Cavitation bubble collapse in a vicinity of a rigid wall with a gas entrapping hole

Abstract

This paper aims to reveal the influence of a rigid wall with a gas entrapping hole on the characteristics of the dynamic behavior of a laser-induced bubble collapse. A high-speed camera system was used to record the oscillation process of the laser-induced bubble on a rigid wall with a gas entrapping hole. When a bubble is generated by a laser above the wall with a gas entrapping hole, the entire bubble collapse stays away from the wall or splits into two bubbles because of a radial jet induced by bubble contraction. These two distinctive collapse modes are dependent on the distance between the wall and the bubble. The focus of this study is the quantitative analysis of the jet formation, bubble migration, and oscillation period, and compared with the behavior of the bubble near a rigid wall. The results show that unlike the generation of the bubble near a rigid wall, a rigid wall with a gas entrapping hole affects the morphology of the jet and changes the direction of migration of the bubble, and decreases the oscillation period. Thus, the rigid wall with a gas entrapping hole could be effective for reducing cavitation erosion on the wall surface, which is supported by our experiment results.

Visual experimental study on cavitation performance of double-suction centrifugal pump

“…Table 1 shows the target parameters of the study model. Table 2 shows a description of the cavitation criteria and associated parameters that may be relevant in this article [12][13][14][15][16][17][18]. • NPSH3: The cavitation allowance tested by the double suction centrifugal pump when the head drops by 3%.…”

Bubble collapse near porous plates

“…Similarly, Sun et al. (2022 b ) investigated bubble collapse near a rigid surface with a gas-entrapping hole. This concept was also investigated by Gonzalez-Avila et al.…”

“…Some research has investigated the problem of a plate with a through-hole bounding a free surface in relation to breaches of maritime hulls (Cui et al 2021(Cui et al , 2022He et al 2021). Similarly, Sun et al (2022b) investigated bubble collapse near a rigid surface with a gas-entrapping hole. This concept was also investigated by Gonzalez-Avila et al (2020) and Sun et al (2022a), who considered surfaces with a pattern of gas-entrapping holes.…”

Manipulation of bubble collapse patterns near the wall of an adherent gas layer

“…In recent years, researchers have found that near the water–air free interface or bubbles, cavitation bubbles can generate jets away from the interface or bubbles [14] , [32] , [33] , [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] . Gonzalez et al [32] fabricated mushroom-shaped microcavities on SiO2/Si substrates, which can effectively capture air underwater.…”

“…The potential flow model theory validates this assumption and reproduces the repellent effect of the surface on cavitation bubbles. Sun et al [33] studied the different dynamic characteristics of cavitation bubble collapse near a rigid wall with a gas-entrapping hole. There are two modes of cavitation bubbles near the wall with a gas entrapping hole, which are moving away from the wall and splitting into two bubbles, depending on the distance between the wall and the bubble.…”