Letter: Entrapment and interaction of an air bubble with an oscillating cavitation bubble

Kannan, Y.S.; Karri, Badarinath; Sahu, Kirti Chandra

doi:10.1063/1.5025122

Cited by 25 publications

(7 citation statements)

References 16 publications

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“…Therefore, a spark device is utilized to study the interaction of cavitation bubbles with a phase difference [19,20], the interaction between cavitation bubbles and rigid particles [21][22][23][24], the interaction between cavitation bubbles and a free surface [25][26][27][28], and the interaction between cavitation bubbles and air bubbles [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Improved Instruments and Methods for the Photographic Study of Spark-Induced Cavitation Bubbles

Zhang

Zhai

2018

Water

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An underwater spark is able to induce a cavitation bubble, and this principle has been utilized to make cavitation bubble generators for several decades. In this paper, an improved instrument for generating spark-induced cavitation bubbles is described in detail. The voltage time history inside the instrument is measured to show the working process and principle. Cavitation bubbles are generated by the instrument and recorded by a high-speed camera. The radius time history of the bubble is obtained using an image processing algorithm. The ratio of its minimum radius to its maximum radius reaches ~0.2, which indicates that there is little undissolved gas in the bubble. With the radius time history, the velocity fields around the bubbles were calculated by the 1D continuity flow equation, and the pressure fields were calculated by the 1D Euler equation. One cavitation bubble is chosen and discussed in detail. The velocity and pressure on the bubble interface achieve their maximums (~25 m/s and ~1.2 MPa, respectively) at the same time, when the radius is at its minimum (~1 mm). Some statistical results are also presented to show the effect of the instrument.

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Section: Introductionmentioning

confidence: 99%

Improved Instruments and Methods for the Photographic Study of Spark-Induced Cavitation Bubbles

Zhang

Zhai

2018

Water

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“…Other instability behaviours can also be observed to disturb and affect the entire air entrainment process, such as the adjacent deformed free surfaces, an air bubble transported upstream, and the interaction among other air–water structures. These microscopic behaviours are common for air–water flows 24 , which may have a specific instability influence acting in a particular period.…”

Section: Resultsmentioning

confidence: 96%

“…During the surface entrapment development process, the curvature at the boundary of the entrapped surface becomes sharply deformed in the late instable period. This can lead to a pressure difference between both sides of the air–water interface regions 24,27 . The pressure is higher in the water than in the air region, driving the interface from the water phase into the air phase.…”

Section: Discussionmentioning

confidence: 99%

Bubble formation and scale dependence in free-surface air entrainment

Wei

Deng

et al. 2019

Sci Rep

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The air bubble entrainment and self–aeration phenomena in free-surface water flows reveal a rich interplay of fundamental science and engineering, and the size distribution of the entrained bubbles enhances the air–water gas flux, improves the gas transfer, and influences the cavitation erosion protection in high–speed flows. In the present study, we investigate the bubble–formation mechanism of free–surface air entrainment and the related microscopic bubble scale in the laboratory. This paper provides a quantitative description of bubble entrainment. The entrapment deformation of the local free surface over a period follows a power–law scaling and entrains a bubble when the entrapped surface becomes enclosed in the unstable movement period. Both the size scale and shape character of the entrapped free surface determine the size and skewness of the distribution of the air bubble. The entrapment deformation process confirms that the instability behaviour of the local air–water interface results in the onset of bubble entrainment. Further research is necessary to elucidate the instability criterion dominated by the interface instability and promote a new understanding of multiphase flow generation and development.

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“…More generally, the non-spherical bubble dynamics is highly dependent on boundary conditions. The interactions between a single bubble and many kinds of boundaries have been investigated, such as free surfaces [21,22,23], elastic membranes [24], suspended objects [25,26], floating structures [27,28], other bubbles [29,30], etc. Nevertheless, the presence of the airgun-body itself imposes an additional important geometric boundary condition which is quite different from those mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a toroidal bubble on a cylinder surface with an application to geophysical exploration

Li,

Prosperetti,

van der Meer

2020

Preprint

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During the operation of a seismic airgun source, a certain amount of compressed highpressure air is released from the airgun chamber into the surrounding water, generating an expanding toroidal bubble attached to the airgun-body. The subsequent oscillations of the bubble generate low-frequency pressure waves, which are used to map the ocean subbottom, e.g., to locate oil and gas reserves. The bubble dynamic behavior and the emitted pressure waves are inevitably influenced by the airgun-body. However, the bubbleairgun-body interaction is far from well understood. This paper investigates the strong interaction between a long cylinder and an attached toroidal bubble via hundreds of boundary integral simulations, aiming to provide new physical insights for airgun-bubble dynamics. Firstly, the overall physical phenomena are discussed and three types of bubble collapse patterns are identified, namely (i) upward jetting due to gravity, (ii) annular jet toward the cylinder body and (iii) weak/no jet. Thereafter, we investigate the effects of the cylinder radius, initial bubble pressure and Froude number on the bubble oscillation period and the pressure wave induced by the bubble. At last, the impact of a cylinder on a Sercel type airgun-bubble is discussed with a particular focus on the spectrum of the pressure waves.

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Letter: Entrapment and interaction of an air bubble with an oscillating cavitation bubble

Cited by 25 publications

References 16 publications

Improved Instruments and Methods for the Photographic Study of Spark-Induced Cavitation Bubbles

Improved Instruments and Methods for the Photographic Study of Spark-Induced Cavitation Bubbles

Bubble formation and scale dependence in free-surface air entrainment

Dynamics of a toroidal bubble on a cylinder surface with an application to geophysical exploration

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