Periodical oscillation in side branch of right angle branch in laminar steady flow

Ryuhei Yamaguchi, Yasunori Takahashi, Susumu Kudo, Toshiyuki Hayase

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Abstract

In the present study, the time variation of flow through the side branch of the right angle branch has been experimentally studied in the laminar steady flow by laser Doppler velocimeter. The side branch 14 mm in diameter bifurcates at right angle from the trunk 24.5 mm in diameter, and the shape of both upstream and downstream corners at the entrance of the side branch is square edge. The flow in the side branch periodically oscillates, and this oscillating flow is a characteristic phenomenon in the right angle branch. The Strouhal number based on the variables in the side branch is proportional to the Reynolds number. It is implied that the oscillating flow might be induced at the boundary between a small vortex formed in the reversing zone in the side branch and a large vortex in the core flow in the side branch. The rotating direction of the small vortex is the same as that of the large vortex.

Original languageEnglish
Pages (from-to)559-565
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume65
Issue number630
DOIs
Publication statusPublished - Jan 1 1999
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

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