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1.

Вид документа : Статья из журнала
Шифр издания : 53/S 71
Автор(ы) : Maydanik Yu. F., Fershtater Y. G., Vershinin S. V., Pastukhov V. G., Goncharov K.
Заглавие : Some results of loop heat pipes development, tests and application in engineering
Место публикации : Proceedings of 5th International Heat Pipe Symposium (Melbourne, Australia, Nov. 17-20, 1996). - Melbourne, 1996. - С. 406-412
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): труба контурная--контурная труба--труба тепловая--тепловая труба
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2.

Вид документа : Статья из журнала
Шифр издания : 53/S 34
Автор(ы) : Schmelzer J. W. P., Boltachev G. Sh., Baidakov V. G.
Заглавие : Classical and generalized Gibbs' approaches and the work of critical cluster formation in nucleation theory
Место публикации : Journal of Chemical Physics. - 2006. - Vol. 124, № 19. - С. 194503/1-194503/18
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): clusters
Аннотация: In the theoretical interpretation of the kinetics of first-order phase transitions, thermodynamic concepts developed long ago by Gibbs are widely employed giving some basic qualitative insights into these processes. However, from a quantitative point of view, the results of such analysis, based on the classical Gibbs approach and involving in addition the capillarity approximation, are often not satisfactory. Some progress can be reached here by the van der Waals and more advanced density functional methods of description of thermodynamically heterogeneous systems having, however, its limitations in application to the interpretation of experimental data as well. Moreover, both mentioned theories—Gibbs’ and density functional approaches—lead to partly contradicting each other’s results. As shown in preceding papers, by generalizing Gibbs’ approach, existing deficiencies and internal contradictions of these two well-established theories can be removed and a new generally applicable tool for the interpretation of phase formation processes can be developed. In the present analysis, a comparative analysis of the basic assumptions and predictions of the classical and the generalized Gibbs approaches is given. It is shown, in particular, that—interpreted in terms of the generalized Gibbs approach—the critical cluster as determined via the classical Gibbs approach corresponds not to a saddle but to a ridge point of the appropriate thermodynamic potential hypersurface. By this reason, the classical Gibbs approach (involving the classical capillarity approximation) overestimates as a rule the work of critical cluster formation in nucleation theory and, in general, considerably.
\\\\Expert2\\NBO\\Journal of Chemical Physics\\2006, v.124, p.194503.pdf
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3.

Вид документа : Статья из журнала
Шифр издания : 53/B 29
Автор(ы) : Bashkatov N.V., Bebenina T.A., Ermakov G.V.
Заглавие : Application of the Theory of Thermodynamic Similarity to Construction of the Equation of State for an Overheated Liquid
Место публикации : Zhurnal Fizicheskoi Khimii. - 1982. - V.56, Is.8. - С. 2071-2074
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): theory of thermodynamic similarity--similarity thermodynamic--equation of state--liquid overheated
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4.

Вид документа : Статья из журнала
Шифр издания : 53/G 15
Автор(ы) : Galashev A. E., Chukanov V. N., Pozharskaya G.I.
Заглавие : Application of Molecular Dynamic Simulation of Water Clusters with CO and CO2 Molecules to Binary Nucleation Problems
Место публикации : Journal of Structural Chemistry. - 2002. - Vol. 43, № 3. - С. 449-457: рис.
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): global cluster geometry optimization --thermodynamic properties --clusters
\\\\Expert2\\NBO\\Journal of Structural Chemistry\\2002, V. 43, N 3, p.449.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 53/D 67
Автор(ы) : Dmitrin V. I., Maydanik Yu. F., Pastukhov V. G.
Заглавие : Development and investigation of compact cooler using a pulsating heat pipe
Место публикации : High Temperature. - 2010. - Vol. 48, № 4. - С. 565-571
Примечания : Bibliogr. : с. 571 (16 ref)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): heat pipe-- water--methanol
Аннотация: Results are given of development and investigations of a compact cooler for application in electronics, based on an open-loop oscillating heat pipe. The cooler operation is investigated, where water, methanol, and R141b Freon are used as working fluids under conditions of uniform and concentrated heat input. The effective operation of the device is demonstrated in the heat load range from 5 to 250 W. The “heat source-ambient air” minimal thermal resistance of 0.35°C/W was reached with water under uniform heat load of 250 W. The maximal value of heat load density is 75 W/cm2 with the heat flux concentration on the surface of 1 cm2, where methanol is used as working fluid
\\\\Expert2\\NBO\\High Temperature\\2010, v. 48, N 4, p.565.pdf
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6.

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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7.

