2015 1(16)

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Lezhnin S.I., Pribaturin N.A.

Institute of Thermophysics SB RAS, Novosibirsk, Russia


Lezhnin, S.I. and Pribaturin, N.A., (2015) Generation and evolution of pressure waves during phase transitions, Modern Science: Researches, Ideas, Results, Technologies, Iss. #1(16), PP. 222 - 226.


explosive boiling; interface condensation; decompression; waves of compression and rarefaction


The general and specific regularities of the generation of pressure waves at the "liquid - vapor" interface in various physical situations have been considered. The process of formation and propagation of the depression wave at spontaneous contact оf cold liquid and saturated vapor is investigated in a gas dynamics approach. The influence of intensification of heat-transfer processes on the pressure pulse form is investigated. Results of the investigation are in good agreement with results of modeling based on numerical solving the Boltzmann kinetic equation. Based on the original piston model of liquid detachment off the vaporization surface simple analytic and numerical approximations for inertia-controlled growth of vapor bubbles ensemble on a flat heated surface at different conditions were obtained. The laws for bubbles growth and near-wall fluid pressure have been obtained. Based on the model with nonequilibrium phase transformations we have performed a numerical study of the formation process and the evolution of the pressure wave in the atmosphere, caused by mechanical rupture of the pipeline with hot coolant. It is shown that the amplitudes and the wave profiles at different times and types of rupture are essentially differing.


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