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 Найдено в других БД:Труды сотрудников Института органического синтеза УрО РАН (2)
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Общее количество найденных документов : 14
Показаны документы с 1 по 10
 1-10    11-14 
1.
Инвентарный номер: нет.
   
   B 93

    Bulanov, N. V.
    Peculiarities of boiling of emulsions with a low-boiling disperse phase [Electronic resource] / N. V. Bulanov, B. M. Gasanov // International Journal of Heat and Mass Transfer. - 2008. - Vol. 51, № 7-8. - P1628-1632
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING -- NUCLEATION SITE -- HEAT TRAHSFER -- ACTIVATION OF NUCLEATION SITES -- SUPERHEATED LIQUIDS
Аннотация: The heat transfer from thin wires to emulsions with a disperse phase formed from a liquid whose boiling temperature is much lower than the boiling temperature of the disperse medium was investigated. Experiments were conducted at atmospheric pressure on vertical and horizontal wires from 50 to 100 ?m in diameter with n-pentane/glycerine, diethyl ether/water, and freon-113/water and water/oil emulsions.??It was possible to describe the experimental data obtained by one analytical dependence Nu = AArPrM?1[1 ? exp(?JVt)]. The dependence presented was obtained from the proposed model of the chain branched activation of boiling centers in droplets of a superheated liquid. In this case the coefficient J acquires the meaning of the activation rate of these centers.??

\\\\Expert2\\NBO\\International Journal of Heat and Mass Transfer\\2008, v.51, p.1628.pdf
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2.
Инвентарный номер: нет.
   
   D 82

   
    Drop on a Hot Plate: The Appearance of 1/f Noise at the Transition to the Ball-Shaped State [] / V. P. Skripov, V. N. Vinogradov, A. V. Skokov, V. P. Reshetnikov, V. P. Koverda // Technical Physics. - 2003. - V. 48, N 6. - С. 682-684 . - ISSN 1063-7842
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
PHYSICS -- DROPS -- 1/f-NOISE -- BALL-SHAPED STATE -- EVAPORATION OF PENTANE -- PENTANE -- EVAPORATION OF HEXANE -- HEXANE -- EVAPORATION OF WATER -- WATER -- H2O
Аннотация: The evaporation of pentane, hexane, and water drops from a horizontal heating surface is studied experimentally. The temperature at which the drops take a completely spherical shape correlates with limit superheat temperatures under quasi-static conditions, suggesting dynamic burnout. Fluctuations in transient regimes are measured by optical and resistive methods. It is found that the spectral densities of the fluctuation intensity are of a flicker nature. Such behavior is associated with percolation in a set of nonequilibrium phase transitions

\\\\Expert2\\NBO\\Technical Physics\\2003, v.48, N 10, p.682.pdf
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3.
Инвентарный номер: нет.
   
   E 97

   
    Experimental testing of liquid boiling-up homogeneity near the boundary of the attainable superheating [Electronic resource] / E. V. Lipnyagov, S. A. Perminov, G. V. Ermakov, B. M. Smolyak // Thermophysics and Aeromtchanics. - 2009. - Vol.16, №3. - P445-457. - Bibliogr. : p. 457 (20 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SUPERHEATING -- LIQUID -- N-PENTANE
Аннотация: Results of measured average expectancy time of n-pentane and n-hexane boiling-up to the boundary of attainable superheating are presented. Experiments have been carried out in glass capillaries with substantially decreasing value of the superheated liquid volume for the preset metastable state (p, T = const). Obtained data fail to prove correlation 1 JVῑ = following from the condition of homogeneity and stationarity of the random process resulting in the superheated liquid boiling-up (J is the frequency of homogenous nucleation, V is the volume of the superheated liquid, ῑ is the average life time). Thus, experiments on superheated liquid boiling-up kinetics bound with measurements of average life time in glass capillaries cannot serve a proof of the validity of classical theory of nucleation for superheated liquids since one of the ground conditions — boiling-up homogeneity — is not met

\\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 3. P. 445-457.pdf
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4.
Инвентарный номер: нет.
   
