3D Toroidal Bubbles Near a Rigid Wall

Zhang, Y. L.; Yeo, K. S.; Khoo, Boo Cheong; Wang, Qianxi

doi:10.1007/978-94-010-0796-2_43

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Bubbles’ pulsation characteristics near object surfaces are widely studied in many fields, such as underwater explosions [ 1 , 2 ], damage to propellers by cavitation bubbles [ 3 , 4 ], ultrasonic cleaning [ 5 , 6 ], medical treatment [ 7 ], etc. Many previous studies proved that boundary conditions (such as fixed boundaries [ 8 , 9 , 10 ], free surfaces [ 11 , 12 , 13 ], elastic boundaries [ 13 ], and motion boundaries [ 14 ]) greatly affect the bubbles’ pulsation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Influence of Different Curved Rigid Boundaries on Electric Spark Bubbles

Shi

Chen

et al. 2020

Materials

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It is well known that the bubble dynamics and load characteristics of cavitation bubbles depend to a great extent on their proximity to the boundary. The purpose of this study is to explore the relationship between the boundary curvature and bubble dynamics, as well as the load characteristics, and summarize the relevant change laws. This study takes three hemispheres of different curvatures and one flat board as its main research boundaries. The hemisphere was chosen as the curved surface boundary because the hemisphere represents the simplest type of curved surface boundary. This method allowed us to easily observe the experimental results and summarize the change laws of bubble dynamics and load characteristics. A high voltage electricity of 400 V was used to produce stable and repeatable electric spark bubbles in this experiment. Since the pulsation time of the bubbles is very short, we used a high-speed camera to acquire the necessary photographs. We also used a Hopkinson bar (HPB) to measure the bubble collapse load. Suppose that the dimensionless parameter of curvature is ζ and the dimensionless parameter of the explosion distance is γ. By summarizing the 44 groups of the experimental results under different combinations of ζ and γ, we found that the cavitation bubble dynamics and loading characteristics are affected by ζ. With an increase of ζ, the shockwave load and bubble collapse load will decrease. In addition, in terms of load characteristics, this study further verified the change trend of the shockwave load and bubble collapse load with γ. For the bubble shrink shape, this paper illustrates the relationship between the bubble’s shrink shape and its shrinkage speed. Four typical bubble shrink shapes are summarized. The effects of different ζ and γ values on the jet are preliminarily explored using the experimental results, and, by considering the experimental results, the developmental trends of the time of the bubble’s first pulsation period are discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental Research on the Influence of Different Curved Rigid Boundaries on Electric Spark Bubbles

Shi

Chen

et al. 2020

Materials

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A Numerical and Experimental Study of Wall Pressure Caused by an Underwater Explosion Bubble

Chen

Yao

Cui

2018

Mathematical Problems in Engineering

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The bubble dynamics behaviors and the pressure in the wall center are investigated through experimental method and numerical study. In the experiment, the dynamics of an underwater explosion (UNDEX) bubble beneath a rigid wall are captured by highspeed camera and the wall pressure in the wall center is measured by pressure transducer. To reveal the process and mechanism of the pressure on a rigid wall during the first bubble collapse, numerical studies based on boundary element method (BIM) are applied. Numerical results with two different stand-off parameters ( = 0.38 and = 0.90) show excellent agreement with experiment measurements and observations. According to the experimental and the numerical results, we can conclude that the first peak is caused by the reentrant jet impact and the following splashing effect enlarged the duration of the first jet impact. When = 0.38, the splashing jet has a strong impact on the minimum volume bubble, a number of tiny bubbles, formed like bubble ring, are created and collapse more rapidly owing to the surrounding high pressure and emit multi shock waves. When = 0.90, the pressure field around the bubble is low enough only a weak rebounding bubble peak occurs.

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3D Toroidal Bubbles Near a Rigid Wall

Cited by 2 publications

References 6 publications

Experimental Research on the Influence of Different Curved Rigid Boundaries on Electric Spark Bubbles

Experimental Research on the Influence of Different Curved Rigid Boundaries on Electric Spark Bubbles

A Numerical and Experimental Study of Wall Pressure Caused by an Underwater Explosion Bubble

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