1987 Fiscal Year Final Research Report Summary
Analysis and Measurement of Unsteady Flow in Curved Pipes
| Project/Area Number |
61550130
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
SUDOU Kouzou Hiroshima Univ., Faculty of Engineering, Professor, 工学部, 教授 (70016509)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAMI Toshihiro Hiroshima Univ., Faculty of Engineering, Research Associate, 工学部, 助手 (40144886)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Curved Pipe / Bend / Turbulent Flow / Oscillatory Flow / Flow Pattern / Velocity Measurement / Flow Visualization / 乱流モデル |
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| Research Abstract |
(1) Three components of mean velocity have been measured in a square sectioned 90 degree bend of radius ratio 2.0 with upstream and downstream straight ducts under Reynolds number 40000. The bias of the axial flow and the intensity of the secondary flow were investigated from the upstream of the bend to the downstream.
(2) A Reynolds stress model is applied to a fully-developed turbulent flow in a curved circular pipe. Numerical results are compared with the authors' experimental data. Computed velocity is in moderate agreement with the experimental results over the cross section.
(3) Visualization was made of the secondary flow in the fullydeveloped region of a curved pipe under oscillatory laminar flow conditions; Womersley number 5.5 to 28 and oscillatory Dean number 40 to 500. The flow pattern, the velocity profile and the vortex center of the secondary flow were made clear.
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