Highly magnifying PTV measurement for drag reducing turbulent structure in a microbubble flow channel

Kanako Suzuki, Kazushi Aoki, Koichi Hishida, Yoshiaki Kodama

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The phenomenon of the drag reduction effect with microbubble has been studied experimentally. We revealed the drag reduction effect by using two types of bubbles which are generated in tap water and that with surfactant. We have approached by wall shear stress measurement and flow visualization by using Highly Magnifying PTV with telecentric lens. In both bubble flows, the experiments have been carried out with the Reynolds number ranging from 10 000 to 50 000 and void fraction up to 0.04. In condition of drag reduction effect observed, injecting bubble diameter was 0.6-1.3 mm and the ejection and sweep event were reduced by bubble injection and Reynolds stress was decreased.

Original languageEnglish
Pages (from-to)1247-1256
Number of pages10
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume74
Issue number6
DOIs
Publication statusPublished - 2008 Jun

Keywords

  • Drag reduction
  • Micro-bubble
  • PTV
  • Reynolds stress
  • Shear stress
  • Turbulence

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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