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Труды сотрудников Института теплофизики УрО РАН
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Общее количество найденных документов : 38
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1.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Hydrate formation in layers of gas-saturated amorphous ice [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // Chemical Engineering Science. - 2015. - Vol. 130. - С. 135-143. - Bibliogr. : p. 142-143 (44 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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2.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Hydrate formation in layers of gas-saturated amorphous ice [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // Chemical Engineering Science. - 2015. - Vol. 130. - С. 135-143. - Bibliogr. : p. 142-143 (44 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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3.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Properties of gas hydrates formed by nonequilibrium condensation of molecular beams [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // High Temperature. - 2014. - Vol. 52, № 6. - С. 830-839. - Bibliogr. : p. 838-839 (36 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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4.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Properties of gas hydrates formed by nonequilibrium condensation of molecular beams [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // High Temperature. - 2014. - Vol. 52, № 6. - С. 830-839. - Bibliogr. : p. 838-839 (36 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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5.
Инвентарный номер: нет.
   
   S 81

   
    Statistical properties of fluctuation boiling centers on the wall of a silylated glass cell for n-pentane near the boundary of attainable superheat [Electronic resource] / S. A. Perminov, E. V. Lipnyagov, G. V. Ermakov, M. A. Parshakova // International Journal of Heat and Mass Transfer. - 2013. - Vol.57, №1. - P429-431. - Bibliogr. : p. 431 (11 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING-UP -- HETEROGENEOUS -- LIQUIDS
Аннотация: High-speed video has been first used to show visually the existence of reproducible fluctuation boiling centers on a solid wall of an experimental cell for liquids superheated to the attainable superheat boundary. The main statistical characteristics of fluctuation centers have been calculated with allowance for censoring. The nonstationarity of a fluctuation process leading to the appearance of a nucleus capable of spontaneous growth has been shown. The change in the density of distribution of probabilities of boiling-up on an ensemble of centers with an increase in their number has been demonstrated. With an increase in the number of centers the probability of observation of large lifetimes of a liquid in the state of superheating decreases rapidly

\\\\expert2\\NBO\\International Journal of Heat and Mass Transfer\\2013, v.57, p.429-431.pdf
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6.
Инвентарный номер: нет.
   
   T 44

   
    The visualization of boiling-up onset of superheated n-pentane in a glass capillary at atmospheric pressure by high-speed video [Electronic resource] / E. V. Lipnyagov, M. A. Parshakova, S. A. Perminov, G. V. Ermakov // International Journal of Heat and Mass Transfer. - 2013. - Vol.60, №1. - P612-615. - Bibliogr. : p. 615 (12 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING-UP -- BUBBLES -- HIGH-SPEED VIDEO
Аннотация: Experimental study of boiling-up of superheated n-pentane at atmospheric pressure in a glass capillary was carried out by high-speed video. From a visual comparison of video frames, we consider the character of vaporization in three temperature ranges corresponding to the following areas of the temperature dependence of the mean lifetime of metastable state: low temperature descending section, "plateau", and boundary of attainable superheat. Temperature at the boundary of attainable superheat was about 2 °C lower than the maximum values reported in the literature and achieved in the more narrow capillaries and 2.5 °C lower than at the homogeneous boundary of attainable superheat

\\\\expert2\\NBO\\International Journal of Heat and Mass Transfer\\2013, v.60, p.612-615.pdf
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7.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Formation of clathrate hydrates under crystallization of gas-saturated amorphous ice [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // International Journal of Heat and Mass Transfer. - 2013. - Vol.65. - С. 649-654. - Bibliogr. : p. 654 (42 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CLATHRATE HYDRATE -- KINETICS -- METHANE
Аннотация: Layers of methane-saturated amorphous ice were obtained by deposition of molecular beams of water and gas on a substrate cooled with liquid nitrogen. Their heating is accompanied by glass transition (softening) and subsequent spontaneous crystallization. The avalanche-type initiation of crystallization centers captures the gas molecules and does not lead to their displacement by the motion of the crystallization front. Under crystallization of amorphous water-gas condensates in conditions of deep metastability the formation of gas hydrates takes place. Glass-transition and crystallization temperatures of the condensates were determined by changes in their dielectric properties under heating. The method of differential thermal analysis has been used to investigate the kinetics of crystallization of amorphous water layers. Properties that characterize the water crystallization kinetics have been determined on the basis of the obtained data on the dependence of the crystallization temperature on the heating rate

\\\\expert2\\NBO\\International Journal of Heat and Mass Transfer\\2013, v.65, p.649-654.pdf
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8.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Preparation of gas hydrates by nonequilibrium condensation of molecular beams / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // Technical Physics Letters . - 2013. - Vol.39, №9. - С. 783-786. - Bibliogr. : p. 786 (16 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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9.
Инвентарный номер: нет.
   
   S 81

   
    Statistical properties of fluctuation boiling centers on the wall of a silylated glass cell for n-pentane near the boundary of attainable superheat [Electronic resource] / S. A. Perminov, E. V. Lipnyagov, G. V. Ermakov, M. A. Parshakova // International Journal of Heat and Mass Transfer. - 2013. - Vol.57, №1. - P429-431. - Bibliogr. : p. 431 (11 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING-UP -- HETEROGENEOUS -- LIQUIDS
Аннотация: High-speed video has been first used to show visually the existence of reproducible fluctuation boiling centers on a solid wall of an experimental cell for liquids superheated to the attainable superheat boundary. The main statistical characteristics of fluctuation centers have been calculated with allowance for censoring. The nonstationarity of a fluctuation process leading to the appearance of a nucleus capable of spontaneous growth has been shown. The change in the density of distribution of probabilities of boiling-up on an ensemble of centers with an increase in their number has been demonstrated. With an increase in the number of centers the probability of observation of large lifetimes of a liquid in the state of superheating decreases rapidly

\\\\expert2\\NBO\\International Journal of Heat and Mass Transfer\\2013, v.57, p.429-431.pdf
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10.
Инвентарный номер: нет.
   
   T 44

   
    The visualization of boiling-up onset of superheated n-pentane in a glass capillary at atmospheric pressure by high-speed video [Electronic resource] / E. V. Lipnyagov, M. A. Parshakova, S. A. Perminov, G. V. Ermakov // International Journal of Heat and Mass Transfer. - 2013. - Vol.60, №1. - P612-615. - Bibliogr. : p. 615 (12 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING-UP -- BUBBLES -- HIGH-SPEED VIDEO
Аннотация: Experimental study of boiling-up of superheated n-pentane at atmospheric pressure in a glass capillary was carried out by high-speed video. From a visual comparison of video frames, we consider the character of vaporization in three temperature ranges corresponding to the following areas of the temperature dependence of the mean lifetime of metastable state: low temperature descending section, "plateau", and boundary of attainable superheat. Temperature at the boundary of attainable superheat was about 2 °C lower than the maximum values reported in the literature and achieved in the more narrow capillaries and 2.5 °C lower than at the homogeneous boundary of attainable superheat

\\\\expert2\\NBO\\International Journal of Heat and Mass Transfer\\2013, v.60, p.612-615.pdf
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