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1.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kaverin A. M.
Заглавие : Attainable Superheating of Liquid Helium–Oxygen Solutions
Место публикации : High Temperature. - 2000. - Vol.38, №6. - С. 852-859
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): nucleation--theory of homogeneous nucleation--boiling
Аннотация: The results are given of experimental investigations of the kinetics of nucleation in gas-saturated helium-oxygen solutions. The temperature dependences of the mean lifetime of solution in the metastable (superheated) state are determined for fixed values of pressure of 1.171 and 1.667 MPa and for several values of concentration. The experimental data are compared with the theory of homogeneous nucleation in a macroscopic approximation with due regard for the dependence of the properties of the nuclei on their size. The dimensional effect is included within van der Waals' gradient expansion. The problems associated with the construction of the kinetic theory of boiling of gas-saturated solutions are discussed, and good agreement is ascertained between the experimental data and the theory of nucleation when the latter includes the dimensional effect
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2.

Вид документа :
Шифр издания : 53/P 36
Автор(ы) : Pavlenko A. N., Koverda V. P., Reshetnikov A. V., Mazheiko N. A., Surtaev A. S., Zhukov V. E.
Заглавие : Peculiarities of superheated liquid discharging under strong and weak nonequilibrium conditions
Место публикации : Journal of Engineering Thermophysics. - 2010. - Vol.19, №4. - С. 289-305
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superheated liquids--nonequilibrium conditions --high-pressure chamber
Аннотация: Results obtained in experimental investigating the characteristics of superheated liquid jet discharging under different nonequilibrium conditions are presented. The cases of liquid discharge from a high-pressure chamber and under gravitational jet formation conditions are considered. Different mechanisms of liquid flash boiling with heating growing up to limit superheating are identified in the case of liquid discharging from the high-pressure chamber. Dependences of the reactive force and the jet shape on the value of liquid overheating in a flow are presented. It is shown that the rapidly decreasing value of the reactive force of the jet is connected with its complete disintegration caused by homogeneous nucleation and by the presence of a normal wall behind the outlet from the channel. The parameters of two-phase jet stability in the conditions of gravitational falling, the flow rates, and the size of droplet dispersion zones depend substantially on the shape of holes and the heat flux density. Pronounced effects of partial or full blocking of the holes as a result of soluble impurities deposition in the regimes of cryogenic liquid evaporation or boiling when vapor cavities are formed in the channel are observed in the conditions of long-term discharging under nonadiabatic conditions. This leads to complete disintegration of the jet and uncontrollable reduction of the flow rate through the hole up to full blocking of the latter
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3.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : Experimental investigations of superheated and supercooled water (review of papers of the school of the academician V. P. Skripov)
Место публикации : NATO Science for Peace and Security Series A: Chemistry and Biology. - 2010. - С. 253-270
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): sound velocity--heavy water--superheating
Аннотация: The review presents the results of experimental investigations of nucleation in superheated light and heavy water in the range of nucleation rates from 104 to 1029 s−1m−3. A study is performed of the kinetics of crystallization of droplets of superheated water and amorphous water layers. Measurements have been made of the density, sound velocity, dielectric constant of light and heavy water in the vicinity of the phase equilibrium line with deep entry into the region of metastable (superheated) states. The local and integral characteristics of streams of boiling-up water flowing out into the atmosphere through a short channel have been investigated. One can see the determining role of a vapor phase in such a process at a temperature above 0.9T c , where T c is the temper-temperature at the critical point
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4.

Вид документа :
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : Attainable superheating of solutions of cryogenic liquids
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 109-118
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling-up--cryogenic liquids --kramers-zeldovich method
Аннотация: The kinetics of spontaneous boiling-up of superheated binary solutions of cryogenic liquids is studied. Within the framework of the Kramers-Zeldovich method, an expression is obtained for the steady state rate of homogeneous nucleation in a solution that takes into account free-molecular and diffusion regimes of the substance supply to a growing bubble. Viscous and inertial forces are also taken into account in the study of the nucleus growth dynamics. The work of critical nucleus formation is determined within the framework of the Gibbs and van der Waals capillarity theories. The dependence of the surface tension of critical bubbles in the solution on their size is investigated. The temperature of attainable superheating and nucleation rates in superheated solutions of cryogenic liquids with complete or partial solubility of the components are determined by a method of lifetime measurement. The experiments were conducted in a wide range of pressures and solution concentrations. The measurement results are compared with the theory of homogeneous nucleation taking or not taking into account the size effect in nucleation. It has been found that, by taking into account the size dependence of the surface tension of a nucleus, better agreement between the theory and experiment is obtained. The boundary of essential instability of the solution, that is, the diffusion spinodal, is computed
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5.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kaverin A. M., Pankov A. S.
Заглавие : Nucleation in Liquid Ethane with Small Additions of Metha
Место публикации : Journal of Physical Chemistry C. - 2012. - Vol.116, №38. - С. 20458-20464
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): liquid--spontaneous boiling-up--ethane–methane solutions
Аннотация: The method of measuring the lifetime of a liquid in a metastable (superheated) state has been used to investigate the kinetics of spontaneous boiling-up of ethane–methane solutions. The temperature dependence of the solution mean lifetime has been traced at two values of methane concentration (2.1 and 6.0 mol %) and two pressures (1.0 and 1.6 MPa). The results of experiments are compared with classical homogeneous nucleation theory. For pure ethane at small (8.9 s) lifetimes, one can observe a systematic “under-heating” (0.5–0.7 K) of the solution against theoretical values of the limiting superheating temperature. Dissolution of 6 mol % of methane in ethane results in a solution “superheating” of 0.7 K in excess of the theoretical value. The slopes of experimental curves at small (8.9 s) lifetimes are in satisfactory agreement with theory. When the mean lifetimes exceed the value of 8.9 s, one can observe considerable deviations of experimental curves from theoretical lines. The discrepancies are discussed in the context of models of heterogeneous and initiated nuc
\\\\Expert2\\nbo\\Journal of Physical Chemistry C\\2012, v. 116, p.20458.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G.
Заглавие : Attainable superheating of liquefied gases and their solutions : review
Место публикации : Fizika Nizkikh Temperatur. - 2013. - Vol.39, №8. - С. 835-862
Примечания : Bibliogr. : p. 861-862 (87 ref)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): cavitation--cryogenic liquids --meta-stable state
Аннотация: The review is mainly concerned with the kinetics of spontaneous boiling-up of liquefied gases and their solutions. It examines the theories of thermofluctuation and quantum nucleation in metastable liquids. The methods of experimental investigation of nucleation kinetics are given. The experimental data on temperature of attainable superheating of cryogenic liquids and solutions of liquefied gases are presented for a wide range of pressures, including negative ones. The properties of new-phase nuclei near the attainable super-heating boundary are discussed. The kinetics of initiated and heterogeneous nucleation is considered. The experimental data on detection of quantum tunneling of nuclei are given. Experimental data are compared with the theories of thermofluctuation and quantum nucleation
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7.

