### Abstract

The distribution of wall shear stress and velocity in laminar steady flow has been experimentally studied in a model right-angle branch, in which the side branch bifurcates at a right-angle from the trunk. The branch model has a radius of curvature at the upstream corner and a square edge at the downstream corner. The wall shear stress was measured with an electrochemical method, and the velocity profile was measured by using laser Doppler anemometry (LDA). Near the upstream corner, along the proximal wall the wall shear stress has the form of a large-amplitude, damped sine wave. At the upstream corner, the amplitude of the wall shear stress increases markedly with decreasing the radius of curvature. The damped sinusoidal variation of wall shear stress along the proximal wall is one of the characteristic flow structures in right-angle branches. Also, the wall shear stress measured with the electrochemical method is compared with that estimated from the velocity profile measured by using LDA.

Original language | English |
---|---|

Pages (from-to) | 468-476 |

Number of pages | 9 |

Journal | JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing |

Volume | 48 |

Issue number | 4 |

DOIs | |

Publication status | Published - 2006 Jun 15 |

Externally published | Yes |

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### Keywords

- Biomechanics
- Electrochemical method
- Laminar flow
- Laser Doppler anemometry
- Pipe flow
- Right-angle branch
- Wall shear stress

### ASJC Scopus subject areas

- Industrial and Manufacturing Engineering
- Mechanical Engineering

### Cite this

*JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing*,

*48*(4), 468-476. https://doi.org/10.1299/jsmec.48.468

**Distribution of wall shear stress in right-angle branches during laminar flow.** / Fujii, Hisashi; Yamaguchi, Ryuhei; Tanishita, Kazuo.

Research output: Contribution to journal › Article

*JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing*, vol. 48, no. 4, pp. 468-476. https://doi.org/10.1299/jsmec.48.468

}

TY - JOUR

T1 - Distribution of wall shear stress in right-angle branches during laminar flow

AU - Fujii, Hisashi

AU - Yamaguchi, Ryuhei

AU - Tanishita, Kazuo

PY - 2006/6/15

Y1 - 2006/6/15

N2 - The distribution of wall shear stress and velocity in laminar steady flow has been experimentally studied in a model right-angle branch, in which the side branch bifurcates at a right-angle from the trunk. The branch model has a radius of curvature at the upstream corner and a square edge at the downstream corner. The wall shear stress was measured with an electrochemical method, and the velocity profile was measured by using laser Doppler anemometry (LDA). Near the upstream corner, along the proximal wall the wall shear stress has the form of a large-amplitude, damped sine wave. At the upstream corner, the amplitude of the wall shear stress increases markedly with decreasing the radius of curvature. The damped sinusoidal variation of wall shear stress along the proximal wall is one of the characteristic flow structures in right-angle branches. Also, the wall shear stress measured with the electrochemical method is compared with that estimated from the velocity profile measured by using LDA.

AB - The distribution of wall shear stress and velocity in laminar steady flow has been experimentally studied in a model right-angle branch, in which the side branch bifurcates at a right-angle from the trunk. The branch model has a radius of curvature at the upstream corner and a square edge at the downstream corner. The wall shear stress was measured with an electrochemical method, and the velocity profile was measured by using laser Doppler anemometry (LDA). Near the upstream corner, along the proximal wall the wall shear stress has the form of a large-amplitude, damped sine wave. At the upstream corner, the amplitude of the wall shear stress increases markedly with decreasing the radius of curvature. The damped sinusoidal variation of wall shear stress along the proximal wall is one of the characteristic flow structures in right-angle branches. Also, the wall shear stress measured with the electrochemical method is compared with that estimated from the velocity profile measured by using LDA.

KW - Biomechanics

KW - Electrochemical method

KW - Laminar flow

KW - Laser Doppler anemometry

KW - Pipe flow

KW - Right-angle branch

KW - Wall shear stress

UR - http://www.scopus.com/inward/record.url?scp=33745208005&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745208005&partnerID=8YFLogxK

U2 - 10.1299/jsmec.48.468

DO - 10.1299/jsmec.48.468

M3 - Article

AN - SCOPUS:33745208005

VL - 48

SP - 468

EP - 476

JO - JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing

JF - JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing

SN - 1344-7653

IS - 4

ER -