Bubble motion in the linear shear flow

Akiko Fujiwara, Koichi Hishida

Research output: Contribution to journalArticle

Abstract

The objective of the present study is to obtain fundamental knowledge of the influence of the lift force on the bubble and its motion induced by the surrounding flow field. We explored the flow structure in the vicinity of the bubble and also deformation of the bubble shape respectively by PIV/LIF and a projecting technique. As our system, we chose a single air bubble with an equivalent bubble diameter (Deq) 1∼8 mm, in a vertical shear flow. Velocity measurements were made using one digital high-speed CCD camera for Digital Particle Image Velocimetry (DPIV) with fluorescent tracer particles. The recorded image data are analyzed by cross-correlation technique. A second CCD camera was used to detect the bubble's shape and translational motion via backlighting from a square array of infrared LEDs. We confirmed that the bubble deformation and surrounding flow induced lateral force on bubble. We proposed the lateral force parameter ar which consisted of the relative velocity of the bubble and the circulation around the flow structure in the vicinity of the bubble measured by PIV/LIF. Bubble motion can be estimated by ar with the phase which depends on the circulation around the bubble.

Original languageEnglish
Pages (from-to)696-703
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume68
Issue number667
DOIs
Publication statusPublished - 2002 Mar

Keywords

  • Bubble
  • Bubble shape
  • Force
  • Multiphase flow
  • PIV/LIF/IST
  • Shear flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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