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At a second critical value Wic2 approximately 130, the flow becomes time-dependent, with a characteristic frequency f0 approximately 1/lambdaM. This initial transition to time dependence has characteristics of a subcritical Hopf bifurcation. Power spectra of the measured fluctuations become complex as Wi is increased further, showing a gradual slowing down of the dynamics and emergence of harmonics. A final transition at very high Wic3 corresponds to the re-emergence of a single peak in the power spectrum but at much higher frequency. 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Flow of wormlike micellar solutions around microfluidic cylinders with high aspect ratio and low blockage ratio
https://oist.repo.nii.ac.jp/records/983
https://oist.repo.nii.ac.jp/records/983222a4d2c-fcd1-4468-96f3-72fe7de80a66
名前 / ファイル | ライセンス | アクション |
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Haward-2019-Flow of wormlike micellar solution (4.9 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-07-04 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Flow of wormlike micellar solutions around microfluidic cylinders with high aspect ratio and low blockage ratio | |||||
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) |
Haward, Simon J.
× Haward, Simon J.× Kitajima, Naoyuki× Toda-Peters, Kazumi× Takahashi, Tsutomu× Shen, Amy Q. |
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書誌情報 |
en : Soft Matter 巻 15, 号 9, p. 1927-1941, 発行日 2019-01-18 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | We employ time-resolved flow velocimetry and birefringence imaging methods to study the flow of a well-characterized shear-banding wormlike micellar solution around a novel glass-fabricated microfluidic circular cylinder. In contrast with typical microfluidic cylinders, our geometry is characterized by a high aspect ratio alpha = H/W = 5 and a low blockage ratio beta = 2r/W = 0.1, where H and W are the channel height and width, and the cylinder radius r = 20 mum. The small cylinder radius allows access up to very high Weissenberg numbers 1.9 </= Wi = lambdaMU/r </= 3750 (where lambdaM is the Maxwell relaxation time) while inertial effects remain entirely negligible (Reynolds number, Re < 10-4). At low Wi values, the flow remains steady and symmetric and a birefringent region (indicating micellar alignment and tensile stress) develops downstream of the cylinder. Above a critical value Wic approximately 60 the flow transitions to a steady asymmetric state, characterized as a supercritical pitchfork bifurcation, in which the fluid takes a preferential path around one side of the cylinder. At a second critical value Wic2 approximately 130, the flow becomes time-dependent, with a characteristic frequency f0 approximately 1/lambdaM. This initial transition to time dependence has characteristics of a subcritical Hopf bifurcation. Power spectra of the measured fluctuations become complex as Wi is increased further, showing a gradual slowing down of the dynamics and emergence of harmonics. A final transition at very high Wic3 corresponds to the re-emergence of a single peak in the power spectrum but at much higher frequency. We discuss this in terms of possible flow-induced breakage of micelles into shorter species with a faster relaxation time. | |||||
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/30657156 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1039/C8SM02099J | |||||
権利 | ||||||
権利情報 | © 2019 The Royal Society of Chemistry. | |||||
情報源 | ||||||
関連名称 | https://creativecommons.org/licenses/by/3.0/ | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://pubs.rsc.org/en/content/articlelanding/2019/sm/c8sm02099j#!divAbstract | |||||
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 |