHP thermal resistance decreases too and reaches a minimum value of 0.02 °C/W in the range of heat loads from 400 to 600 W.

\\\\expert2\\nbo\\International Journal of Heat and Mass Transfer\\2015, v. 81, p.297-304.pdf
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