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TECHNICAL PAPERS

Variation of Wall Shear Stress and Periodic Oscillations Induced in the Right-Angle Branch During Laminar Steady Flow

[+] Author and Article Information
Ryuhei Yamaguchi, Hideaki Amagai

Department of Mechanical Engineering, Shibaura Institute of Technology

Takeshi Mashima

Imabari Ship Building Co., Ltd.

Hisashi Fujii

Department of Electrical System for Urban Engineering, Shibaura Institute of Technology

Toshiyuki Hayase

Institute of Fluid Science, Tohoku University

Kazuo Tanishita

Department of System Design Engineering, Keio University

J. Fluids Eng 127(5), 1013-1020 (Sep 19, 2005) (8 pages) doi:10.1115/1.1852480 History: Received March 10, 2003; Revised August 17, 2004; Online September 19, 2005
Copyright © 2005 by ASME
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References

Figures

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System schematic of right-angle branch and typical measurement sections (typical case, RS=7 mm)
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Axial velocity profile at common median plane (ReT=800,RS=7 mm). (a) QS/QT=0.25., (b) QS/QT=0.50.
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Flow visualization at common median plane (ReT=800,RS=7 mm). (a) QS/QT=0.25., (b) QS/QT=0.50.
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Flow visualization and sketch of secondary flow at cross section in side-branch (ReT=800,QS/QT=0.50,RS=7 mm)
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Distribution of wall shear stress (ReT=800,RS=7 mm). (a) QS/QT=0.25. (b) QS/QT=0.50.
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Time variation of axial velocity along tube axis (ReT=800,RS=7 mm). (a) Section T1. (b) QS/QT=0.25, section S7, (c) QS/QT=0.33, section S7, (d) QS/QT=0.50, section S7.
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Power spectrum of axial velocity along tube axis (ReT=800,RS=7 mm). (a) Section T1, (b) QS/QT=0.25, section S7, (c) QS/QT=0.33, section S7, (d) QS/QT=0.50, section S7.
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Location with periodic oscillation (ReT=800,QS/QT=0.50,RS=7 mm). The upper semicircle represents the transverse velocity contours and the lower semicircle represents the axial velocity contours. (a) section S3, (b) section S7.
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Trunk Strouhal number, StT, versus trunk Reynolds number, ReT(RS=7 mm)
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Side-branch Strouhal number, St, versus side-branch Reynolds number, Re (RS=7 mm)
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Power spectrum of axial velocity along tube axis (ReT=800,QS/QT=0.50). (a) RS=4 mm, (b) RS=5 mm, (c) RS=6 mm, (d) RS=9 mm.
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Side-branch Strouhal number, St, versus side-branch Reynolds number Re for several radii of the side-branch
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Secondary velocity vectors (upper semicircle) and axial velocity contours (lower semicircle) in section S3 in the side-branch (ReT=800,QS/QT=0.50,RS=7 mm)

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