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Characteristics of shear stress fluctuations in polymer solutions and their relation to turbulent structures in channel flows
http://hdl.handle.net/2237/0002011901
http://hdl.handle.net/2237/00020119018b532899-14a1-4e39-acfe-dfedd3e9ce08
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
105153_1_5_0230123-1.pdf (3.3 MB)
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| アイテムタイプ | itemtype_ver1(1) | |||||||||
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| 公開日 | 2025-01-22 | |||||||||
| タイトル | ||||||||||
| タイトル | Characteristics of shear stress fluctuations in polymer solutions and their relation to turbulent structures in channel flows | |||||||||
| 言語 | en | |||||||||
| 著者 |
Wang, Yu
× Wang, Yu
× Tsuji, Yoshiyuki
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| アクセス権 | ||||||||||
| アクセス権 | open access | |||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||
| 権利 | ||||||||||
| 権利情報 | Copyright 2024 Author(s). Published under an exclusive license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in (Physics of Fluids 36, 105153 (2024)) and may be found at (https://doi.org/10.1063/5.0230123). | |||||||||
| 言語 | en | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | In this study, the wall shear stress in the channel flow of polyacrylamide polymers was investigated through electrochemical experiments, and the effects of the polymer concentration were evaluated at different Reynolds numbers. The objective was to explore the relationship between the changes in the drag reduction and near-wall turbulence structure induced by the polymer. The experiments were conducted using polymer concentrations of 0, 20, 50, 100, and 150 ppm, and a drag reduction of approximately 23% was achieved at a bulk Reynolds number of Reb = 18 750. In the electrochemical method, the working electrode was arranged spanwise, and simultaneous measurements were performed for eight electrodes to discuss the scale of the near-wall low-speed streaks and burst events. A comprehensive analysis of the correlation of the wall shear stress in the streamwise direction and the cross-spectrum of two points in the spanwise direction revealed that large streamwise and spanwise scales of near-wall low-speed streaks were generated at high polymer concentrations. Furthermore, the results obtained using the variable interval time averaging technique indicated that polymer incorporation suppressed the wall shear stress fluctuations and weakened both the intensity and frequency of the bursting events. | |||||||||
| 言語 | en | |||||||||
| 出版者 | ||||||||||
| 出版者 | AIP Publishing | |||||||||
| 言語 | en | |||||||||
| 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 | |||||||||
| 出版タイプ | ||||||||||
| 出版タイプ | VoR | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
| 関連情報 | ||||||||||
| 関連タイプ | isVersionOf | |||||||||
| 識別子タイプ | DOI | |||||||||
| 関連識別子 | https://doi.org/10.1063/5.0230123 | |||||||||
| 収録物識別子 | ||||||||||
| 収録物識別子タイプ | PISSN | |||||||||
| 収録物識別子 | 1070-6631 | |||||||||
| 書誌情報 |
en : Physics of Fluids 巻 36, 号 10, p. 105153, 発行日 2024-10 |
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| ファイル公開日 | ||||||||||
| 日付 | 2025-10-01 | |||||||||
| 日付タイプ | Available | |||||||||
