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Общее количество найденных документов : 64
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1.

Вид документа : Статья из журнала
Шифр издания : 53/Б 18
Автор(ы) : Байдаков В. Г., Каверин А.М.
Заглавие : Достижимый перегрев жидких растворов гелий-кислород
Параллельн. заглавия :Attainable Superheating of Helium-Oxygen Solutions
Место публикации : Теплофизика высоких температур. - 2000. - Т. 38, N6. - С. 886-894
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): o2--he2--кислород--гелий--гелий-кислород--перегрев--перегрев достижимый--растворы--растворы жидкие--зародышеобразование--кинетика зародышеобразования--растворы газонасыщенные--давление--концентрация раствора--зависимости температурные--время жизни раствора--состояние метастабильное--состояние перегретое--нуклеация гомогенная--размер зародышей
Аннотация: Представлены результаты экспериментальных исследований кинетики зародышеобразования в газонасыщенных растворах гелий-кислород. При фиксированных давлениях 1.171 и 1.667 МПа и нескольких значениях концентрации определены температурные зависимости среднего времени жизни раствора в метастабильном (перегретом) состоянии. Экспериментальные данные сопоставляются с теорией гомогенной нуклеации в макроскопическом приближении с учетом зависимости свойств зародышей от их размера
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2.

Вид документа : Статья из журнала
Шифр издания : 53/Б 18
Автор(ы) : Байдаков В. Г., Каверин А.М.
Заглавие : Достижимый перегрев жидких растворов гелий-кислород
Параллельн. заглавия :Attainable Superheating of Helium-Oxygen Solutions
Место публикации : Теплофизика высоких температур. - 2000. - Т. 38, N6. - С. 886-894
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): o2--he2--кислород--гелий--гелий-кислород--перегрев--перегрев достижимый--растворы--растворы жидкие--зародышеобразование--кинетика зародышеобразования--растворы газонасыщенные--давление--концентрация раствора--зависимости температурные--время жизни раствора--состояние метастабильное--состояние перегретое--нуклеация гомогенная--размер зародышей
Аннотация: Представлены результаты экспериментальных исследований кинетики зародышеобразования в газонасыщенных растворах гелий-кислород. При фиксированных давлениях 1.171 и 1.667 МПа и нескольких значениях концентрации определены температурные зависимости среднего времени жизни раствора в метастабильном (перегретом) состоянии. Экспериментальные данные сопоставляются с теорией гомогенной нуклеации в макроскопическом приближении с учетом зависимости свойств зародышей от их размера
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3.

Вид документа :
Шифр издания : 53/P 34
Автор(ы) : Pavlov P. A.
Заглавие : Thermodynamic crisis of boiling
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 145-154
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): vapor-- loop heat pipe
Аннотация: The procedure of calculation of the dynamics of rapid near-wall vaporization near a metallic heater is considered. A physical model of explosive boiling-up on bubbles of fluctuation origin is used. The model is limited to regimes when the motion of bubbles can be ignored and convective flows do not have enough time to develop. It is assumed that the dry spot under a bubble thermally insulates the heater wall. The heat removal is provided by the vicinity of the wetting line (WL). An analytical calculation has become possible on the basis of the well-known exact solution to the problem of the temperature field near the wetting line. Generalization of this solution has led to two new problems. These are the problem of allowance for the difference of the dynamic wetting angle from the right angle and that of allowance for thermocapillary flows. A numerical comparison of the results of calculation of the dry area with the use of different methods of allowing for the “tightness” effect in the dynamics of bubble generation and growth has been made. The evolution of bubbles from their generation to growth limited by the heat supply has been investigated. It has been found that the transition stage in the development of bubbles from Rayleigh to thermal ones is of considerable importance in the processes of explosive boiling-up. The dynamics of change in the dry area and wetting line length prior to the stage of bubble merging into a vapor film has been calculated. A condition of passage of the heat flux through a maximum is found. The applicability of the idea of thermodynamic crisis to calculations of miniature devices is justified. The problem of constructing a model to calculate the interphase surface shape near the wetting line under a developed thermocapillary flow and considerable reactive forces of the vapor flow is formulated. The model is in good agreement with the results of experiments on pulsed superheating of liquids at a rate higher than 1 K/μs
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4.

