Flow structure around branch point and periodical oscillation in side branch at right-angle branch

Ryuhei Yamaguchi, Susumu Kudo, Hideaki Amagai, Masaya Shigeta, Toshiyuki Hayase

Research output: Contribution to journalArticlepeer-review


The flow structure and the periodical oscillation in the right-angle branch have been experimentally studied in laminar steady flow using laser Doppler velocimeter. The side branch bifurcates at right angle from the trunk, and both upstream and downstream corners at the entrance of the side branch are square edge. The axial and the transverse velocity components have been primarily measured for the trunk 12.2 mm in radius and the side branch 6 mm in radius. In addition, the velocity oscillation has been measured for several radii of side branch, 4, 5, 7, 9 mm. The wall shear stress at the upstream corner takes very large magnitude. The change of wall shear stress around the upstream corner is comparable to that around the flow divider, the downstream corner. Furthermore, it has been clarified that the periodical oscillation of velocity is induced in the side branch and the Strouhal number based on the variables in the side branch is constant in terms of the Reynolds number. Therefore, this periodical oscillation in the side branch is a characteristic flow phenomenon in the right-angle branch.

Original languageEnglish
Pages (from-to)2014-2019
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number671
Publication statusPublished - 2002 Jul
Externally publishedYes


  • Biomechanics
  • Flow induced vibration
  • Laser Doppler velocimeter
  • Pipe flow
  • Right-angle branch
  • Secondary flow
  • Separation
  • Side branch

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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