Центральная Научная Библиотека УрО РАН

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   V 70

    Vinogradov, V. E.
    Explosive cavitation in superheated liquid argon [Text] / V. E. Vinogradov, P. A. Pavlov, V. G. Baidakov // Journal of Chemical Physics. - 2008. - Vol. 128, № 23. - P234508/1-234508/6

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ARGON
Аннотация: The kinetics of explosive boiling-up of liquid argon has been investigated at negative pressures created by the reflection of a compression pulse 3–5 µs long from the free surface of a liquid by the method of liquid pulse heating on a thin platinum wire (with a rate of temperature increase of about 1 K/µs). The limiting superheats T* (stretches p*), the effective nucleation rate J*, and the derivative GT=(d ln J/dT)T=T* have been determined by experimental data on the thermal perturbation of a wire probe and the results of solution of the problem on the initial stage of explosive boiling-up of a liquid. The experimental data are compared with homogeneous nucleation theory.

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   B 16

    Baidakov, V. G.
    Superheating of liquid xenon in metal tubes [Electronic resource] / V. G. Baidakov, A. M. Kaverin // Journal of Chemical Physics. - 2009. - Vol.131, №6. - Artical Number 064708

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LINE-TENSION -- SURFACE TENSION -- NUCLEATION
Аннотация: The method of measuring the lifetime has been used to investigate the kinetics of spontaneous boiling-up of superheated xenon in copper tubes. In experiments the temperature dependence of the mean lifetime has been determined at pressures of 1.48 and 1.98 MPa. The data obtained have been compared with homogeneous nucleation theory. It has been found that experimental values of the attainable superheating temperature and the derivative (partial derivative ln J/partial derivative T)(p) are systematically lower than their theoretical values. A description of experimental data in the framework of heterogeneous nucleation theory has shown that for the agreement of theory and experiment with the use of a macroscopic model of nucleation on a smooth surface it is necessary to take the value of the equilibrium contact angle theta(0) equal to 70 degrees, which is not a characteristic for a xenon-metal system. Taking into account the contribution of the energy of the three-phase contact solid wall-liquid-gas in a microscopic nucleation model makes it possible to reconcile heterogeneous nucleation theory and experimental data at a contact angle theta(0) close to zero, with the linear tension taken equal to -6x10(-12) J/m and the microscopic contact angle theta(*)similar or equal to 57 degrees. The number of weakened sites, on which bubbles may form, is always smaller than the number of molecules adjacent to the solid wall

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   V 70

    Vinogradov, V. E.
    Cavitation strength of an argon-helium solution / V. E. Vinogradov, P. A. Pavlov, V. G. Baidakov // Chemical Physics Letters. - 2009. - Vol.474, № 4-6. - С. 294-296

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EXPLOSIVE CAVITATION -- HELIUM-SATURATED LIQUID -- THIN PLATINUM
Аннотация: The kinetics of explosive cavitation has been studied by experiment in helium-saturated liquid argon. Measurements have been made by the method of pulse heating of a solution on a thin platinum wire in a negative-pressure wave. The temperature dependence of cavitation strength has been traced, the effective values of the nucleation rate J and the derivative dlnJ/dT have been determined. It has been found that the dissolution of helium results in decreasing cavitation strength of argon. Satisfactory agreement between data of homogeneous nucleation theory and experiment with the use of capillarity approximation in the latter, though limiting stretches (superheats) attained by experiment are nevertheless systematically lower than calculated ones

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