書誌事項
- タイトル別名
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- LDV Measurements of a Flow in a Strongly-Curved Elbow under a High Reynolds Number Condition(Fluids Engineering)
- 高レイノルズ数域における曲率の強いエルボ内流れのLDV計測
- コウレイノルズスウイキ ニ オケル キョクリツ ノ ツヨイ エルボ ナイ ナガレ ノ LDV ケイソク
- LDV measurements of a flow in a strongly-curved elbow under a high Reynolds number condition
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Pressure measurements, laser Doppler velocimetry (LDV) and flow visualization were carried out for a 90° elbow with a curvature that coincides with the pipe inside diameter in order to clalify the structure of a fluid fluctuation occuring in the bend. Results of pressure measurements show that the value of the pressure loss occurring in the elbow coincides with the conventional empirical formula with a turbulent boundary layer. This agreement is applicable to the case that Reynolds number is greater than 50000. Detailed results of LDV measurement for Reynolds number of 50000 is shown. Frequency analyses of axial velocities indicate that two kinds of flow fluctuations exist in the present elbow. One is the fluctuation with approximate Strohal number (based on a pipe inner diameter and a bulk velocity) of 1.0 occurring in a shear flow region. The other is with approximate Strouhal number of 0.5 occurring in the separated and its downstream regions. These fluctuations were also observed by flow visualization.
収録刊行物
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- 日本機械学会論文集B編
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日本機械学会論文集B編 76 (765), 830-838, 2010
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390282681271875072
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- NII論文ID
- 110007619442
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- NII書誌ID
- AN00187441
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- ISSN
- 18848346
- 03875016
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- NDL書誌ID
- 10716312
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 使用不可