Flow in a Pipe Fitting : Part 3-Flow Mechanism in a Pipe Fitting with Branching Angle of 45-deg. in Laminar Flow
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- SUU Tetsuo
- Faculty of Education, Shinshu University
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- FUJII Kiyomi
- Belonged to Oyama Vocational Training College before
Bibliographic Information
- Other Title
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- 割込み型分岐管内の流れ : 第3報-分岐角度が45°で層流の場合における流動機構
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Abstract
In order to investigate the shape of a pipe fitting with small energy loss, the flow mechanism in a pipe fitting with branching angle θ_p of 45°and with the sharp edged lateral entrance was studied theoretically and experimentally for laminar flow. The area ratio m was chosen to be equal to 2.0, 3.0 and 4.0. The ratio of lateral discharge to total discharge Q_2/Q_1 was regulated at several values between 0.0 and 1.0. In the experiment, the Reynolds number defined at the upstream section of the main conduit R_<e1> covered a range between 500 and 2000. The conclusions can be summarized as follows: 1) To study the flow mechanism in a pipe fitting the flow was analyzed by the free-streamline theory. The coefficient of contraction in the lateral conduit C_c for θ_p of 45° is greater than that of 90° when m and Q_2/Q_1 are the same values. The streamline was calculated. 2) The separation point on the wall of the main conduit was analyzed by the methods according to Prandtl and Tani for Laminar flow. 3) The flow field in the real pipe fitting with rectangular cross section was studied by the flow visualization technique. The secondary flow occurs in the lateral conduit and the downstream section of the main conduit. The separations of flow occur from the upstream corner of the lateral entrance and on the wall of the main conduit. The separation point on the wall of the main conduit is characterized by such parameters as m, R_<e1>, Q_2/Q_1 and l_<1d>/h_1 where l_<1d> and h_1 are the length and the width of the upstream section of the main conduit, respectively. 4) The results obtained by the theoretical analysis and experiment coincide fairly well.
Journal
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- Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan
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Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 20 (58), 91-101, 1995
The Society of Heating, Air-Conditioning & Sanitary Engineers of Japan
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Details 詳細情報について
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- CRID
- 1390282681523038208
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- NII Article ID
- 110007998485
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- NII Book ID
- AN00065706
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- ISSN
- 24240486
- 0385275X
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- Text Lang
- ja
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed