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Общее количество найденных документов : 86
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1.

Вид документа :
Шифр издания : 53/I-70
Автор(ы) : Zhang H. X., Lin G. P., Ding T., Maydanik Yu. F., Sudakov R. G.
Заглавие : Investigation of startup behaviors of a loop-heat pipe
Место публикации : Journal of Termophysics and Heat Transfer. - 2005. - Vol. 19, № 4. - С. 509-518
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): heat pipes--vapor/liquid distribution--vapor grooves
Аннотация: The results of ground experiments on startup behaviors of a loop heat pipe are presented. One objective is to investigate the effects of working conditions on the startup of loop heat pipes. Startup behaviors as functions of various parameters, including the vapor/liquid distribution-in the evaporator, startup heat load, sink temperature, and adverse elevation are described and explained. The physical process of startup is described, and the explanation that pressure transfer leads to the saturated temperature rise in the compensation chamber during startup is discussed. The other objective is to investigate the effect of startup on the steady-state operation of loop heat pipes. Test results indicate that evaporation inside the wick tends to occur at low startup heat loads when the evaporator, including the vapor grooves and the evaporator core, is flooded with liquid. Some peculiar phenomena, including evaporation inside the wick, temperature oscillation at the condenser inlet, and reverse flow equilibrium, which lead to higher operating temperatures, were observed during startups
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2.

Вид документа :
Шифр издания : 53/E 97
Автор(ы) : Zhang H. X., Lin G. P., Ding T., Sudakov R. G., Maydanik Yu. F.
Заглавие : Experimental study on start-up characteristics of loop heat pipes
Место публикации : Scienein China Series E-Engineering & Materials Science. - 2005. - Vol. 48, № 2. - С. 131-144
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): loop heat pipe--start-up--experiment
Аннотация: This paper presents results of ground-experimental study on the start-up characteristics of a Loop Heat Pipe. The physical process of start-up is described, and the explanation that "Pressure Transfer" leads to the saturated temperature rise in compensation chamber during start-up is first discussed. Start-up behaviors as a function of various parameters including vapor/liquid distribution in the evaporator, adverse elevation, start-up heat load, sink temperature are described and explained. A peculiar start-up phenomenon composed of two start-up scenarios was first observed at adverse elevations and is described
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3.

Вид документа : Статья из журнала
Шифр издания : 53/S 66
Автор(ы) : Skokov V. N., Koverda V. P., Reshetnikov A. V.
Заглавие : Self-organization of a critical state and 1/f(alpha)-fluctuations at film boiling
Место публикации : Physics Letters A. - 1999. - V. 263, N 4-6. - С. 430-433
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nonequilibrium phase transitions--1/f-noise
Аннотация: 1/f and 1/f(2)-fluctuations have been first revealed by experiment at film boiling on a vertically oriented platinum heater. Fluctuations of 1/f(alpha)-spectrum have been observed over both a wide range of governing parameters and a band of five decimal orders. The experimental results testify to a possible self-organized critical behaviors of a dynamical system at nonequilibrium phase transitions
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4.

Вид документа : Статья из журнала
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N.
Заглавие : An origin of 1/f fluctuations at a nonequilibrium phase transition
Место публикации : Physica A. - 1999. - V. 262, N 3-4. - С. 376-387
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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5.

