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FORMULA ON ENERGY LOSSES AT THREE-WAY CIRCULAR DROP MANHOLE UNDER SURCHARGE FLOW
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- ARAO Shinji
- 松江工業高等専門学校 環境・建設工学科
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- HIRATSUKA Shunsuke
- 京都大学大学院工学研究科 社会基盤工学専攻
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- KUSUDA Tetsuya
- 九州大学
Bibliographic Information
- Other Title
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- 管水路流れにおける3方向接合円形落差マンホールのエネルギー損失の定式化
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Description
Energy loss at manholes under surcharged conditions is as important as the friction loss in pipes in the design of storm sewer networks and in flood-analysis. Some researchers have already proposed the formula to calculate the energy loss at three-way manhole under surcharged conditions. However, in most of these proposed formulas all variables of structural elements for the pipes and the manhole have not been considered enough yet. Therefore, development of the formula to exactly calculate the energy loss at three-way manhole is needed. In this paper, the effect of diameter ratios between inflow pipes and an outflow pipe, the ratios of flow rates between inflow pipes, connected angles among those pipes and drop gaps between inflow pipes and outflow pipe on the energy loss at three-way circular drop manholes were investigated. Based on the experimental results, a new formula was proposed for the energy loss coefficients at the manholes that considers all structural elements and the ratios of flow rates between inflow pipes. In the proposed formula, calculated energy loss coefficients reproduce measured values more exactly than existing formulas.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 69 (2), 105-122, 2013
Japan Society of Civil Engineers
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Details 詳細情報について
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- CRID
- 1390001205352786560
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- NII Article ID
- 130004961424
- 130005121202
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- ISSN
- 2185467X
- 21875103
- http://id.crossref.org/issn/21875103
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- Abstract License Flag
- Disallowed