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1.
Инвентарный номер: нет.
   
   C 73

   
    Communication: high speed optical investigations of a character of boiling-up onset [Electronic resource] / A. L Gurashkin, A. A. Starostin, G. V. Ermakov, P. V. Skripov // Journal of Chemical Physics. - 2012. - Vol.136, №2. - P021102. - Bibliogr. : p.
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING -- HEAT TRAHSFER -- MICRO-OPTICS
Аннотация: In this communication, we discuss the phenomenon of attainable superheat of liquid and the peculiarities of its release by spontaneous boiling-up. We have combined the apparatus for superheating, namely, bubble chamber, with a high speed micro-optical method for detailed monitoring of the initial stage of boiling-up. In experiments on the isothermal pressure drop, it was found that the boiling-up onset of n-hexane is accompanied by characteristic step signal. The signal has proved to be typical of the heterogeneous character of boiling-up onset in a whole range of superheating degrees. The performance of the method for investigation of the refractive index and density for superheated liquids as functions of temperature and pressure has been revealed. The experimental error is estimated to be 0.1%.

\\\\expert2\\NBO\\Journal of Chemical Physics\\2012, V.136, p.021102.pdf
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2.
Инвентарный номер: нет.
   
   C 73

   
    Communication: high speed optical investigations of a character of boiling-up onset [Electronic resource] / A. L Gurashkin, A. A. Starostin, G. V. Ermakov, P. V. Skripov // Journal of Chemical Physics. - 2012. - Vol.136, №2. - P021102. - Bibliogr. : p.
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING -- HEAT TRAHSFER -- MICRO-OPTICS
Аннотация: In this communication, we discuss the phenomenon of attainable superheat of liquid and the peculiarities of its release by spontaneous boiling-up. We have combined the apparatus for superheating, namely, bubble chamber, with a high speed micro-optical method for detailed monitoring of the initial stage of boiling-up. In experiments on the isothermal pressure drop, it was found that the boiling-up onset of n-hexane is accompanied by characteristic step signal. The signal has proved to be typical of the heterogeneous character of boiling-up onset in a whole range of superheating degrees. The performance of the method for investigation of the refractive index and density for superheated liquids as functions of temperature and pressure has been revealed. The experimental error is estimated to be 0.1%.

\\\\expert2\\NBO\\Journal of Chemical Physics\\2012, V.136, p.021102.pdf
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3.
Инвентарный номер: нет.
   
   E 70

    Ermakov, G. V.
    Description of heterogeneous boiling up of superheated liquid / G. V. Ermakov, A. L Gurashkin // Journal of Engineering Thermophysics. - 2007. - Vol.16, №4. - С. 231-235
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING -- SUPERHEATED N-HEXANE -- HETEROGENEOUS BOILING
Аннотация: The results of measurements of the average expectation time of boiling up of strongly superheated n-hexane in structures from different finely dispersed powders whose smallest size is about 10 nm by using isotherms and isobars are presented. As was proposed by Academician V.P. Skripov, isotherm sections with the heterogeneous boiling up mechanism were processed with the help of Zhurkov’s formula, which is based on the thermofluctuation hypothesis of solid body strength. Thus, temperature dependences of the characteristic volume, whose excess leads to the system division into macroscopic phases, have been found for the systems studied. An approach dealing with the boiling up of superheated liquid as a fluctuation in a locally isolated microvolume is used to describe the isobars. To calculate the work of formation of the characteristic volume, its values obtained at the processing of isotherms are used. The system of equations for the temperature dependence of the average expectation time of n-hexane boiling up in isobars has three empirical constants. A rather accurate description of isobars is obtained at a proper choice of these constants. The result obtained confirms that the idea of Academician V.P. Skripov is successful

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4.
Инвентарный номер: нет.
   
   E 70

    Ermakov, G. V.
    Description of heterogeneous boiling up of superheated liquid / G. V. Ermakov, A. L Gurashkin // Journal of Engineering Thermophysics. - 2007. - Vol.16, №4. - С. 231-235
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING -- SUPERHEATED N-HEXANE -- HETEROGENEOUS BOILING
Аннотация: The results of measurements of the average expectation time of boiling up of strongly superheated n-hexane in structures from different finely dispersed powders whose smallest size is about 10 nm by using isotherms and isobars are presented. As was proposed by Academician V.P. Skripov, isotherm sections with the heterogeneous boiling up mechanism were processed with the help of Zhurkov’s formula, which is based on the thermofluctuation hypothesis of solid body strength. Thus, temperature dependences of the characteristic volume, whose excess leads to the system division into macroscopic phases, have been found for the systems studied. An approach dealing with the boiling up of superheated liquid as a fluctuation in a locally isolated microvolume is used to describe the isobars. To calculate the work of formation of the characteristic volume, its values obtained at the processing of isotherms are used. The system of equations for the temperature dependence of the average expectation time of n-hexane boiling up in isobars has three empirical constants. A rather accurate description of isobars is obtained at a proper choice of these constants. The result obtained confirms that the idea of Academician V.P. Skripov is successful

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5.
Инвентарный номер: нет.
   
