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传热学
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ISSN 打印: 1064-2285
ISSN 在线: 2162-6561

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传热学

DOI: 10.1615/HeatTransRes.v32.i1-3.70
8 pages

Experimental and Theoretical Investigation of the Process of Initiation of Vapor Explosion on a Solid Semispherical Model. Part 2. Experiment

Vasilii V. Glazkov
Moscow Power Engineering Institute (Technical University), Russia
Vyacheslav G. Zhilin
Incorporated Institute of High Temperatures (IIHI) of the Russian Academy of Science, 13/19 Igorskaya str., Moscow, Russia
Yurii P. Ivochkin
Moscow Power Engineering Institute; and Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow, Russia
V. S. Igumnov
Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
Oleg A. Sinkevich
Science Technological Center of Associated Institute for High Temperature, Russian Academy of Science and Moscow Power Engineering Institute (Technical University), Russia
Vladimir R. Tsoi
Elektrogorsk Research and Engineering Center on Nuclear Plants Safely (ENIT's),Bezymyannaya ul., 6, Elektrogorsk, Moscowoblas t, 142530, Russia
V. G. Shvets
Elektrogorsk Scientific-Research Center, Elektrogorsk, Russia

ABSTRACT

On the basis of the analysis of the experimental data, a physical model of the initiation of a vapor explosion has been developed. The following stages of the process of an explosion-like transition from a film to a bubble boiling on a semi-spherical model immersed in water are calculated: the incipience of the Kelvin-Helmholtz instability of a vapor film; growth of the instability amplitude and the collision of the crests of liquid waves with a surface; extension of the region of collisions due to the propagation of capillary waves generated in recoil; the cooling of the model of the temperature below the critical one and collapse of the vapor film; superheating of the surface layer of liquid that came in contact with the model and the expansion of the formed vapor layer resulting in the generation of a descending liquid jet. The estimates obtained demonstrate the qualitative and quantitative agreement with experimental results.


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