Spark-generated bubble near an elastic sphere

Goh, Bing Hui Terence; Gong, S.W.; Ohl, Siew-Wan; Khoo, Boo Cheong

doi:10.1016/j.ijmultiphaseflow.2016.03.021

Cited by 55 publications

(18 citation statements)

References 28 publications

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“…Since the associated Mach number in this experiment is below 0.02, the compressibility of the liquid can be neglected. The heat transfer is also ignored in this case and the polytropic constant is taken as 1.25 [20,44]. Figure 2 shows the bubble motion during the first cycle and the early second cycle, in which each experimental image (side view) is overlaid with the numerical results (denoted by the blue lines).…”

Section: Comparison Of the Non-spherical Bubble Motion Between Experimentioning

confidence: 99%

Modelling large scale airgun-bubble dynamics with highly non-spherical features

Meer

Zhang

et al. 2020

International Journal of Multiphase Flow

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A thorough understanding of the dynamics of meter-sized airgun-bubbles is very crucial to seabed geophysical exploration. In this study, we use the boundary integral method to investigate the highly non-spherical airgunbubble dynamics and its corresponding pressure wave emission. Moreover, a model is proposed to also consider the process of air release from the airgun port, which is found to be the most crucial factor to estimate the initial peak of the pressure wave. The numerical simulations show good agreement with experiments, in terms of non-spherical bubble shapes and pressure waves. Thereafter, the effects of the port opening time T open , airgun firing depth, heat transfer, and gravity are numerically investigated. We find that a smaller T open leads to a more violent air release that consequently causes stronger high-frequency pressure wave emissions; however, the low-frequency pressure waves are little affected. Additionally, the non-spherical bubble dynamics is highly dependent on the Froude number F r. Starting from F r = 2, as F r increases, the jet contains lower kinetic energy, resulting in a stronger energy focusing of the bubble collapse itself and thus a larger pressure peak during the bubble collapse phase. For F r ≥ 7, the spherical bubble theory becomes an appropriate description of the airgun-bubble. The new findings of this study may provide a reference for practical operations and designing environmentally friendly airguns in the near future.

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Section: Comparison Of the Non-spherical Bubble Motion Between Experimentioning

confidence: 99%

Modelling large scale airgun-bubble dynamics with highly non-spherical features

Meer

Zhang

et al. 2020

International Journal of Multiphase Flow

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“…Taylor et al proposed a new method to generate pressure waves by using the nonequilibrium microsecond pulsed spark [2]. Goh et al studied the spark-generated bubble near an elastic sphere [3], in which the affection of the elasticity, the dimensionless standoff, the size ratio of the bubble, and the elastic sphere perimeter on the interaction between the bubble and the elastic sphere is discussed. Li et al studied the interaction between the spark-generated bubble and a suspended rigid sphere [4].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Approach to the Measurement of Wall Pressure Generated by an Underwater Spark‐Generated Bubble by a Hopkinson Bar

Yao

Cui

Guo

et al. 2019

Shock and Vibration

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e wall pressure loading due to the underwater spark-generated bubble, having served as an efficient technique to study the underwater explosion, has drawn much attention. Compared with the numerical study of the pressure characteristics, the direct experimental investigation is much rarer. Recently, an improved pressure-measuring system by using a Hopkinson pressure bar as the sensing element is proposed, set up, and validated by the current authors. In this article, the improved methodology and experimental system is used to detect and analyze the pressure loading on the target plate surface due to the underwater spark-generated bubble beneath the plate. A series of experiments with 3 mm, 5 mm, 10 mm, 15 mm, . . ., 60 mm standoffs are carried out. e experimental results and the related analysis and discussions are presented. Based on the results, the improved methodology can be used to detect the pressure loading due to the spark-generated bubble. ere is multipeak oscillation near the peak of the shock pressure loading profile. e peak pressure versus the standoff is also summarized. According to the characteristics of the induced water jet pressure and the bubble-collapse pressure loading given in this article, enough attention should be paid to not only the jet and the first bubble-collapse pressure loadings but also the secondary bubble-collapse pressure loadings especially when the dimensionless distance c > 1.

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“…Thus the prediction of the nonlinear interaction and coalescence of two bubbles requires three-dimensional modelling. Numerous studies have been conducted on single bubble dynamics under different boundary conditions using 3D BIM [28][29][30][31][32][33][34][35] . However, the complex topological treatment during bubble coalescence renders the development of a 3D model difficult.…”

Section: Introductionmentioning

confidence: 99%

A three-dimensional modeling for coalescence of multiple cavitation bubbles near a rigid wall

Tao

2019

Physics of Fluids

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Boundary Integral Method (BIM) has been widely and successfully applied to cavitation bubble dynamics, however, the physical complexities involved in the coalescence of multiple bubbles are still challenging for numerical modelling. In this study, an improved three-dimensional (3D) BIM model is developed to simulate the coalescence of multiple cavitation bubbles near a rigid wall, including an extreme situation when cavitation bubbles are in contact with the rigid wall. As the first highlight of the present model, a universal topological treatment for arbitrary coalescence is proposed for 3D cases, combined with a density potential method and an adaptive remesh scheme to maintain a stable and high-accuracy calculation. Modelling for the multiple bubbles attached to the rigid boundary is the second challenging task of the present study. The effects of the rigid wall are modelled using the method of image, thus the boundary value problem is transformed to the coalescence of real bubbles and their images across the boundary. Additionally, the numerical difficulties associated with the splitting of a toroidal bubble and self-coalescence due to the self-film-thinning process of a coalesced bubble are successfully overcome. The present 3D model is verified through convergence studies and further validated by the purposely conducted experiments. Finally, representative simulations are carried out to elucidate the main features of a coalesced bubble near a rigid boundary and the flow fields are provided to reveal the underlying physical mechanisms.

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Spark-generated bubble near an elastic sphere

Cited by 55 publications

References 28 publications

Modelling large scale airgun-bubble dynamics with highly non-spherical features

Modelling large scale airgun-bubble dynamics with highly non-spherical features

An Experimental Approach to the Measurement of Wall Pressure Generated by an Underwater Spark‐Generated Bubble by a Hopkinson Bar

A three-dimensional modeling for coalescence of multiple cavitation bubbles near a rigid wall

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