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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Effect of large-scale structures on wall shear stress fluctuations in pipe flow

http://hdl.handle.net/2237/00033486
ccfd3514-d312-4b0e-a077-ae293e039c56
名前 / ファイル ライセンス アクション
PhysRevFluids_5_104601.pdf PhysRevFluids_5_104601 (3.4 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2021-02-08
タイトル
タイトル Effect of large-scale structures on wall shear stress fluctuations in pipe flow
著者 Tong, Tong

× Tong, Tong

WEKO 103264

Tong, Tong

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Bhatt, Kovid

× Bhatt, Kovid

WEKO 103265

Bhatt, Kovid

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Tsuneyoshi, Tatsuya

× Tsuneyoshi, Tatsuya

WEKO 103266

Tsuneyoshi, Tatsuya

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Tsuji, Yoshiyuki

× Tsuji, Yoshiyuki

WEKO 103267

Tsuji, Yoshiyuki

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権利
権利情報 © 2020 American Physical Society
抄録
内容記述 In this paper, particle image velocimetry and electrochemical measurements were applied simultaneously to examine the relationship between wall shear stress and the three-component velocity field in pipe flow. Moreover, the large-scale motions in the velocity field were separated into very-large-scale motions (VLSMs) and large-scale motions (LSMs) to investigate their respective influences on the wall shear stress fluctuations. The conditional velocity field during negative wall shear stress fluctuations confirmed the existence of the “footprints” of the streamwise and wall-normal velocity components in VLSMs. Further, a pair of counter-rotating roll modes was found to appear in the VLSMs, exhibiting length scales of λx>3R, where λx is the streamwise wavelength and R is the pipe radius. In contrast, in LSMs, which exhibit length scales of 0.6R<λx<3R, counter-rotating vortex pairs were not observed. In this paper, the length-scale threshold for generating counter-rotating vortex pairs in pipe flow was found to be 3R. This threshold value is higher than the value reported for turbulent boundary layers, which is 1δ, where δ is the boundary-layer thickness. Two-point correlations of wall shear stress, which are associated with the conditional spanwise velocity in the θ−x plane, revealed the effect of spanwise meandering features on the near-wall region.
内容記述タイプ Abstract
出版者
出版者 American Physical Society
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
DOI
関連識別子
識別子タイプ DOI
関連識別子 https://doi.org/10.1103/PhysRevFluids.5.104601
ISSN(Online)
収録物識別子タイプ ISSN
収録物識別子 2469-990X
書誌情報 Physical Review Fluids

巻 5, 号 10, p. 104601, 発行日 2020-10
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