Вид документа :
Шифр издания : 53/B 74
Автор(ы) : Boltachev G. Sh., Baidakov V. G.
Заглавие : Mechanical approach to the description of liquid–vapor interfaces at low temperatures
Место публикации : Chemical Physics Letters. - 2004. - Vol.394, №4-6. - С. 329-333
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): low temperatures--lennard-jones--tolman length
Аннотация: The prospects of application of a mechanical model in describing the properties of planar and curved interfaces at low temperatures are investigated. It is shown that, in the framework of such approach, the Tolman length determining the first-order curvature correction to the surface tension, γ, is equal to zero. In the range of small values of the radius of curvature, R, the mechanical approach overestimates considerably the value of γ. For the Lennard-Jones potential the non-analyticity in the dependence γ(1/R) is found at 1/R = 0. It disappears for potentials decreasing more rapidly with the distance between the particles
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8.

Вид документа :
Шифр издания : 53/S 34
Автор(ы) : Schmelzer J. W. P., Baidakov V. G., Boltachev G. Sh.
Заглавие : Kinetics of boiling in binary liquid–gas solutions: Comparison of different approaches
Место публикации : Journal of Chemical Physics. - 2003. - Vol.119, №12. - С. 6166-6183
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical cluster --gibbs' method--van-der-waals
Аннотация: A comparative analysis of the results of determination of the work of critical cluster formation in nucleation theory for three different methods of evaluation—Gibbs’ method (employing the capillarity approximation), the van der Waals–Cahn and Hilliard and a newly developed modified Gibbs’ approach—is given in application to phase formation in multicomponent systems. As an example, processes of boiling in binary liquid–gas solutions, in particular, in nitrogen–helium mixtures are investigated. In addition to the work of critical cluster formation, the bulk properties of the critical bubbles, their characteristic sizes and the values of the surface tension are determined in dependence on the initial supersaturation in the system or, equivalently, on the size of the critical clusters. It is shown that latter two mentioned methods (the van der Waals–Cahn and Hilliard and the modified Gibbs’ approach) lead, in the determination of the work of critical cluster formation, to qualitatively and widely even quantitatively equivalent results. As one of the more general consequences from the present analysis, it has been proven that the modified Gibbs’ approach represents a highly effective tool for the determination of the work of formation of clusters or bubbles of critical sizes not only for one-component and quasibinary systems, discussed earlier, but for phase formation in multicomponent systems of, in general, arbitrary numbers of components as well. It is shown that the modified Gibbs’ approach is preferable as compared with Gibbs’ original treatment not only due to its advantages with respect to an appropriate determination of the properties of clusters of critical sizes, but also from general theoretical considerations. In the limit of large sizes of the critical clusters, both approaches—Gibbs’ original treatment and the modified or generalized Gibbs’ approach—lead to equivalent results
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9.

Вид документа :
Шифр издания : 53/S 34
Автор(ы) : Schmelzer J. W. P., Baidakov V. G.
Заглавие : Kinetics of Condensation and Boiling: Comparison of Different Approaches
Место публикации : Journal of Physical Chemistry B. - 2001. - Vol.105, №47. - С. 11595-11604
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical cluster --gibbs' method--van-der-waals method --hilliard method
Аннотация: A comparative analysis of the results of determination of the work of critical cluster formation in nucleation theory for three different methods of evaluationGibbs' method (employing the capillarity approximation), the van der Waals−Cahn and Hilliard method, and a newly developed modified Gibbs approachis given. As a particular application, the processes of condensation and boiling in one-component fluids are analyzed. As a model system for comparison, van der Waals fluids are chosen. In addition to the work of critical cluster formation, the bulk properties of the critical clusters (drops or bubbles), their characteristic sizes, and the values of the surface tension are determined in dependence on the initial supersaturation in the system or, equivalently, on the size of the critical clusters. It is shown that latter two mentioned methods of determination of the work of critical cluster formation (the van der Waals−Cahn & Hilliard and the modified Gibbs approach) leadat least for the model system consideredto qualitatively and partly quantitatively equivalent results. Nevertheless, differences remain which may lead to quantitative deviations when applied to the determination of the steady-state nucleation rates and further basic characteristics of nucleation-growth processes. The possible origin of such deviations is discussed, and some further directions of analysis are anticipated
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10.

Вид документа :
Шифр издания : 53/M 19
Автор(ы) : Maydanik Yu. F.
Заглавие : Loop heat pipes
Место публикации : Applied Thermal Engineering. - 2005. - Vol.25, №5-6. - С. 635-657
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): heat-transfer device--loop heat pipes --cooling
Аннотация: Loop heat pipes (LHPs) are two-phase heat-transfer devices with capillary pumping of a working fluid. They possess all the main advantages of conventional heat pipes, but owing to the original design and special properties of the capillary structure are capable of transferring heat efficiency for distances up to several meters at any orientation in the gravity field, or to several tens of meters in a horizontal position. Besides, the LHP conception allows a wide variety of different design embodiments, which essentially extends the sphere of functional possibilities and practical application of these devices. The paper is a review of developments, results of theoretical analysis and tests of LHPs performed at the Institute of Thermal Physics and some other organizations. It gives examples of successful application of these highly efficient devices in space technology and electronics
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