Jet orientation of a collapsing bubble near a solid wall with an attached air bubble

Goh, Bing Hui Terence; Ohl, Siew-Wan; Klaseboer, Evert; Khoo, Boo Cheong

doi:10.1063/1.4870244

Cited by 35 publications

(12 citation statements)

References 41 publications

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“…Luo et al (2013) observed the deformation of an air bubble with the effect of the cavitation bubble. In addition, Goh et al (2014) also found that the ratio of the oscillation time of the cavitation bubble to that of the air bubble is an important parameter in determining the direction of the jet of the cavitation bubble. Luo, Xu & Li (2019a) measured the sound pressure difference of cavitation bubble collapse based on the air bubble nearby with high-speed photography and a high-precision underwater sonar detection system and found that the existence of the air bubble can reduce the sound pressure during the collapse of the cavitation bubble.…”

Section: Introductionmentioning

confidence: 97%

Stratification effect of air bubble on the shock wave from the collapse of cavitation bubble

Khoo

2021

J. Fluid Mech.

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Section: Introductionmentioning

confidence: 97%

Stratification effect of air bubble on the shock wave from the collapse of cavitation bubble

Khoo

2021

J. Fluid Mech.

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“…Goh et al . 15 studied the interactions between hemispheric air bubbles placed below the underwater slab and a cavitation bubble, and discovered that the ratio between oscillation time of the cavitation bubbles and the oscillation time of the air bubbles is the important parameter impacting the jet caused by cavitation bubbles collapse. The interaction between a cavitation bubble and a particle was researched by adopting a high-voltage discharge technology to induce cavitation bubble 16 and low-voltage underwater discharge technology to induce a cavitation bubble 17 .…”

Section: Introductionmentioning

confidence: 99%

Jet and Shock Wave from Collapse of Two Cavitation Bubbles

Niu

2019

Sci Rep

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As a common hydrodynamic phenomenon, multi-cavitation dynamics is widely found in many industries such as hydraulic engineering, shipping industry and chemical industry. The jet and shock wave phenomenon in the interaction of two cavitation bubbles are the basis of multi-cavitation bubbles interaction research. By respectively inducing two cavitation bubbles through laser and underwater low-voltage discharge, this paper tested the jet and shock wave resulting from the collapse of the two cavitation bubbles, and the following conclusions are obtained: (1) If the two cavitation bubbles are synchronously generated but in different size, as the distance between the two cavitation bubbles increases or the maximum radius of the smaller cavitation bubble increases, the effect of the small cavitation bubble on the larger one gradually changes from the surface wave phenomenon to jet that breaks through the larger bubble. When the two bubble center lines are parallel to the wall surface, this jet suppresses the formation of the jet to the wall surface when the large cavitation bubble collapses; if the two cavitation bubbles are generated at the same time with same size, as the initial distance of the two cavitation bubbles gradually decreases, the two bubbles are more likely to form a face-to-face collapse, and the smaller the distance between the two, the easier it is to fuse. (2) The impact of the initial moment of the cavitation bubble on the structure of the collapse shock wave is as follows: for two bubbles of different sizes formed synchronously, the shock wave propagates to the periphery in the form of a number of consecutive waves appearing in the larger bubble, while for the unsynchronized ones, shock waves appeared in both cavitation collapses, and a number of consecutive waves appear in the late-formed cavitation bubble. And multiple consecutive shock waves may overlap in some areas of the space. These conclusions have obvious implications for preventing cavitation damage and utilization of cavitation.

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“…In the past few decades, a large amount of works have been undertaken to understand the characteristics of bubble collapse [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Lauterborn recorded the process of a single bubble collapsing near a rigid wall, in which the shock wave emission was captured by a schlieren system [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Collapse of Multiple Bubbles and the Energy Conversion during Bubble Collapse

Zhang

Deng

2019

Water

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This paper investigates numerically the collapses of both a single cavitation bubble and a cluster consisting of 8 bubbles, concerning mainly on the conversions between different forms of energy. Direct numerical simulation (DNS) with volume of fluid (VOF) method is applied, considering the detailed resolution of the vapor-liquid interfaces. First, for a single bubble near a solid wall, we find that the peak value of the wave energy, or equivalently the energy conversion rate decreases when the distance between the bubble and the wall is reduced. However, for the collapses of multiple bubbles, this relationship between the bubble-wall distance and the conversion rate reverses, implying a distinct physical mechanism. The evolutions of individual bubbles during the collapses of multiple bubbles are examined. We observe that when the bubbles are placed far away from the solid wall, the jetting flows induced by all bubbles point towards the cluster centre, while the focal point shifts towards the solid wall when the cluster is very close to the wall. We note that it is very challenging to consider thermal and acoustic damping mechanisms in the current numerical methods, which might be significant contributions to the energy budget, and we leave it open to the future studies.

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Jet orientation of a collapsing bubble near a solid wall with an attached air bubble

Cited by 35 publications

References 41 publications

Stratification effect of air bubble on the shock wave from the collapse of cavitation bubble

Stratification effect of air bubble on the shock wave from the collapse of cavitation bubble

Jet and Shock Wave from Collapse of Two Cavitation Bubbles

Numerical Study of the Collapse of Multiple Bubbles and the Energy Conversion during Bubble Collapse

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