The theory of the growth of vapor bubbles in a metastable liquid

“…A number of authors take the liquid temperature to be constant: when calculating the materials swelling [1], when determining the thermodynamic characteristics of steam [7] and cavitation bubbles [8]. In [9], the liquid temperature is described by the exponential function that does not depend on time and the direction of the bubble wall's movement.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Peculiarities of Phase Processes in the Volume of Liquid

Pavlenko

Koshlak

2018

SAE

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methods. Mathematical models allow identifying the most powerful factors and optimizing technological processes. Correctness of the mathematical models of gas-to-steam bubbles is determined by the accuracy of accounting all thermal and physical processes taking place in the liquid and gas. Literature review and problem statementTo improve the accuracy of simulating heat transfer processes in the gas-to-steam bubble, it is necessary to consider the heat transfer into the liquid medium. A number of authors take the liquid temperature to be constant: when calculating the materials swelling [1], when determining the thermodynamic characteristics of steam [7] and cavitation bubbles [8]. In [9], the liquid temperature is described by the exponential function that does not depend on time and the direction of the bubble wall's movement. A b s t r a c t The work is devoted to the study of the transient processes of heat and mass transfer in the volume of a liquid. The method of calculating the temperature field in a liquid takes into account phase transitions, motion of the bubble wall and heat exchange processes near its surface. The method takes into account the change in the thermophysical characteristics of a liquid when its temperature changes. The results of the research can be used to optimize the various technological processes associated with cavitation, boiling and the formation of gas hydrates.Keywords: thermophysical characteristics of a gas-saturated liquid, gas-vapor bubble, heat transfer in two-phase media, phase transitions S t r e s z c z e n i e Słowa kluczowe: właściwości termofizyczne cieczy nasyconej gazem, pęcherzyki gazu i pary, wymiana ciepła w mediach dwufazowych, przemiany fazowe

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Foil explosion and decay of metastable state

et al. 2019

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The mechanism of decay of the superheated metastable metal produced by a thin foil explosion was investigated experimentally. The decay of the metastable metal was indicated by the occurrence of bubbles detected using soft x-ray backlighting. The experiments were carried out on a research facility comprising three current generators. One of them was used to initiate the explosion of a test foil, and the other two, X-pinch backlighting sources, were used for diagnostics. In the experiments, an upper limit has been determined for the decay time of the metastable state of a superheated metal. For aluminum, at a foil thickness of 6 μm and a deposited energy of 1.49 ± 0.08 eV/atom, the metastable state decay time was about 90 ns; for copper, at the same foil thickness and a deposited energy of 1.46 ± 0.07 eV/atom, it was about 250 ns. Analysis of the experimental results based on the classical nucleation theory has made it possible to estimate the work required for the formation of a critical bubble, the radius of the critical bubble, and the Tolman length, which characterizes the effect of the surface curvature on the surface tension. The work required for the formation of a critical bubble has been estimated to be 16.6 ± 1.5 eV for aluminum and 18.3 ± 1.2 eV for copper. The critical bubble radius and the Tolman length turned out to be several nanometers for both test metals.

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The theory of the growth of vapor bubbles in a metastable liquid

Cited by 5 publications

References 6 publications

Propagation of small disturbances in the aboiling liquid containing gas nuclei

Propagation of small disturbances in the aboiling liquid containing gas nuclei

Peculiarities of Phase Processes in the Volume of Liquid

Foil explosion and decay of metastable state

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