Observation of single and continuous bubbles rising in reduced pressure vessel

Takehiko Kumagai, Yasuo Kishimoto, Osamu Nakamura, Toshio Tagawa, Takehiro Himeno, Shinichi Shimasaki

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The expansion and shape change behaviors of a single rising bubble and continuously rising bubbles in a reduced pressure vessel were observed. The main results obtained are as follows: 1) The aspect ratio, w/h, of a single rising bubble under reduced pressure is almost the same as that under atmospheric pressure. However, the width of the rising bubble expanded to 1.4 times, which is larger than the calculated expansion ratio. This may be explained by the change of the bubble shape while rising. 2) The observed single bubble shapes were ellipsoidal, spherical cap, and breakup of spherical cap. The upward velocity of the bubble increases with the initial volume of the bubble. The upward velocity also increases as the bubble rises.

Original languageEnglish
Pages (from-to)93-100
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number2
Publication statusPublished - 2015


  • Cold model
  • Expansion of bubble
  • Single rising bubble
  • Vacuum refining

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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