Flow Pattern and Wall Shear Stress through Unsymmetrical Branch in Steady Flow

Ryuhei Yamaguchi, Noriyasu Yano, Takami Yamaguchi

Research output: Contribution to journalArticlepeer-review


The wall shear stress and the flow pattern in a 45 degree unsymmetrical branch model in steady flow have been studied experimentally. The model, made of Plexiglas, consists of the parent tube (D0 = 24 mm) and the daughter tube (D1 = 14 mm). The curvature of the outer wall in the daughter tube and of the flow divider was RD = 3.5D0 and Rc = D0/8, respectively. The wall shear stress was measured using an electrochemical method at the Reynolds number of 500, 800 and 1200, and the flow pattern was visualized by dye injection. Approximately 150 electrodes were embedded in the median plane of a branch tube. The ratio of the flow rate in the daughter tube to the total flow rate in the upstream parent tube is about 0.25, which corresponds to the ratio of the cross-sectional area downstream. The flow through this branch was characterized at the outer wall of the daughter tube, at the outer wall of the parent tube and near the flow divider. In particular, at the outer wall of the daughter tube, flow separation did not occur although the helical flow appeared.

Original languageEnglish
Pages (from-to)2203-2208
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number539
Publication statusPublished - 1991


  • Atherosclerosis
  • Biological Engineering
  • Flow Visualization
  • Pipe Flow
  • Swirling Flow
  • Unsymmetrical Branch
  • Wall Shear Stress

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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