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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/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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6.

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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7.

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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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 : 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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10.

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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