Вид документа : Статья из журнала
Шифр издания : 53/S 66
Автор(ы) : Skokov V. N., Koverda V. P., Reshetnikov A. V.
Заглавие : Fluctuations with a 1/f(alpha) spectrum in film boiling
Место публикации : Jetp Letters. - 1999. - V. 69, N 8. - С. 636-639
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nonequilibrium phase transitions--1/f-noise
Аннотация: 1/f and 1/f(2) noise were observed experimentally in film boiling of water on vertically oriented platinum heater. Fluctuations with a 1/f(alpha) spectrum were observed in a wide range of controlling parameters and seen over five orders of magnitude in frequency. It was noted that the process investigated is similar to the phenomenon of self-organized criticality
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Andbaeva V. N.
Заглавие : The liquid-gas interface of oxygen-nitrogen solutions 2: Description in the Framework of the van der Waals gradient theory
Место публикации : Fluid Phase Equilibria. - 2009. - Vol.286, №2. - С. 175-181
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): surface tension--gradient theory--density profile
Аннотация: The van der Waals gradient theory (vdW GT) is used to calculate surface tension, density profiles, adsorption, the Tolman length and to determine the position of dividing surfaces in the liquid-gas interface of an oxygen-nitrogen solution. The Helmholtz energy density (HED) is determined via an equation of state (EOS), unified for a liquid and gas, which describes stable. metastable and two-phase states of solutions. The influence parameters are calculated from data on the surface tension of pure components with the use of the mixing rule. At temperatures T 100 K the vdW GT describes experimental data on the surface tension of oxygen-nitrogen solutions [V.G. Baidakov, A.M. Kaverin, V.N. Andbaeva, The liquid-gas interface of oxygen-nitrogen solutions: 1. Surface tension, Fluid Phase Equilib. 270 (2008) 116-120] within the experimental error. It is shown that the Tolman length, which determines the dependence of surface tension on the curvature of the dividing surface, depends considerably on the solution concentration
\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2008, v.286, p.175-181.pdf
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7.

Вид документа :
Шифр издания : 53/S 89
Автор(ы) : Vshivkov S. A., Faizullin M. Z.
Заглавие : Effect of molecular dimensions of components on phase transitions in solutions of oligomeric polyethers
Место публикации : Polymer Science. Series A. - 2009. - Vol.51, №9. - С. 974-978
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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8.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Protsenko S.P., Tipeev O. A.
Заглавие : Metastable extension of the melting line and the critical endpoint
Место публикации : Journal of Non-Crystalline Solids : 9th International Symposium on Crystallization in Glasses and Liquids Location, Foz do Iguacu, BRAZIL, 10-13 sep. , 2009 . - 2009. - Vol.356, №52-54. - С. 2923-2927
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): molecular-dynamics simulation--lennard-jones system--negative pressures
Аннотация: Molecular-dynamics methods have been employed to calculate the (p, rho, T)-properties and the internal energy of the Lennard-Jones crystal and liquid phases in both stable and metastable states to the boundaries of limiting supersaturations. Thermal and caloric equations of state have been formulated for determining the parameters of phase equilibrium and approximating the boundaries of essential instability (the spinodal curves). The results of calculations of phase equilibrium parameters from the condition of chemical potentials equality show that the melting line in the region of its metastable extension approaches the spinodal of a stretched liquid. The point of contact (the critical endpoint) is characterized by the following parameter values: T*(m)= 0.5286, p*(m) = -1.7128, rho*(m,l) = 0.7374, rho*(m,c) = 0.9423. The melting line and its metastable extension were also calculated by simulations of two-phase liquid-crystal systems. A comparison of these two approaches has been performed. (C) 2010 Elsevier B.V. All rights reserved
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9.

Вид документа :
Шифр издания : 53/P 31
Автор(ы) : Pastukhov V. G., Maydanik Yu. F., Fershtater Y. G.
Заглавие : Adaptation of loop heat pipes to zero-g conditions
Место публикации : 6th European Symposium on Space Environmental Control Systems: Noordwijk, Netherlands, 20-22 may 1997 . - 1997. - Vol.400. - С. 385-391
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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10.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Protsenko S.P., Kozlova Z. R.
Заглавие : The self-diffusion coefficient in stable and metastable states of the Lennard-Jones fluid
Место публикации : Fluid Phase Equilibria. - 2011. - Vol. 305, № 2. - С. 106-113
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): lennard-jones fluid--vapor--superheated liquids
Аннотация: Molecular-dynamics simulations have been employed to calculate the self-diffusion coefficient of a Lennard-Jones fluid for 198 sets of state parameters in the range of temperatures 0.35
\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2011, v.305, p. 106-113.pdf
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