Вид документа :
Шифр издания : 53/P 34
Автор(ы) : Pavlov P. A.
Заглавие : Thermodynamic crisis of boiling
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 145-154
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): vapor-- loop heat pipe
Аннотация: The procedure of calculation of the dynamics of rapid near-wall vaporization near a metallic heater is considered. A physical model of explosive boiling-up on bubbles of fluctuation origin is used. The model is limited to regimes when the motion of bubbles can be ignored and convective flows do not have enough time to develop. It is assumed that the dry spot under a bubble thermally insulates the heater wall. The heat removal is provided by the vicinity of the wetting line (WL). An analytical calculation has become possible on the basis of the well-known exact solution to the problem of the temperature field near the wetting line. Generalization of this solution has led to two new problems. These are the problem of allowance for the difference of the dynamic wetting angle from the right angle and that of allowance for thermocapillary flows. A numerical comparison of the results of calculation of the dry area with the use of different methods of allowing for the “tightness” effect in the dynamics of bubble generation and growth has been made. The evolution of bubbles from their generation to growth limited by the heat supply has been investigated. It has been found that the transition stage in the development of bubbles from Rayleigh to thermal ones is of considerable importance in the processes of explosive boiling-up. The dynamics of change in the dry area and wetting line length prior to the stage of bubble merging into a vapor film has been calculated. A condition of passage of the heat flux through a maximum is found. The applicability of the idea of thermodynamic crisis to calculations of miniature devices is justified. The problem of constructing a model to calculate the interphase surface shape near the wetting line under a developed thermocapillary flow and considerable reactive forces of the vapor flow is formulated. The model is in good agreement with the results of experiments on pulsed superheating of liquids at a rate higher than 1 K/μs
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8.

Вид документа :
Шифр издания : 53/A 10
Автор(ы) : Skripov P. V., Smotritskiy A. A., Starostin A.A., Shishkin A. V.
Заглавие : A method of controlled pulse heating: Applications
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 155-163
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): thermophysical properties --thermal stabilization --high-molecular fluids
Аннотация: This paper is devoted to the state-of-the-art and technical potentials of the pulse heating method for the thin wire probe created in the Ural thermophysical school for studying the kinetics of spontaneous boiling and the related phenomenon of liquid attainable superheating. Special attention is paid to the search for technical means for controlling the power of the probe heating in a pulse experiment with the thermophysical properties of the substance taken into account. Applications of three particular cases are considered: techniques for the constant heating power, the thermal stabilization of the pulse-heated probe, and cooling of the shock-heated probe for investigating the behavior of multicomponent and high-molecular fluids essentially superheated above the temperature of phase equilibrium and/or temperature of molecule thermodestruction in a quasi-static process. Opportunities for application of the method are presented, in particular, for fast detection of volatile admixtures (including their traces) in high-molecular fluids, e.g., in oils of power equipment
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9.

Вид документа : Статья из журнала
Шифр издания : 53/S 66
Автор(ы) : Skripov V. P.
Заглавие : Attainable Superheating and Explosive Boiling-Up of Liquids
Место публикации : Hemisphere Publishing Corporation: International seminar on turbulent natural convention (Dubrovnik, Yugoslavia, 30 Aug. - 4 Sept. 1976). - Dubrovnik, 1976. - С. 601-614
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): семинары--доклады--перегрев жидкостей--жидкости (теплофизика)--кипение взрывное--взрывное кипение--перегрев достижимый--достижимый перегрев--теплофизика
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10.

Вид документа : Статья из журнала
Шифр издания : 53/G 95
Автор(ы) : Gurashkin A. L, Perminov S. A., Ermakov G. V.
Заглавие : Experimental study of the kinetics of boiling and superheating boundary of n-hexane in rigid powder structures
Место публикации : Teplofizika i Aeromekhanika. - 2006. - Vol. 13, № 4. - С. 641-650
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): n-hexane
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