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Effect of blockage ratio on flow of a viscoelastic wormlike micellar solution past a cylinder in a microchannel
https://oist.repo.nii.ac.jp/records/2849
https://oist.repo.nii.ac.jp/records/28494fd22a1e-3369-4958-bd9f-44616546b432
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
d2sm01162j (4.0 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2022-11-17 | |||||
| タイトル | ||||||
| タイトル | Effect of blockage ratio on flow of a viscoelastic wormlike micellar solution past a cylinder in a microchannel | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 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.× Shen, Amy Q.× Haward, Simon J. |
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| 書誌情報 |
en : Soft Matter 巻 18, 号 46, p. 8856-8866, 発行日 2022-11-14 |
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| 抄録 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | We present experiments on the flow of a viscoelastic wormlike micellar solution around cylinders (radius R) confined in straight microchannels (width W). Thirteen flow geometries are tested where the blockage ratio is varied over a wide range 0.055 ≤ BR = 2R/W ≤ 0.63. Experiments are performed at negligible Reynolds number, and for Weissenberg numbers Wi = λU/R up to 1000, where U is the average flow speed and λ is the relaxation time of the fluid. Micro-particle image velocimetry is used to characterise the flow state at each BR and Wi. In all of the geometries, a first critical Weissenberg number marks a transition from symmetric flow to an asymmetric but time-steady flow state, while a second higher critical Weissenberg number marks the onset of time-dependent flows. However, we report a clear shift in behaviour over a narrow intermediate range of 0.33 ≲ BR ≲ 0.41. Channels with BR ≤ 0.33 fall in a ‘low’ BR regime, with instabilities that originate from the downstream stagnation point, while those with BR ≥ 0.44 fall in a ‘high’ BR regime, with instabilities developing at the upstream stagnation point. Behaviour within the newly-identified intermediate BR regime is complex due to the competing influence of the two stagnation points. We summarise all our results in a flow state diagram covering Wi–BR parameter space, clearly defining the different regimes of blockage ratio for the first time. Our results contribute to the understanding of the complexities of viscoelastic flow in this benchmark geometry. | |||||
| 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/36374283 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1039/D2SM01162J | |||||
| 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/D2SM01162J | |||||
| 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 | |||||
