Analysis of pressure field generated by a collapsing bubble

Li, S.; Han, Rui; Zhang, A-Man; Wang, Qianxi

doi:10.1016/j.oceaneng.2016.03.016

Cited by 91 publications

(41 citation statements)

References 52 publications

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“…The pressure peak decreases with F r and multiple pressure peaks can be observed when F r ≤ 4. Generally, the first pressure peak relates to the violent jet impact and the subsequent pressure peak relates to the combination of the high-pressure gas and the decaying jet flow [54]. Therefore, for a large scale airgun-bubble, describing the bubble oscillation with the spherical bubble theory will neglect the significant jetting behavior during the collapse phase, which has a great effect on the pressure wave emissions.…”

Section: Effects Of Gravitymentioning

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: Effects Of Gravitymentioning

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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“…calculations of the velocity and pressure fields in our previous paper (Li et al, 2016). At t * = 0.45, the coalescence criterion is met and they are still expanding.…”

Section: Effects Of Buoyancymentioning

confidence: 81%

Modelling for three dimensional coalescence of two bubbles

Han

Zhang

et al. 2016

Physics of Fluids

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This paper is concerned with the three dimensional interaction and coalescence of two bubbles subject to buoyancy and the dynamics of the subsequent joined bubble using the boundary integral method (BIM). An improved density potential method is implemented to control the mesh quality. It helps to avoid the numerical instabilities which occur after coalescence. Numerical convergence tests are conducted in terms of mesh sizes and time steps. The 3D numerical model agrees well with an axisymmetric BIM model for axisymmetric cases as well as experimental results captured by high-speed camera. The bubble jetting, interaction and coalescence of the two bubbles depend on the maximum bubble radii, the centre distance between two bubbles at inception and the angle β between the centre line and the direction of buoyancy. We investigate coalescence of two bubbles for β = 0, π/4, and π/2, respectively, and at various centre distances at inception. Numerical results presented include the bubble and jet shapes, the velocity and pressure fields surrounding the bubbles, as well as the time histories of bubble volumes, jet velocities and positions of centroid of the bubble system.

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“…e characteristics of the pressure loading due to the bubble collapse have drawn much attention. Li et al gave a detailed analysis of the pressure field on the target surface above which the bubble is formed through the boundary element method validated by the spark-generated bubble [13]. e induced bubble pressure is analyzed deeply by dividing the whole pressure into two parts, which are discussed separately.…”

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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Analysis of pressure field generated by a collapsing bubble

Cited by 91 publications

References 52 publications

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

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

Modelling for three dimensional coalescence of two bubbles

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

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