Overpressure generation and repetition of collapsing microbubbles induced by shock wave reflection in a narrow gap

A. Abe, K. Ohtani, K. Takayama

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1 Citation (Scopus)

Abstract

This paper reports the summary of experiments performed to successive generate small-scale underwater shock waves by means of shock-induced collapse of microbubbles confined in a narrow gap. The project is motivated to develop a method for efficient inactivation of marine bacteria contained in ship ballast water by high impulsive pressure loading. The shock wave-air bubbles interaction was visualized by shadowgraph; the images were recorded by ImaCon200, and simultaneous pressure measurements were performed by using an optical fiber pressure transducer with higher temporal resolution. Attaching small air bubbles on a single nylon fiber and placing it in a confined space, we demonstrated sequential generation of impulsive high pressures at the successive collapses of small bubbles at incident and reflected shock loadings. The values of the very short impulsive pressures that occurred repeatedly for a relatively long term are found high enough to inactivate marine bacteria.

Original languageEnglish
Pages (from-to)331-339
Number of pages9
JournalShock Waves
Volume21
Issue number4
DOIs
Publication statusPublished - 2011 Aug

Keywords

  • Bubble collapse
  • Inactivation technology
  • Microbubbles
  • Narrow gap
  • Underwater shock wave

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy(all)

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