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Research Papers: Fundamental Issues and Canonical Flows

Numerical and Experimental Study of Bubble Impact on a Solid Wall

[+] Author and Article Information
B. Y. Ni, A. M. Zhang

College of Shipbuilding Engineering,
Harbin Engineering University,
Harbin 150001, China

G. X. Wu

Department of Mechanical Engineering,
University College London,
London WC1E 7JE, UK
e-mail: g.wu@ucl.ac.uk

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 21, 2013; final manuscript received October 10, 2014; published online December 3, 2014. Editor: Malcolm J. Andrews.

J. Fluids Eng 137(3), 031206 (Mar 01, 2015) (16 pages) Paper No: FE-13-1252; doi: 10.1115/1.4028798 History: Received April 21, 2013; Revised October 10, 2014; Online December 03, 2014

The dynamic characteristics of a bubble initially very close to a rigid wall, or with a very narrow gap, are different from those of a bubble away from the wall. Especially at the contraction stage, a high-speed jet pointing toward the wall will be generated and will impact the rigid surface directly, which could cause more severe damage to the structure. Based on the velocity potential theory and boundary element method (BEM), the present paper aims to overcome the numerical difficulty and simulate the bubble impact on a solid wall for the axisymmetric case. The convergence study has been undertaken to verify the developed numerical method and the computation code. Extensive experiments are conducted. Case studies are made using both experimental data and numerical results. The effects of dimensionless distance on the bubble dynamics are investigated.

Copyright © 2015 by ASME
Topics: Bubbles
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References

Figures

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Fig. 1

Sketch of the problem with Cartesian and polar coordinate systems

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Fig. 2

Sketch of removal procedure of the water layer

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Fig. 3

Sketch of contact jet impact

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Fig. 4

Sketch of experimental setup

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Fig. 5

Calculation of the volume of the bubble from the experimental data

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Fig. 6

Volume history of the bubble at different meshes

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Fig. 7

Volume history of the bubble at different time steps

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Fig. 8

Sketch of removal procedure of the water layer through the merge

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Fig. 9

Sketch of two identical jets collision

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Fig. 10

Comparison of deformation of the bubble by Image Method (left) and Direct Method (right)

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Fig. 11

Comparison of the bubble volume history by image method and direct method

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Fig. 12

Comparison of the jet tip velocity of the bubble by image method and direct method

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Fig. 13

Comparison between numerical and experimental results of the bubble evolution with time at λ=0.45

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Fig. 14

The evolution of a bubble in the radial jet stage at λ = 0.45

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Fig. 15

Comparison of bubble volumes (λ=0.45)

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Fig. 16

Comparison of bubble jet velocities (λ=0.45)

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Fig. 17

Variation of the pressure inside the bubble

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Fig. 18

Pressure distribution on the wall

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Fig. 19

Comparison between numerical and experimental results of the bubble evolution with time at λ=0.15

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Fig. 20

Comparison of the bubble volumes (λ=0.15)

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Fig. 21

Comparison of the bubble jet velocities (λ=0.15)

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Fig. 22

Variation of the time of jet impacting at different λ

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Fig. 23

Variation of the jet tip velocity at the moment of impact with different λ

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