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Общее количество найденных документов : 26
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 1-10    11-20   21-26 
1.

Вид документа :
Шифр издания : 53/Y 14
Автор(ы) : Yakoumis I. V., Nikitin E. D., Kontogeorgis G. M.
Заглавие : Validation of a recent generalized expression of Tc/Pc vs. the van der Waals surface area according to recent measurements
Место публикации : Fluid Phase Equilibria. - 1998. - Vol.153, №1. - С. 23-27
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical properties --vapour–liquid equilibria
Аннотация: Recently, Kontogeorgis et al. [G.M. Kontogeorsis, I.V. Yakoumis, P. Coustikos, D.P. Tassios, Fluid Phase Equilibria, 140 (1–2) (1997) 145–146] developed a generalized expression for the ratio of the critical temperature to the critical pressure (Tc/Pc) with the van der Waals surface area (Qw). Despite the extensive database involved in the development of this equation, the heaviest compounds involved were n-tetracosane in terms of Tc/Pc ratio and PEG-400 in terms of highest Tc. The maximum Tc/Pc value was below 100. The correlation is further validated in light of recent critical data appearing in the literature for heavy compounds with Tc/Pc ratio up to 185. The satisfactory agreement between experimental and predicted Tc/Pc ratios justifies its application to high molecular weight compounds other than those employed for its development
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2.

Вид документа :
Шифр издания : 53/Y 14
Автор(ы) : Yakoumis I. V., Nikitin E. D., Kontogeorgis G. M.
Заглавие : Validation of a recent generalized expression of Tc/Pc vs. the van der Waals surface area according to recent measurements
Место публикации : Fluid Phase Equilibria. - 1998. - Vol.153, №1. - С. 23-27
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical properties --vapour–liquid equilibria
Аннотация: Recently, Kontogeorgis et al. [G.M. Kontogeorsis, I.V. Yakoumis, P. Coustikos, D.P. Tassios, Fluid Phase Equilibria, 140 (1–2) (1997) 145–146] developed a generalized expression for the ratio of the critical temperature to the critical pressure (Tc/Pc) with the van der Waals surface area (Qw). Despite the extensive database involved in the development of this equation, the heaviest compounds involved were n-tetracosane in terms of Tc/Pc ratio and PEG-400 in terms of highest Tc. The maximum Tc/Pc value was below 100. The correlation is further validated in light of recent critical data appearing in the literature for heavy compounds with Tc/Pc ratio up to 185. The satisfactory agreement between experimental and predicted Tc/Pc ratios justifies its application to high molecular weight compounds other than those employed for its development
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3.

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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4.

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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5.

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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6.

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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7.

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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8.

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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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/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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