Вид документа :
Шифр издания : 53/P 34
Автор(ы) : Pavlov P. A.
Заглавие : Thermodynamic crisis of boiling
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 145-154
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): vapor-- loop heat pipe
Аннотация: The procedure of calculation of the dynamics of rapid near-wall vaporization near a metallic heater is considered. A physical model of explosive boiling-up on bubbles of fluctuation origin is used. The model is limited to regimes when the motion of bubbles can be ignored and convective flows do not have enough time to develop. It is assumed that the dry spot under a bubble thermally insulates the heater wall. The heat removal is provided by the vicinity of the wetting line (WL). An analytical calculation has become possible on the basis of the well-known exact solution to the problem of the temperature field near the wetting line. Generalization of this solution has led to two new problems. These are the problem of allowance for the difference of the dynamic wetting angle from the right angle and that of allowance for thermocapillary flows. A numerical comparison of the results of calculation of the dry area with the use of different methods of allowing for the “tightness” effect in the dynamics of bubble generation and growth has been made. The evolution of bubbles from their generation to growth limited by the heat supply has been investigated. It has been found that the transition stage in the development of bubbles from Rayleigh to thermal ones is of considerable importance in the processes of explosive boiling-up. The dynamics of change in the dry area and wetting line length prior to the stage of bubble merging into a vapor film has been calculated. A condition of passage of the heat flux through a maximum is found. The applicability of the idea of thermodynamic crisis to calculations of miniature devices is justified. The problem of constructing a model to calculate the interphase surface shape near the wetting line under a developed thermocapillary flow and considerable reactive forces of the vapor flow is formulated. The model is in good agreement with the results of experiments on pulsed superheating of liquids at a rate higher than 1 K/μs
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5.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : The attainable superheating of nitrogen-helium solutions
Место публикации : Russian Journal of Physical Chemistry A. - 2009. - Vol.83, №10. - С. 1751-1756
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): homogeneous nucleation--oxygen--krypton
Аннотация: The nucleation of the vapor phase in superheated nitrogen-helium liquid solutions was studied by lifetime measurements. The temperature dependences of the mean lifetime of metastable solutions were obtained at p = 0.5 and 1.0 MPa and several concentrations. The nucleation rate J was found to vary from 10(4) to 10(8) s(-1) m(-3). The adsorption of the high-volatility component on the metastable liquid-critical bubble boundary was shown to play a determining role in decreasing the temperature of the attainable solution super-heating as the solution concentration increased. The experimental data were compared with homogeneous nucleation theory. Systematic discrepancies were obtained; these discrepancies were related to the influence of the size effect on the surface tension of a nucleus and the work of its formation
\\\\Expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2009, v. 83, N 10, p.1751.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : The attainable superheating of nitrogen-helium solutions
Место публикации : Russian Journal of Physical Chemistry A. - 2009. - Vol.83, №10. - С. 1751-1756
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): homogeneous nucleation--oxygen--krypton
Аннотация: The nucleation of the vapor phase in superheated nitrogen-helium liquid solutions was studied by lifetime measurements. The temperature dependences of the mean lifetime of metastable solutions were obtained at p = 0.5 and 1.0 MPa and several concentrations. The nucleation rate J was found to vary from 10(4) to 10(8) s(-1) m(-3). The adsorption of the high-volatility component on the metastable liquid-critical bubble boundary was shown to play a determining role in decreasing the temperature of the attainable solution super-heating as the solution concentration increased. The experimental data were compared with homogeneous nucleation theory. Systematic discrepancies were obtained; these discrepancies were related to the influence of the size effect on the surface tension of a nucleus and the work of its formation
\\\\Expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2009, v. 83, N 10, p.1751.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 53/T 34
Автор(ы) : Nikitin E. D., Pavlov P. A., Popov A. P.
