Research on the collapse process of a near-wall bubble

Zhu, Bing; Han, Wang; Xu, Wen-jun; Zhang, Wei

doi:10.1007/s42241-023-0067-2

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…Another experimental direction is related to the study of bubble dynamics in the stage of maximum compression. To visualize the process, the initial bubble size is chosen as being large enough (R > 1 mm) to record the size of the maximally compressed bubble R sq using the available measuring instruments [59][60][61][62][63]. If R sq < 1 µm and the bubble cannot be visualized experimentally, only pressure pulses in the liquid at a distance from the bubble or the degree of erosion damage to the surface are recorded.…”

Section: Dynamics Of a Steam Bubble In Hydrodynamic Cavitation Processesmentioning

confidence: 99%

Numerical Modeling of the Behavior of Bubble Clusters in Cavitation Processes

Pavlenko

2024

Energies

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To study the behavior of a bubble clusters in cavitation devices, a numerical study of the dynamics of bubbles in a compressible liquid was performed, taking into account interfacial heat and mass transfer. The influence of regime and system parameters on the intensity of cavitation processes is considered. Physical and chemical transformations during the cavitation treatment of liquids are caused not only by the action of shock waves and emitted pressure pulses but also by extreme thermal effects. At the stage of extreme compression of the bubble, the vapor inside the bubble and the liquid in its vicinity transform into the state of a supercritical fluid. The presented model analyzes the nature of microflows in the interbubble space and carries out a quantitative calculation of the local values of the parameters of the velocity and pressure fields.

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Section: Dynamics Of a Steam Bubble In Hydrodynamic Cavitation Processesmentioning

confidence: 99%

Numerical Modeling of the Behavior of Bubble Clusters in Cavitation Processes

Pavlenko

2024

Energies

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A comprehensive study of the impact pressure induced by a single cavitation bubble collapsing near a solid wall

Zhao,

Zhang,

Deng

et al. 2024

Physics of Fluids

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We conduct a comprehensive investigation into the wall impacts induced by a single cavitation bubble collapsing near a solid wall, combining numerical simulations with theoretical analysis. We classify the modes of wall impact into three categories based on the standoff distance, γ: pressure wave impact, jet stagnation impact, and water hammer pressure impact. Our findings reveal that the pressure wave impact remains unaffected by the initial radius R0 of the bubble, exhibits a proportional relationship with the square root of the driving pressure Δp, and inversely correlates with γ. We then derive a theoretical expression for the pressure wave impact by drawing insights from energy conversion principles. The jet stagnation impact, on the other hand, is directly proportional to Δp as well as the square of a polynomial involving γ. By quantifying the velocity of the jet impact based on its formation mechanism, we obtain theoretical expressions for both the jet stagnation and water hammer pressure impacts. In accordance with the specific ranges of occurrence and magnitude distribution for each type of impact, we propose the ultimate impact prediction model. When γ>1.97, the predominant source of maximum impact pressure on the wall is attributed to the pressure wave impact, reaching magnitudes of 106 Pa. For γ values ranging from 1.73 to 1.97, the principal contributor to the maximum impact pressure on the wall shifts to the jet stagnation impact, reaching levels of 107 Pa. Conversely, when γ≤1.73, the predominant cause of maximum impact pressure on the wall is the water hammer effect, with magnitudes reaching 108 Pa. This study provides a novel perspective on analyzing the mechanics of wall impacts during the collapse of a cavitation bubble near a solid surface, and the developed models offer valuable insights for predicting and mitigating cavitation erosion.

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Research on the collapse process of a near-wall bubble

Cited by 2 publications

References 31 publications

Numerical Modeling of the Behavior of Bubble Clusters in Cavitation Processes

Numerical Modeling of the Behavior of Bubble Clusters in Cavitation Processes

A comprehensive study of the impact pressure induced by a single cavitation bubble collapsing near a solid wall

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