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Extraction of 3D vortex structures from a turbulent puff in a pipe using two-color illumination and flakes

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タイトル: Extraction of 3D vortex structures from a turbulent puff in a pipe using two-color illumination and flakes
著者: Ohkubo, Jumpei 著作を一覧する
Tasaka, Yuji 著作を一覧する
Park, Hyun Jin 著作を一覧する
Murai, Yuichi 著作を一覧する
キーワード: Pipe flow
Turbulence transition
Flow visualization
Flake
発行日: 2016年11月
出版者: Springer
誌名: Journal of visualization
巻: 19
号: 4
開始ページ: 643
終了ページ: 651
出版社 DOI: 10.1007/s12650-016-0344-z
抄録: A novel visualization technique was proposed to extract the three-dimensional vortex structure of a turbulent puff, which is a local turbulence event that is observed in pipe flows at relatively low Reynolds numbers. The technique is based on multi-color illumination of microscopic flakes that are suspended in the flow, which makes structural visualization more informative than conventional monochrome approaches. A special optical arrangement of two laser sheets, colored green and blue, was established for the circular pipe. Based on an image analysis sequence, the internal structure of the puff is reconstructed as a cross-sectional temporal 3D image consisting of voxels with unicolor degrees between green and blue, where an individual single vortex is extracted as a pair of two-color stripes. This allows quantification of the azimuthal wavenumber of the vortical structure that characterizes the puff. The wavenumber results agreed well with the results of previous studies, thus supporting the applicability of the proposed visualization technique. .
Rights: The original publication is available at www.springerlink.com
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/67494
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 田坂 裕司

 

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