Evaluation of the dynamical characteristics of fluid flow caused by collapse of a non-spherical near-surface bubble

Le T, C.; Melikhov, V.I.; Melikhov, O.I.; Yakush, S.E.

Авторы: Le T C., Melikhov V.I., Melikhov O.I., Yakush S.E.
Журнал: Journal of Physics: Conference Series
Том: 1683
Год издания: 2020
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 1
Последняя страница: 9
Номер статьи: 022070
DOI: 10.1088/1742-6596/1683/2/022070
Аннотация: The paper is devoted to numerical study of the influence of the initial shape of avapor bubble on the surface impact of the water jet emerging due to the bubble collapse. Thisproblem is relevant to spreading of high-temperature melt under a layer of subcooled water.The vapor bubbles formed on the melt-water interface, upon complete penetration in water, arecondensing rapidly to produce high-velocity water micro-jets directed towards the melt. Impactof these jets causes upward melt splashing. Superposition of these processes forms a dynamiclayer where melt is mixed with water; the presence of this premixed layer can be a pre-requisitefor steam explosion. In this work, numerical modelling by the boundary element method isperformed for the collapse of a bubble of an oblate spheroid. It is shown that the water jetsgenerated in this process possess the impulse comparable to that generated by a collapsingspherical vapour bubble of the same volume. By the numerical simulations and subsequentestimates it is obtained that collapse of non-spherical bubbles near the melt-water interfaceproduces melt splashes of the height of few centimetres, which is sufficient for the occurrence of steam explosions.
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