| 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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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1987: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1986: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Curved Pipe / Bend / Turbulent Flow / Oscillatory Flow / Flow Pattern / Velocity Measurement / Flow Visualization / 乱流モデル / 流体力学 / 曲り管内流れ / 流れの可視化 |
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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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