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Общее количество найденных документов : 80
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1.
Инвентарный номер: нет.
   
   F 17


    Faizullin, M. Z.
    Thermodynamic Similarity of Phase-Separation Binary-Solutions with a Lower Critical-Temperature [] / M. Z. Faizullin, V. P. Skripov // Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics. - 1991. - V.173, Pn.1. - С. 53-62
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AQUEOUS SOLUTIONS -- PHASE-SEPARATIONS -- DOUBLE CRITICAL POINT -- THERMODYNAMIC SIMILARITY
Аннотация: The thermodynamic similarity of phase-separating binary aqueous solutions with a lower critical solution temperature is discussed. The values of temperature and pressure at the double critical point are used as scales. An analysis of the experimental material on the phase-separation of aqueous solutions of organic compounds has discovered correlations between dimensionless thermodynamic complexes that make it a solution by the data on phase-separation at atmospheric pressure. The proposed algorithm of calculation is verified by the example of the mixture water/2,6-dimethylpyridine. The calculated and the experimental data for the LCP of this solution demonstrate a satisfactory agreement

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2.
Инвентарный номер: нет.
   
   F 17


    Faizullin, M. Z.
    Thermodynamic Similarity of Phase-Separation Binary-Solutions with a Lower Critical-Temperature [] / M. Z. Faizullin, V. P. Skripov // Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics. - 1991. - V.173, Pn.1. - С. 53-62
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AQUEOUS SOLUTIONS -- PHASE-SEPARATIONS -- DOUBLE CRITICAL POINT -- THERMODYNAMIC SIMILARITY
Аннотация: The thermodynamic similarity of phase-separating binary aqueous solutions with a lower critical solution temperature is discussed. The values of temperature and pressure at the double critical point are used as scales. An analysis of the experimental material on the phase-separation of aqueous solutions of organic compounds has discovered correlations between dimensionless thermodynamic complexes that make it a solution by the data on phase-separation at atmospheric pressure. The proposed algorithm of calculation is verified by the example of the mixture water/2,6-dimethylpyridine. The calculated and the experimental data for the LCP of this solution demonstrate a satisfactory agreement

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3.
Инвентарный номер: нет.
   
   B 93


    Bulanov, N. V.
    A method of explosive effervescence of disperse-phase droplets for analysis of emulsions [] / N. V. Bulanov, V. A. Khmylnin // Industrial Laboratory. - 1994. - V.60, Is.10. - С. 599-602
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EFFERVESCENCE EXPLOSIVE -- DISPERSE-PHASE DROPLETS -- EMULSIONS
Аннотация: A method and an experimental setup for dispersion analysis of emulsions based on overheating and explosive effervescence of disperse-phase droplets are described. Formulas are derived and a procedure for determining the fitting parameters for a description of the dispersive composition of an emulsion is given. The maximum count rate was about 500 droplets per second for droplet diameters ranging from 5 to 200 mu m. The method can be automated to handle high-viscosity, opaque, unstable, and heavily contaminated emulsions

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4.
Инвентарный номер: нет.
   
   B 93


    Bulanov, N. V.
    A method of explosive effervescence of disperse-phase droplets for analysis of emulsions [] / N. V. Bulanov, V. A. Khmylnin // Industrial Laboratory. - 1994. - V.60, Is.10. - С. 599-602
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EFFERVESCENCE EXPLOSIVE -- DISPERSE-PHASE DROPLETS -- EMULSIONS
Аннотация: A method and an experimental setup for dispersion analysis of emulsions based on overheating and explosive effervescence of disperse-phase droplets are described. Formulas are derived and a procedure for determining the fitting parameters for a description of the dispersive composition of an emulsion is given. The maximum count rate was about 500 droplets per second for droplet diameters ranging from 5 to 200 mu m. The method can be automated to handle high-viscosity, opaque, unstable, and heavily contaminated emulsions

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5.
Инвентарный номер: нет.
   
   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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6.
Инвентарный номер: нет.
   
   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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7.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Comparison of Different Approaches to the Determination of the Work of Critical Cluster Formation / V. G. Baidakov, G. Sh. Boltachev, J. W. P. Schmelzer // Journal of Colloid and Interface Sience. - 2000. - Vol. 231, № 2. - С. 312-321
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL CLUSTER -- GIBBS' METHOD -- NUCLEATION RATES
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, the van der Waals-Cahn and Hilliard, and a newly developed modified Gibbs' approach—is given. As a model system for comparison, regular solutions are chosen. In addition to the work of critical cluster formation, the composition of the critical clusters, 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 found, in particular, that, for regular solutions, Tolman's equation cannot serve as a first approximation for the description of the curvature dependence of the surface tension even for large cluster sizes and an alternative formula is developed. It is shown that the latter two mentioned methods of determination of the work of critical cluster formation (the van der Waals-Cahn and Hilliard and the modified Gibbs' approach) lead—at least for the model system considered—to 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. The possible origin of such deviations is discussed and some further directions of analysis are anticipated

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8.
Инвентарный номер: нет.
   
   B 16


    Baidakov, V. G.
    Comparison of Different Approaches to the Determination of the Work of Critical Cluster Formation / V. G. Baidakov, G. Sh. Boltachev, J. W. P. Schmelzer // Journal of Colloid and Interface Sience. - 2000. - Vol. 231, № 2. - С. 312-321
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL CLUSTER -- GIBBS' METHOD -- NUCLEATION RATES
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, the van der Waals-Cahn and Hilliard, and a newly developed modified Gibbs' approach—is given. As a model system for comparison, regular solutions are chosen. In addition to the work of critical cluster formation, the composition of the critical clusters, 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 found, in particular, that, for regular solutions, Tolman's equation cannot serve as a first approximation for the description of the curvature dependence of the surface tension even for large cluster sizes and an alternative formula is developed. It is shown that the latter two mentioned methods of determination of the work of critical cluster formation (the van der Waals-Cahn and Hilliard and the modified Gibbs' approach) lead—at least for the model system considered—to 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. The possible origin of such deviations is discussed and some further directions of analysis are anticipated

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9.
Инвентарный номер: нет.
   
   S 34


    Schmelzer, J. W. P.
    Kinetics of Condensation and Boiling: Comparison of Different Approaches / J. W. P. Schmelzer, V. G. Baidakov // Journal of Physical Chemistry B. - 2001. - Vol.105, №47. - С. 11595-11604
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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.
Инвентарный номер: нет.
   
   M 19


    Maydanik, Yu. F.
    Development and Tests of Miniature Loop Heat Pipe with a Flat Evaporator / Yu. F. Maydanik, S. V. Vershinin, M. A. Chenysheva // SAE 2000 Transaction - Journal of Aerospace. - 2001. - Paper Number: 2000-01-2491
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AMMONIA MINIATURE -- LOOP HEAT PIPE -- FLAT EVAPORATOR
Аннотация: The paper presents the results of analysis, development and tests of an ammonia miniature loop heat pipe (MLHP) with a flat evaporator, which has an active-zone diameter of 30mm. The length and the diameter of the vapor and the liquid lines are 1m and 2/1.2mm. The device serviceability has been demonstrated at a horizontal and a vertical orientation in 1-g conditions. The maximum heat load achieved on trials was equal, respectively, to 160W and 120W, which corresponds to a heat flow in the evaporation zone of 23 W/cm 2 and 17 W/cm 2 . The minimum thermal resistance at nominal heat loads from 40 to 80 W varied in the range from 0.42 W/m 2 K to 0.59 W/m 2 K. A comparison has been made with a model MLHP with a cylindrical evaporator equipped with a copper and aluminum “sa

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