Mechanism of periodical fluid oscillation induced by separating high shear rate flow in side branch of right-angle branch

Ryuhei Yamaguchi; Johji Shimane; Syuichi Saito; Norimichi Hiraoka; Hisashi Fujii; Toshiyuki Hayase

doi:10.1299/kikaib.72.75

Mechanism of periodical fluid oscillation induced by separating high shear rate flow in side branch of right-angle branch

Ryuhei Yamaguchi, Johji Shimane, Syuichi Saito, Norimichi Hiraoka, Hisashi Fujii, Toshiyuki Hayase

Creative Flow Research Division

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

In the previous study, it has been clarified in the right-angle branch that the periodical oscillation flow is induced in the side branch and the Strouhal number based on the variables in the side branch is independent of the Reynolds number, the flow division ratio, and the radius of the side branch. This periodical oscillation appears along the boundary between two pairs of vortices with the opposite rotation at the cross section of the side branch across the separation flow. In the present study, another source of the periodical oscillation is experimentally clarified that the high shear rate flow is induced along the separation shearing layer between the separation flow of low velocity and the main flow with high velocity along the distal wall in the side branch since the high shear rate along this separation shearing layer is several times as large as that in the upstream trunk or in the downstream region of the side branch.

Original language	English
Pages (from-to)	75-80
Number of pages	6
Journal	Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume	72
Issue number	1
DOIs	https://doi.org/10.1299/kikaib.72.75
Publication status	Published - 2006 Jan

Keywords

Biomechanics
Flow Induced Vibration
LDA
PIV
Pipe Flow
Right-Angle Branch
Secondary Flow
Separation

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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Mechanism of periodical fluid oscillation induced by separating high shear rate flow in side branch of right-angle branch. / Yamaguchi, Ryuhei; Shimane, Johji; Saito, Syuichi; Hiraoka, Norimichi; Fujii, Hisashi; Hayase, Toshiyuki.

In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 72, No. 1, 01.2006, p. 75-80.

Research output: Contribution to journal › Article › peer-review

Yamaguchi, Ryuhei ; Shimane, Johji ; Saito, Syuichi ; Hiraoka, Norimichi ; Fujii, Hisashi ; Hayase, Toshiyuki. / Mechanism of periodical fluid oscillation induced by separating high shear rate flow in side branch of right-angle branch. In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B. 2006 ; Vol. 72, No. 1. pp. 75-80.

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abstract = "In the previous study, it has been clarified in the right-angle branch that the periodical oscillation flow is induced in the side branch and the Strouhal number based on the variables in the side branch is independent of the Reynolds number, the flow division ratio, and the radius of the side branch. This periodical oscillation appears along the boundary between two pairs of vortices with the opposite rotation at the cross section of the side branch across the separation flow. In the present study, another source of the periodical oscillation is experimentally clarified that the high shear rate flow is induced along the separation shearing layer between the separation flow of low velocity and the main flow with high velocity along the distal wall in the side branch since the high shear rate along this separation shearing layer is several times as large as that in the upstream trunk or in the downstream region of the side branch.",

keywords = "Biomechanics, Flow Induced Vibration, LDA, PIV, Pipe Flow, Right-Angle Branch, Secondary Flow, Separation",

author = "Ryuhei Yamaguchi and Johji Shimane and Syuichi Saito and Norimichi Hiraoka and Hisashi Fujii and Toshiyuki Hayase",

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AU - Shimane, Johji

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