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Общее количество найденных документов : 22
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 1-10    11-20   21-22 
1.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Nucleation of liquid droplets and voids in a stretched Lennard-Jones fcc crystal [Electronic resource] / V. G. Baidakov, A. O. Tipeev // Journal of Chemical Physics. - 2015. - Vol. 143, № 12. - С. 124501/1-124501/11
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR DYNAMICS SIMULATION -- METASTABLE LENNARD-JONES
Аннотация: The method of molecular dynamics simulation has been used to investigate the phase decay of a metastable Lennard-Jones face-centered cubic crystal at positive and negative pressures. It is shown that at high degrees of metastability, crystal decay proceeds through the spontaneous formation and growth of new-phase nuclei. It has been found that there exists a certain boundary temperature. Below this temperature, the crystal phase disintegrates as the result of formation of voids, and above, as a result of formation of liquid droplets. The boundary temperature corresponds to the temperature of cessation of a crystal–liquid phase equilibrium when the melting line comes in contact with the spinodal of the stretched liquid. The results of the simulations are interpreted in the framework of classical nucleation theory. The thermodynamics of phase transitions in solids has been examined with allowance for the elastic energy of stresses arising owing to the difference in the densities of the initial and the forming phases. As a result of the action of elastic forces, at negative pressures, the boundary of the limiting superheating (stretching) of a crystal approaches the spinodal, on which the isothermal bulk modulus of dilatation becomes equal to zero. At the boundary of the limiting superheating (stretching), the shape of liquid droplets and voids is close to the spherical one

\\\\expert2\\nbo\\Journal of Chemical Physics\\2015, v.143, p.124501.pdf
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2.
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   B 16

    Baidakov, V. G.
    Nucleation of liquid droplets and voids in a stretched Lennard-Jones fcc crystal [Electronic resource] / V. G. Baidakov, A. O. Tipeev // Journal of Chemical Physics. - 2015. - Vol. 143, № 12. - С. 124501/1-124501/11
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR DYNAMICS SIMULATION -- METASTABLE LENNARD-JONES
Аннотация: The method of molecular dynamics simulation has been used to investigate the phase decay of a metastable Lennard-Jones face-centered cubic crystal at positive and negative pressures. It is shown that at high degrees of metastability, crystal decay proceeds through the spontaneous formation and growth of new-phase nuclei. It has been found that there exists a certain boundary temperature. Below this temperature, the crystal phase disintegrates as the result of formation of voids, and above, as a result of formation of liquid droplets. The boundary temperature corresponds to the temperature of cessation of a crystal–liquid phase equilibrium when the melting line comes in contact with the spinodal of the stretched liquid. The results of the simulations are interpreted in the framework of classical nucleation theory. The thermodynamics of phase transitions in solids has been examined with allowance for the elastic energy of stresses arising owing to the difference in the densities of the initial and the forming phases. As a result of the action of elastic forces, at negative pressures, the boundary of the limiting superheating (stretching) of a crystal approaches the spinodal, on which the isothermal bulk modulus of dilatation becomes equal to zero. At the boundary of the limiting superheating (stretching), the shape of liquid droplets and voids is close to the spherical one

\\\\expert2\\nbo\\Journal of Chemical Physics\\2015, v.143, p.124501.pdf
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3.
Инвентарный номер: нет.
   
   G 24

    Gasanov, B. M.
    Effect of the concentration and size of droplets of the dispersed phase of an emulsion on the character of heat exchange in a boiling emulsion [Electronic resource] / B. M. Gasanov, N. V. Bulanov // High Temperature. - 2014. - Vol. 52, № 1. - С. 86-92. - Bibliogr. : p. 92 (6 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DROPLETS -- PHASE DISPERSED -- SIZE
Аннотация: Heat transfer from thin platinum wires to emulsions with a low-boiling dispersed phase has been studied experimentally. The appearance, growth, and separation of vapor bubbles at boiling on horizontal and vertical heated surfaces were demonstrated. The dependence of the delay of the beginning of boiling on the concentration of the emulsion and the size of droplets of the dispersed phase were consid

\\\\expert2\\NBO\\High Temperature\\2014, v. 52, N 1, p.86-92.pdf
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4.
Инвентарный номер: нет.
   
