正方形断面管路内乱流におけるストリーク構造　流れの可視化および流速測定による同定

• 河原 源太

• 鮎川 恭三

• 越智 順治

• 渡部 哲也

書誌事項

タイトル別名

• Streaky Structures in a Turbulent Square-Duct Flow. Identification of Streaky Structures by Combined Flow Visualization-Velocity Measurement Techniques.
• セイホウケイ ダンメン カンロナイ ランリュウ ニ オケル ストリーク コウゾ

抄録

Streaky structures have been studied in a fully developed turbulent square-duct flow by using combined dye flow visualization-LDV velocity measurement techniques. Transverse distributions of low-speed streaks and mean streak spacing are shown in the near-wall region, i.e., yu_τ/v < 25. At z/H < 0.16, the transverse distribution of the low-speed streaks is homogeneous and their spacing is about 90v/u_τ, which suggests that the streaky structures near the wall bisector may be similar to those in turbulent boundary layers. In addition, the transverse distance between the visually identified low-speed streak and the velocity-measurement point was measured for each set of visual data. Conditioning the velocity fluctuations on this transverse distance, conditional probability density distributions of the axial, wall-normal and spanwise velocity fluctuations are shown. These distributions suggest the existence of quasi-streamwise vortical motions associated with the visualized streaky structures, their wall-normal dimension and the intermittency of their appearance.

収録刊行物

• 日本機械学会論文集Ｂ編

  日本機械学会論文集Ｂ編 59 (558), 397-402, 1993

  一般社団法人 日本機械学会

キーワード

• Square Duct

詳細情報

• CRID: 1390001205894756224
• NII論文ID: 130004220621
• NII論文ID: 110002391615
• NII書誌ID: AN00187441
• DOI: 10.1299/kikaib.59.397
• ISSN: 18848346
• ISSN: 03875016
• NDL書誌ID: 3804262
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3804262
• Web Site: http://www.jstage.jst.go.jp/article/kikaib1979/59/558/59_558_397/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可