   E 97

   
    Experimental determination of superheated liquids boiling-up expectancy time probabilities distribution [Electronic resource] / E. V. Lipnyagov, S. A. Perminov, G. V. Ermakov, B. M. Smolyak // Thermophysics and Aeromtchanics. - 2009. - Vol.16, №4. - P627-633. - Bibliogr. : p. 633 (16 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUID -- N-PENTANE -- BOILING-UP
Аннотация: Results of statistical measurement of n-pentane and n-hexane boiling-up expectancy time near the boundary of attainable superheating are presented. Experiments were carried out in glass capillaries with various volumes of superheated liquid. Several samples with the volume from 100 to 200 measurements of life time for preset metastable state have been obtained (p, T = const). Their histograms contain small empty initial section, maximum and long “tail” in the area of large times. Non-monotonous dependence of probability distribution density on time proves non-stationary character of the random process resulting in the production of supercritical embryo. Two simple approximations of non-stationary nucleation flow well describing experimental data have been considered. For exponential distribution, the probabilities of experimentally found peculiarities of boiling-up expectancy time distribution density have been evaluated; they prove incompatibility of this distribution with the experimental one

\\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 4. P. 627-633.pdf
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5.
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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6.
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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7.
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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8.
Инвентарный номер: нет.
   
   B 93

    Bulanov, N. V.
    Peculiarities of boiling of emulsions with a low-boiling disperse phase [Electronic resource] / N. V. Bulanov, B. M. Gasanov // International Journal of Heat and Mass Transfer. - 2008. - Vol. 51, № 7-8. - P1628-1632
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING -- NUCLEATION SITE -- HEAT TRAHSFER -- ACTIVATION OF NUCLEATION SITES -- SUPERHEATED LIQUIDS
Аннотация: The heat transfer from thin wires to emulsions with a disperse phase formed from a liquid whose boiling temperature is much lower than the boiling temperature of the disperse medium was investigated. Experiments were conducted at atmospheric pressure on vertical and horizontal wires from 50 to 100 ?m in diameter with n-pentane/glycerine, diethyl ether/water, and freon-113/water and water/oil emulsions.??It was possible to describe the experimental data obtained by one analytical dependence Nu = AArPrM?1[1 ? exp(?JVt)]. The dependence presented was obtained from the proposed model of the chain branched activation of boiling centers in droplets of a superheated liquid. In this case the coefficient J acquires the meaning of the activation rate of these centers.??

\\\\Expert2\\NBO\\International Journal of Heat and Mass Transfer\\2008, v.51, p.1628.pdf
Найти похожие
9.
Инвентарный номер: нет.
   
   D 82

   
    Drop on a Hot Plate: The Appearance of 1/f Noise at the Transition to the Ball-Shaped State [] / V. P. Skripov, V. N. Vinogradov, A. V. Skokov, V. P. Reshetnikov, V. P. Koverda // Technical Physics. - 2003. - V. 48, N 6. - С. 682-684 . - ISSN 1063-7842
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
PHYSICS -- DROPS -- 1/f-NOISE -- BALL-SHAPED STATE -- EVAPORATION OF PENTANE -- PENTANE -- EVAPORATION OF HEXANE -- HEXANE -- EVAPORATION OF WATER -- WATER -- H2O
Аннотация: The evaporation of pentane, hexane, and water drops from a horizontal heating surface is studied experimentally. The temperature at which the drops take a completely spherical shape correlates with limit superheat temperatures under quasi-static conditions, suggesting dynamic burnout. Fluctuations in transient regimes are measured by optical and resistive methods. It is found that the spectral densities of the fluctuation intensity are of a flicker nature. Such behavior is associated with percolation in a set of nonequilibrium phase transitions

\\\\Expert2\\NBO\\Technical Physics\\2003, v.48, N 10, p.682.pdf
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10.
Инвентарный номер: нет.
   
   E 97

   
    Experimental testing of liquid boiling-up homogeneity near the boundary of the attainable superheating [Electronic resource] / E. V. Lipnyagov, S. A. Perminov, G. V. Ermakov, B. M. Smolyak // Thermophysics and Aeromtchanics. - 2009. - Vol.16, №3. - P445-457. - Bibliogr. : p. 457 (20 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SUPERHEATING -- LIQUID -- N-PENTANE
Аннотация: Results of measured average expectancy time of n-pentane and n-hexane boiling-up to the boundary of attainable superheating are presented. Experiments have been carried out in glass capillaries with substantially decreasing value of the superheated liquid volume for the preset metastable state (p, T = const). Obtained data fail to prove correlation 1 JVῑ = following from the condition of homogeneity and stationarity of the random process resulting in the superheated liquid boiling-up (J is the frequency of homogenous nucleation, V is the volume of the superheated liquid, ῑ is the average life time). Thus, experiments on superheated liquid boiling-up kinetics bound with measurements of average life time in glass capillaries cannot serve a proof of the validity of classical theory of nucleation for superheated liquids since one of the ground conditions — boiling-up homogeneity — is not met

\\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 3. P. 445-457.pdf
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