Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 1: 99 - 110

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.118

Naval Architecture, Ocean and Civil Engineering

Pulsating Bubble Collapse and Jet Characteristics Near the Nozzle of Underwater Tube

  • ZHANG Yueyao ,
  • QIAO Feng ,
  • Lü Xiang ,
  • ZHANG Tianyuan ,
  • HAN Rui ,
  • LI Shuai
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  • a. College of Nuclear Science and Technology; b. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China

Received date: 2023-04-03

  Revised date: 2023-05-18

  Accepted date: 2023-06-29

  Online published: 2023-07-20

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Abstract

In this paper, the characteristics of a pulsating bubble collapse near the nozzle of an underwater tube were investigated both experimentally and numerically. The experiments involved generating pulsating bubbles using the electric spark discharge technology and capturing their transient behavior by high-speed photography. A boundary integral method based on potential flow theory was used to simulate the coupling between the bubble and the tube in the numerical simulation. The results show that the collapsing bubble can produce a jet directed towards the tube, which poses a safety threat to the pipeline equipment. The numerical simulation results and experimental phenomena are in good agreement. In addition, a systematic study was conducted of two dimensionless parameters, i.e., the ratio of bubble distance from the tube nozzle and the tube nozzle radius γ and the ratio of the maximum radius of the bubble and the tube nozzle radius λ. The findings indicate that when γ≤1.5, bubbles will only produce jets pointing into the tube during the collapse phase, and when γ>1.5, the tendency for bubbles to produce jets pointing into the tube increases as λ increases. Moreover, the maximum velocity of the downward jet increases with the increase of λ, and increases and then decreases with the increase of γ. Additionally, the maximum velocity of the downward jet generally increases with the increase of λ and increases and then decreases with the increase of γ. This study provides valuable insights into the dynamic behavior of bubble collapse near the nozzle of a submerged tube, which can provide safety measures for pipeline equipment.

Key words： bubble dynamics; bubbles near the nozzle of the tube; boundary integral method; high-speed photography

Cite this article

ZHANG Yueyao , QIAO Feng , Lü Xiang , ZHANG Tianyuan , HAN Rui , LI Shuai . Pulsating Bubble Collapse and Jet Characteristics Near the Nozzle of Underwater Tube[J]. Journal of Shanghai Jiaotong University, 2025 , 59(1) : 99 -110 . DOI: 10.16183/j.cnki.jsjtu.2023.118

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