Центральная Научная Библиотека УрО РАН

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   P 93

    Protsenko, S. P.
    A molecular-dynamic study of a system of Lennard-Jones disks in the region of the liquid-gas transition: dynamics, structure, thermodynamic properties [Text] / S. P. Protsenko, V. G. Baidakov // Fluid Mechanics - Soviet Research. - 1987. - V.16, N5. - P66-78

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
СИСТЕМА ЛЕННАРД-ДЖОНСА -- ПЕРЕХОД жидкости-ГАЗ -- СВОЙСТВА ТЕРМОДИНАМИЧЕСКИЕ -- системы магнитные -- ЛЕННАРД-ДЖОНСА СИСТЕМА -- ЖИДКОСТЬ-ГАЗ -- ЖИДКОСТЬ -- ГАЗ

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   P 31

    Pastukhov, V. G.
    Adaptation of loop heat pipes to zero-g conditions / V. G. Pastukhov, Yu. F. Maydanik, Y. G. Fershtater // 6th European Symposium on Space Environmental Control Systems: Noordwijk, Netherlands, 20-22 may 1997 . - 1997. - Vol.400. - С. 385-391

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPES -- HEAT-TRANSPORT -- THERMOCAPILLARY PHENOMENA
Аннотация: Loop heat pipes (LHPs) posses a great variety of valuable properties, which make them quite promising for application both on the Earth and in space. Among these are the LHP high heat-transport capacity at an any orientation in the field of mass forces, good mass-and-size parameters and the possibility of an arbitrary configuration of transport lines. At the same time such a drawback of LHPs of the conventional type as the instability of start up and operation in the region of low heat loads reduces their performance. The problem is connected, in a general case, with the unfavourable distribution of the vapor and the liquid phases of the working fluid in the evaporator. There is reason to believe that the LHP operation can also be significantly affected by zero-g conditions, in which the distribution of a working fluid is pre-determined only by the action of surface forces and the thermocapillary phenomena. The paper performs a general analysis of the necessary conditions imposed on the construction of LHP and some designs that contribute to the retention of serviceability in zero-g conditions at low heat loads. It gives the results of laboratory investigations of an adapted ammonia LHP with a heat-transfer capacity up to 2 kWxm

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   K 79

    Koverda, V. P.
    An origin of 1/f fluctuations at a nonequilibrium phase transition [] / V. P. Koverda, V. N. Skokov // Physica A. - 1999. - V. 262, N 3-4. - С. 376-387

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
1/f-NOISE -- NONEQUILIBRIUM PHASE TRANSITIONS -- HIGH-TEMPERATURE SUPERCONDUCTOR -- BOILING -- STOCHASTIC EQUATIONS -- FILMS
Аннотация: We present the results of experimental study of an intensive source of wide-band 1/f noise whose generation appears in a system of two interacting nonequilibrium phase transitions. Such a process has been realized in the region of superposition of a superconductor-normal conductor phase transition on a liquid-vapor crisis transition in a boiling cooler. A mathematical model describing phase transitions in a dynamical system with two interacting order parameters, converting "white" noise into two stationary stochastic processes with 1/f and 1/f(2) spectra has been suggested. The properties of model oscillations with 1/f spectrum are qualitatively adequate to those observed in experiment. The characteristic difference of model oscillations with a 1/f(2) spectrum from classic random walks has also been noted

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   B 74

    Boltachev, G. Sh.
    Analytical model of a corona discharge from a conical electrode under saturation [Электронный ресурс] / G. Sh. Boltachev, N. M. Zubarev // Technical Physics. - 2012. - Vol.57, №11. - P1493-1502

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CONICAL ELECTRODE -- ANALYTICAL MODEL -- ELECTRIC FIELD
Аннотация: Exact partial solutions are found for the electric field distribution in the outer region of a stationary unipolar corona discharge from an ideal conical needle in the space-charge-limited current mode with allowance for the electric field dependence of the ion mobility. It is assumed that only the very tip of the cone is responsible for the discharge, i. e., that the ionization zone is a point. The solutions are obtained by joining the spherically symmetric potential distribution in the drift space and the self-similar potential distribution in the space-charge-free region. Such solutions are outside the framework of the conventional Deutsch approximation, according to which the space charge insignificantly influences the shape of equipotential surfaces and electric lines of force. The dependence is derived of the corona discharge saturation current on the apex angle of the conical electrode and applied potential difference. A simple analytical model is suggested that describes drift in the point-plane electrode geometry under saturation as a superposition of two exact solutions for the field potential. In terms of this model, the angular distribution of the current density over the massive plane electrode is derived, which agrees well with Warburg's empirical law

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   R 96

    Rutin, S. B.
    Apparatus for studying heat transfer in nanofluids under high-power heating [Electronic resource] / S. B. Rutin, P. V. Skripov // Journal of Engineering Thermophysics. - 2012. - Vol.21, №2. - P144-153. - Bibliogr. : p. 153 (19 ref.)

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HEAT TRAHSFER -- HIGH-POWER HEATING -- ELECTRONIC CONTROL
Аннотация: A technique of electronic control of the probe heating power is developed using the method of controlled pulse heating of a wire probe, that is a resistance thermometer, was developed. An apparatus implementing this technique was fabricated. The characteristic parameters of the apparatus are as follows: the heating pulse length, 1 to 10 ms; the heat flux density through the surface of a 20 µm probe, 1 to 10 MW/m2; repeatability of selected power value in a series of pulses is on a level of 0.05%. As an example, the constant heating power mode is applied for comparing the thermal resistance of nanofluids in the region of stable states of liquid and superheated (with respect to the liquid-vapor equilibrium temperature of the base liquid) ones. The parameter was the content of Al2O3 nanoparticles in the base liquid (isopropanol).