   G 24

    Gasanov, B. M.
    Effect of the concentration and size of droplets of the dispersed phase of an emulsion on the character of heat exchange in a boiling emulsion [Electronic resource] / B. M. Gasanov, N. V. Bulanov // High Temperature. - 2014. - Vol. 52, № 1. - С. 86-92. - Bibliogr. : p. 92 (6 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DROPLETS -- PHASE DISPERSED -- SIZE
Аннотация: Heat transfer from thin platinum wires to emulsions with a low-boiling dispersed phase has been studied experimentally. The appearance, growth, and separation of vapor bubbles at boiling on horizontal and vertical heated surfaces were demonstrated. The dependence of the delay of the beginning of boiling on the concentration of the emulsion and the size of droplets of the dispersed phase were consid

\\\\expert2\\NBO\\High Temperature\\2014, v. 52, N 1, p.86-92.pdf
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5.
Инвентарный номер: нет.
   
   G 15

    Galashev, A. E.
    Molecular-dynamic modeling of ultradisperse water in the earth atmosphere [Электронный ресурс] / A. E. Galashev // High Temperature. - 2010. - Vol.48, №4. - P518-526
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ATMOSPHERIC WATER -- DYNAMIC CALCULATIONS -- DYNAMIC CALCULATIONS
Аннотация: Molecular-dynamic calculations are used for analyzing the vapor quality of water monomers, clusters, droplets, and crystals in the Earth atmosphere. It is demonstrated that the integral intensity of absorption of infrared radiation for the initial series of water clusters does not increase with their size and stays smaller than the respective characteristic for free water molecule. The anti-greenhouse effect developed by clusters is defined as the difference between the greenhouse effects exhibited by free molecules of water making up the clusters and by the clusters proper. The value of anti-greenhouse effect is 3.6 K, and the greenhouse effect of atmospheric water clusters is estimated at 1.1

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6.
Инвентарный номер: нет.
   
   G 15

    Galashev, A. E.
    Molecular-dynamic modeling of ultradisperse water in the earth atmosphere [Электронный ресурс] / A. E. Galashev // High Temperature. - 2010. - Vol.48, №4. - P518-526
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ATMOSPHERIC WATER -- DYNAMIC CALCULATIONS -- DYNAMIC CALCULATIONS
Аннотация: Molecular-dynamic calculations are used for analyzing the vapor quality of water monomers, clusters, droplets, and crystals in the Earth atmosphere. It is demonstrated that the integral intensity of absorption of infrared radiation for the initial series of water clusters does not increase with their size and stays smaller than the respective characteristic for free water molecule. The anti-greenhouse effect developed by clusters is defined as the difference between the greenhouse effects exhibited by free molecules of water making up the clusters and by the clusters proper. The value of anti-greenhouse effect is 3.6 K, and the greenhouse effect of atmospheric water clusters is estimated at 1.1

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7.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Experimental investigations of superheated and supercooled water (review of papers of the school of the academician V. P. Skripov) / V. G. Baidakov // NATO Science for Peace and Security Series A: Chemistry and Biology. - 2010. - С. 253-270
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SOUND VELOCITY -- HEAVY WATER -- SUPERHEATING
Аннотация: The review presents the results of experimental investigations of nucleation in superheated light and heavy water in the range of nucleation rates from 104 to 1029 s−1m−3. A study is performed of the kinetics of crystallization of droplets of superheated water and amorphous water layers. Measurements have been made of the density, sound velocity, dielectric constant of light and heavy water in the vicinity of the phase equilibrium line with deep entry into the region of metastable (superheated) states. The local and integral characteristics of streams of boiling-up water flowing out into the atmosphere through a short channel have been investigated. One can see the determining role of a vapor phase in such a process at a temperature above 0.9T c , where T c is the temper-temperature at the critical point

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8.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Experimental investigations of superheated and supercooled water (review of papers of the school of the academician V. P. Skripov) / V. G. Baidakov // NATO Science for Peace and Security Series A: Chemistry and Biology. - 2010. - С. 253-270
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SOUND VELOCITY -- HEAVY WATER -- SUPERHEATING
Аннотация: The review presents the results of experimental investigations of nucleation in superheated light and heavy water in the range of nucleation rates from 104 to 1029 s−1m−3. A study is performed of the kinetics of crystallization of droplets of superheated water and amorphous water layers. Measurements have been made of the density, sound velocity, dielectric constant of light and heavy water in the vicinity of the phase equilibrium line with deep entry into the region of metastable (superheated) states. The local and integral characteristics of streams of boiling-up water flowing out into the atmosphere through a short channel have been investigated. One can see the determining role of a vapor phase in such a process at a temperature above 0.9T c , where T c is the temper-temperature at the critical point

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9.
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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10.
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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