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Upstream wall vortices in viscoelastic flow past a cylinder
https://oist.repo.nii.ac.jp/records/2672
https://oist.repo.nii.ac.jp/records/267293053fb4-94d0-4658-be48-6410f709fc47
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Hopkins-Upstream wall vortices in viscoelastic (7.4 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2022-07-04 | |||||
| タイトル | ||||||
| タイトル | Upstream wall vortices in viscoelastic flow past a cylinder | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | wormlike micellar-solutions | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | elastic instabilities | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | numerical-simulation | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | surfactant solutions | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | living polymers | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | dynamics | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | model | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | fluid | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者（英） |
Hopkins, Cameron C.
× Hopkins, Cameron C.× Haward, Simon J.× Shen, Amy Q. |
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| 書誌情報 |
en : Soft Matter 発行日 2022-06-13 |
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| 抄録 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | We report a novel inertia-less, elastic flow instability for a viscoelastic, shear-thinning wormlike micellar solution flowing past a microcylinder in a channel with blockage ratio BR = 2R/W = 0.5 and aspect ratio α = H/W ≈ 5, where R ≈ 100 μm is the cylinder radius, W is the channel width, and H is the channel height. The instability manifests upstream of the cylinder and changes form with increasing Weissenberg number over the range 0.5 ≲ Wi = Uλ/R ≲ 900, where U is the average flow velocity and λ is the terminal relaxation time of the fluid. Beyond a first critical Wi, the instability begins as a bending of the streamlines near the upstream pole of the cylinder that breaks the symmetry of the flow. Beyond a second critical Wi, small, time-steady, and approximately symmetric wall-attached vortices form upstream of the cylinder. Beyond a third critical Wi, the flow becomes time dependent and pulses with a characteristic frequency commensurate with the breakage timescale of the wormlike micelles. This is accompanied by a breaking of the symmetry of the wall-attached vortices, where one vortex becomes considerably larger than the other. Finally, beyond a fourth critical Wi, a vortex forms attached to the upstream pole of the cylinder whose length fluctuates in time. The flow is highly time dependent, and the cylinder-attached vortex and wall-attached vortices compete dynamically for space and time in the channel. Our results add to the rapidly growing understanding of viscoelastic flow instabilities in microfluidic geometries. | |||||
| 出版者 | ||||||
| 出版者 | Royal Society of Chemistry | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1744-683X | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1744-6848 | |||||
| PubMed番号 | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | PMID | |||||
| 関連識別子 | info:pmid/35730936 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1039/D2SM00418F | |||||
| 権利 | ||||||
| 権利情報 | © 2022 The Author(s) | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://pubs.rsc.org/en/content/articlelanding/2022/SM/D2SM00418F | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
