Pulsating bubbles dynamics near a concave surface

Investigation on the effects of an elliptical wall on the dynamic behaviors of a bubble restricted by two parallel plates

“…The dynamics of the spherical bubbles near rigid boundary have been widely researched. For walls with curvature, cavitation research has mainly focused on curved boundaries [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] and particles [20] , [3] , [21] , [22] , [23] , [24] , [25] , [26] . In the case of curved boundaries, the effects of the wall curvature were considered by Takahira et al [11] , who constructed a dynamic model of a spherical bubble near a curved wall and observed a positive correlation between the wall curvature and the pressure at the center of the wall.…”

“…In addition to the collapse jets, Cui et al [13] and Ma et al [14] also conducted experimental research on the bubble collapse loads, revealing that both the bubble shock waves and collapse loads increase with increasing wall curvature. Furthermore, Cui et al [15] conducted detailed numerical and experimental research on the bubble dynamic behaviors near a concave boundary. They found that, as the curvature increases, the bubble volume near the concave wall is compressed to a smaller extent and the oscillation period increases.…”

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

“…Due to the high costs associated with reduced energy efficiency and repair and downtime for damaged equipment, several cavitation mitigation strategies [26] , [27] , [28] , [29] , [30] , [31] have been explored: (1) Improve the strength of the material by coating or adding manganese, zinc, tungsten, and other chemical elements to the target metal, and improve the resistance of the target by inhibiting the interaction between erosion, cavitation, and corrosion [26] , [27] ; (2) Set up a spoiler structure at the front end of the cavitation generation of underwater machinery, thereby changing the position of cavitation generation and reducing the intensity of cavitation to reduce damage to materials [28] , [29] ; (3) Changing the structure or elastoplasticity of the target surface affects the shape of cavitation bubbles during the collapse, thereby reducing the strength of bubble collapse [30] , [31] . The above methods can all reduce the harm caused by cavitation to a certain extent, but they cannot eliminate this harm.…”