The dynamics of a gas bubble in liquid near a rigid surface

A. A. Aganin ; L. A. Kosolapova ; V. G. Malakhov

Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, Tome 160 (2018) no. 1, pp. 154-164

Résumé

The axisymmetric dynamics of a gas bubble in liquid near a plane rigid surface (wall) during its expansion and subsequent compression with the transition to the toroidal phase of motion has been studied. It has been assumed that the liquid is ideal incompressible, its flow being potential. The position of the bubble contour and the potential on it have been found by the Euler method, the fluid velocity on the contour has been derived by the boundary element method. The shape of the bubble, its internal pressure, liquid velocity, and pressure around the bubble have been determined. The pressure profiles on the wall and along the axis of symmetry have been presented. It has been found that at an initial distance $d_0$ between the bubble and the wall less than a certain value $d^*$ the thickness of the liquid layer between the bubble and the wall during bubble compression until the moment of transition to the toroidal phase of the motion decreases, while at the initial distance $d_0$ greater than $d^*$ it increases. In addition, the liquid layer thickness at the moment of transition to the toroidal phase increases with increasing the initial distance $d_0$ between the bubble and the wall. It has been shown that in the toroidal phase of bubble dynamics the maximum pressure in the liquid near the bubble is located in the region of impact of the cumulative jet on the surface of the liquid layer between the bubble and the wall. In this case, the action of the jet can lead to the appearance of local deformations of the bubble surface (a splash inside the bubble) moving away from the axis of symmetry as the jet displaces the liquid between the bubble and the wall.

Détail

Keywords: cavitation bubble, toroidal bubble, potential liquid flow, boundary element method, distance from bubble to wall.

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