\\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2012, V.31, N 2. P. 144-153.pdf
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10.

11.

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   C 73


    Comparison of thermophysical properties for oil/refrigerant mixtures by use of the pulse heating method / P. V. Skripov, A. A. Starostin, D. V. Volosnikov, V. P. Zhelezny // International Journal of refrigeration. - 2003. - Vol.26, №6. - С. 721-728

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
REFRIGERANT -- LUBRICANT -- MIXTURES
Аннотация: The method of pulse heating for the study of thermophysical properties for oil/refrigerant solutions in a wide temperature range and for monitoring of an actual state of these systems has been developed. The regimes of linear heating and thermostabilization of the superheated probe are applied for solving our task. The objects of study are as follows: synthetic oils Mobil EAL Arctic 22, PLANETELF ACD22, XMPA, and solutions of carbon dioxide in these oils. The upper boundary, with respect to temperature, of the two-phase equilibrium region including the vicinity of the liquid–vapour critical curve of these systems, gas solubility in oils at various temperatures, short-time thermostability, and thermal conductivity of oils are considered. Inclusion of the thermally unstable states of a substance in investigation allows one to essentially extend the set of compared data

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12.

13.

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   S 89

    Vshivkov, S. A.
    Effect of molecular dimensions of components on phase transitions in solutions of oligomeric polyethers / S. A. Vshivkov, M. Z. Faizullin // Polymer Science. Series A. - 2009. - Vol.51, №9. - С. 974-978

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
POLYMER-SOLVENT INTERACTION -- POLYSTYRENE -- REGION
Аннотация: The molecular masses and intrinsic viscosities of a series of oligomeric poly(propylene glycols) have been studied by light scattering, analysis of chain ends, viscometry, and the cloud-point method. Phase diagrams are plotted and the Flory-Huggins thermodynamic interaction parameters and the second virial coefficients are calculated for oligomeric poly(propylene glycol)-n-alkane systems. The effects of the molecular dimensions of components on their mutual solubility and positions of boundary curves are determined. UCST decreases with an increase in the size of poly(propylene glycol) macromolecules and increases with an increase in the size of n-alkane mol

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14.

15.

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   S 68

    Smolyak, B. M.
    Effects of relaxation in levitating superconductors / B. M. Smolyak, G. N. Perelshtein, G. V. Ermakov (Yermakov) // Cryogenics. - 2002. - Vol.42, №10. - С. 635-644

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SUPERCONDUCTORS -- FLUX CREEP -- MAGNETIC LEVITATION
Аннотация: The effect of the magnetic flux creep on the levitation stability of high-temperature superconductors was studied. It was shown experimentally that under a unipolar magnetization the levitation force decreased at a logarithmic velocity characteristic of the creep process. If the current structure was bi- or multi-polar one, which was formed in a sample exposed to a reversing external magnetic field, the force remained unchanged during a certain period of time. The theory of relaxation of magnetization and force for a partial and full penetration of the critical state was considered. It was shown that relaxation decelerated sharply if the region with a current producing the main magnetization was far from the superconductor surface. A concept of an open and internal magnetic relaxation was introduced. The time of the internal relaxation for different reverse depths was estimated. The calculated values approached the experimental values of the levitation stabilization time

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16.

17.

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   G 15

    Galashev, A. E.
    Emissivity of the main greenhouse gases [Electronic resource] / A. E. Galashev, O. R. Rakhmanova // Russian Journal of Physical Chemistry B. - 2013. - Vol.7, №3. - P346-353. - Bibliogr. : p. 353 (18 ref.)

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ABSORPTION AND EMISSION SPECTRA -- GREENHOUSE GASES -- IR ABSORPTION
Аннотация: Based on the high-resolution data on the absorption lines of gases from the HITRAN open inter-national database in conjunction with inverse Fourier transform, the autocorrelation function of the total dipole moment of the molecules of the main greenhouse gases, such as H2O, CO2, O3, N2O, and CH4, are determined. The spectral absorption coefficient and spectral radiance of these gases in the investigated IR region is calculated. An analysis of the emissivity of each of the gases is performed. An efficiency criterion of IR absorption and emission is introduced, according to which the studies gases are ranked

\\\\expert2\\NBO\\Russian Journal of Physical Chemistry B\\2013, v. 7, N 3, p. 346.pdf
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18.

19.

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   E 93


    Evaluation of metastable region boundaries for liquid and solid states in MD simulations [Electronic resource] / G. V. Ionov, V. V. Dremov, A. V. Karavaev, S. P. Protsenko, V. G. Baidakov, A. O. Tipeev // Journal of Physics : Condensed Matter. - 2014. - Vol.500, №17. - Article number 172004. - Bibliogr. : (6 ref)

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DIFFUSION -- DYNAMIC LOADS -- LIQUIDS
Аннотация: An automatic method based on MD simulations was developed for detecting and tracing the boundaries of metastable states of superheated crystal and supercooled liquid. The main criterion of the detection of early nucleation of new phase is the self-diffusion coefficient temperature dependence. The scanning for nucleation events is performed at continuous temperature change. The set of independent nucleation events at a given pressure allows evaluation of temperature dependence of specific nucleation frequency. The collection of a large number of these calculations allows accurate approximation of pressure and temperature dependence of the specific nucleation frequency in both directions between phases. This dependence allows estimating the behavior of the free energy in the region between superheating and supercooling curves. In addition, dependence of nucleation frequency on pressure and temperature provides an opportunity to integrate the probability of nucleation under dynamic loading and subsequent release and thus to determine the likelihood of the crystallization and melting. The technique was applied to tin. MD simulation was carried out with the help of the EAM interatomic potential, well reproducing the properties of BCC phase.

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