Dynamics of a Gas Bubble near a Wall under Acoustic Excitation with the Formation of Cumulative Jet

Autor: L. A. Kosolapova
Rok vydání: 2021
Předmět:
Zdroj: Lobachevskii Journal of Mathematics. 42:2159-2164
ISSN: 1818-9962
1995-0802
DOI: 10.1134/s199508022109016x
Popis: The dynamics of a gas bubble near a rigid wall with the formation of a cumulative liquid jet under harmonic liquid pressure oscillation is studied. The initial shape of the bubble is varied from slightly oblate to slightly elongated spheroids of the same volume. The liquid pressure oscillates at the natural frequency of the corresponding spherical bubble in the absence of a wall. The liquid is ideal, incompressible, its flow is potential. The investigation is carried out numerically, using the Euler method in time and the boundary elements method in space. Some features of the dependences of the pressure in the bubble and the jet tip velocity and shape on the initial shape of the bubble, its stand-off from the wall, and the liquid pressure oscillation amplitude are revealed. It is shown that for a bubble adjacent to the wall or not far distant from it, the liquid pressure oscillation amplitude does not affect the cumulative jet velocity and shape at the moment of the collision. With growing the distance from the wall, the rise in the amplitude increasingly influence on the cumulative jet shape for a slightly elongated spheroidal bubble and on the jet tip velocity for a slightly oblate spheroidal one.
Databáze: OpenAIRE
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