Заглавие : Temperature of Attainable Superheating of Some Commercial Petroleum Products
Место публикации : High Temperature. - 2001. - Vol. 39, N 1. - С. 93-96: il.
Примечания : Bibliogr: p. 100
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): temperature--temperature of attainable superheating--superheating--attainable superheating--petroleum products
\\\\Expert2\\NBO\\High Temperature\\2001, v.39, p.93.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 53/T 34
Автор(ы) : Nikitin E. D., Pavlov P. A., Popov A. P.
Заглавие : Temperature of Attainable Superheating of Some Commercial Petroleum Products
Место публикации : High Temperature. - 2001. - Vol. 39, N 1. - С. 93-96: il.
Примечания : Bibliogr: p. 100
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): temperature--temperature of attainable superheating--superheating--attainable superheating--petroleum products
\\\\Expert2\\NBO\\High Temperature\\2001, v.39, p.93.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kaverin A. M.
Заглавие : Superheating of liquid xenon in metal tubes
Место публикации : Journal of Chemical Physics. - 2009. - Vol.131, №6. - С. Artical Number 064708
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): line-tension--surface tension--nucleation
Аннотация: The method of measuring the lifetime has been used to investigate the kinetics of spontaneous boiling-up of superheated xenon in copper tubes. In experiments the temperature dependence of the mean lifetime has been determined at pressures of 1.48 and 1.98 MPa. The data obtained have been compared with homogeneous nucleation theory. It has been found that experimental values of the attainable superheating temperature and the derivative (partial derivative ln J/partial derivative T)(p) are systematically lower than their theoretical values. A description of experimental data in the framework of heterogeneous nucleation theory has shown that for the agreement of theory and experiment with the use of a macroscopic model of nucleation on a smooth surface it is necessary to take the value of the equilibrium contact angle theta(0) equal to 70 degrees, which is not a characteristic for a xenon-metal system. Taking into account the contribution of the energy of the three-phase contact solid wall-liquid-gas in a microscopic nucleation model makes it possible to reconcile heterogeneous nucleation theory and experimental data at a contact angle theta(0) close to zero, with the linear tension taken equal to -6x10(-12) J/m and the microscopic contact angle theta(*)similar or equal to 57 degrees. The number of weakened sites, on which bubbles may form, is always smaller than the number of molecules adjacent to the solid wall
\\\\Expert2\\nbo\\Journal of Chemical Physics\\2009, v.131, p.064708.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kaverin A. M.
Заглавие : Superheating of liquid xenon in metal tubes
Место публикации : Journal of Chemical Physics. - 2009. - Vol.131, №6. - С. Artical Number 064708
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): line-tension--surface tension--nucleation
Аннотация: The method of measuring the lifetime has been used to investigate the kinetics of spontaneous boiling-up of superheated xenon in copper tubes. In experiments the temperature dependence of the mean lifetime has been determined at pressures of 1.48 and 1.98 MPa. The data obtained have been compared with homogeneous nucleation theory. It has been found that experimental values of the attainable superheating temperature and the derivative (partial derivative ln J/partial derivative T)(p) are systematically lower than their theoretical values. A description of experimental data in the framework of heterogeneous nucleation theory has shown that for the agreement of theory and experiment with the use of a macroscopic model of nucleation on a smooth surface it is necessary to take the value of the equilibrium contact angle theta(0) equal to 70 degrees, which is not a characteristic for a xenon-metal system. Taking into account the contribution of the energy of the three-phase contact solid wall-liquid-gas in a microscopic nucleation model makes it possible to reconcile heterogeneous nucleation theory and experimental data at a contact angle theta(0) close to zero, with the linear tension taken equal to -6x10(-12) J/m and the microscopic contact angle theta(*)similar or equal to 57 degrees. The number of weakened sites, on which bubbles may form, is always smaller than the number of molecules adjacent to the solid wall
\\\\Expert2\\nbo\\Journal of Chemical Physics\\2009, v.131, p.064708.pdf
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