   E 70

    Ermakov, G. V.
    Homogeneous Boundary of the Attainable Superheat of Liquids by the “Theory of Surges” / G. V. Ermakov, M. A. Parshakova, E. V. Lipnyagov // Journal of Physical Chemistry B. - 2001. - Vol.105, №3. - С. 696-701
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HOMOGENEOUS NUCLEATION -- DORING−VOLMER−FRENKEL−ZELDOVICH−KAGAN THEORY -- TOLMAN LENGTH
Аннотация: An alternative theory of homogeneous nucleation based on the theorem on surges has been formulated. This theory gives a steeper temperature dependence of the homogeneous nucleation rate along isobars than that given by the classical Doring−Volmer−Frenkel−Zeldovich−Kagan theory. By the alternative theory, lines of attainable superheat lie much higher than classical ones and are close to the spinodal. Taking into account the dependence of the surface tension on r, i.e., the nucleus radius of curvature, assuming the power dependence of the Tolman length, δ = const/rn, from the theories for different liquids the boundary of attainable superheats moves toward lower temperatures

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6.
Инвентарный номер: нет.
   
   E 70

    Ermakov, G. V.
    Homogeneous Boundary of the Attainable Superheat of Liquids by the “Theory of Surges” / G. V. Ermakov, M. A. Parshakova, E. V. Lipnyagov // Journal of Physical Chemistry B. - 2001. - Vol.105, №3. - С. 696-701
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HOMOGENEOUS NUCLEATION -- DORING−VOLMER−FRENKEL−ZELDOVICH−KAGAN THEORY -- TOLMAN LENGTH
Аннотация: An alternative theory of homogeneous nucleation based on the theorem on surges has been formulated. This theory gives a steeper temperature dependence of the homogeneous nucleation rate along isobars than that given by the classical Doring−Volmer−Frenkel−Zeldovich−Kagan theory. By the alternative theory, lines of attainable superheat lie much higher than classical ones and are close to the spinodal. Taking into account the dependence of the surface tension on r, i.e., the nucleus radius of curvature, assuming the power dependence of the Tolman length, δ = const/rn, from the theories for different liquids the boundary of attainable superheats moves toward lower temperatures

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7.
Инвентарный номер: нет.
   
   E 97

   
    Experimental determination of superheated liquid density by the optical fiber method [Electronic resource] / A. L Gurashkin, A. A. Starostin, A. A. Uimin, A. D. Yampol'skiy, G. V. Ermakov, P. V. Skripov // Journal of Engineering Thermophysics. - 2013. - Vol.22, №3. - P194-202. - Bibliogr. : p. 202 (21 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
OPTICAL FIBER METHOD -- SUPERHEATED LIQUID DENSITY -- LIQUID-VAPOR
Аннотация: An experimental approach to determination of the density of liquid superheated with respect to the liquid-vapor equilibrium temperature, including the range of high degrees of superheating, is developed. The approach is based on application of an optical fiber method combined with a pure bubble chamber. Performance of the method for investigation of the refractive index and density for superheated liquids as functions of temperature and pressure is illustrated in experiments with n-hexane as a reference substance for thermophysical measurements. The relative density measurements are performed with a resolution up to 10-4 at a characteristic time of 1 ms. For absolute measurements, the setup should be calibrated by the known data on the liquid density for the saturation line

\\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2013, V.22, N 3. P. 194-202.pdf
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8.
Инвентарный номер: нет.
   
   E 97

   
    Experimental determination of superheated liquid density by the optical fiber method [Electronic resource] / A. L Gurashkin, A. A. Starostin, A. A. Uimin, A. D. Yampol'skiy, G. V. Ermakov, P. V. Skripov // Journal of Engineering Thermophysics. - 2013. - Vol.22, №3. - P194-202. - Bibliogr. : p. 202 (21 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
OPTICAL FIBER METHOD -- SUPERHEATED LIQUID DENSITY -- LIQUID-VAPOR
Аннотация: An experimental approach to determination of the density of liquid superheated with respect to the liquid-vapor equilibrium temperature, including the range of high degrees of superheating, is developed. The approach is based on application of an optical fiber method combined with a pure bubble chamber. Performance of the method for investigation of the refractive index and density for superheated liquids as functions of temperature and pressure is illustrated in experiments with n-hexane as a reference substance for thermophysical measurements. The relative density measurements are performed with a resolution up to 10-4 at a characteristic time of 1 ms. For absolute measurements, the setup should be calibrated by the known data on the liquid density for the saturation line

\\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2013, V.22, N 3. P. 194-202.pdf
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9.
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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10.
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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