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Asymmetric flows of complex fluids past confined cylinders: A comprehensive numerical study with experimental validation
https://oist.repo.nii.ac.jp/records/1605
https://oist.repo.nii.ac.jp/records/16052f49fa58-20b0-4e1c-836a-4cc241fd4974
名前 / ファイル | ライセンス | アクション |
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Varchanis-2020-Asymmetric flows of complex flu (13.7 MB)
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Creative Commons Attribution 4.0 International(https://creativecommons.org/licenses/by/4.0/)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2020-07-07 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Asymmetric flows of complex fluids past confined cylinders: A comprehensive numerical study with experimental validation | |||||
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) |
Varchanis, Stylianos
× Varchanis, Stylianos× Hopkins, Cameron C.× Shen, Amy Q.× Tsamopoulos, John× Haward, Simon J. |
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書誌情報 |
en : Physics of Fluids 巻 32, 号 5, p. 053103, 発行日 2020-05-08 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Three non-Newtonian constitutive models are employed to investigate how fluid rheological properties influence the development of laterally asymmetric flows past confined cylinders. First, simulations with the shear-thinning but inelastic Carreau-Yasuda model are compared against complementary flow velocimetry experiments on a semidilute xanthan gum solution, showing that shear-thinning alone is insufficient to cause flow asymmetry. Next, simulations with an elastic but non-shear-thinning finitely extensible non-linear elastic dumbbell model are compared with experiments on a constant viscosity solution of poly(ethylene oxide) (PEO) in an aqueous glycerol mixture. The simulations and the experiments reveal the development of an extended downstream wake due to elastic stresses generated at the stagnation point but show no significant lateral asymmetries of the flow around the sides of the cylinder. Finally, the elastic and shear-thinning linear Phan-Thien-Tanner (l-PTT) model is compared with experimental velocimetry on a rheologically similar solution of PEO in water. Here, at low flow rates, lateral symmetry is retained, while the growth of a downstream elastic wake is observed, in qualitative similarity to the non-shear-thinning elastic fluids. However, above a critical flow rate, the flow bifurcates to one of the two stable and steady laterally asymmetric states. Further parameter studies with the l-PTT model are performed by varying the degrees of shear-thinning and elasticity and also modifying the confinement of the cylinder. These tests confirm the importance of the coupling between shear-thinning and elasticity for the onset of asymmetric flows and also establish stability and bifurcation diagrams delineating the stable and unstable flow states. | |||||
出版者 | ||||||
出版者 | AIP Publishing | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1070-6631 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1089-7666 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1063/5.0008783 | |||||
権利 | ||||||
権利情報 | © 2020 Author(s) | |||||
情報源 | ||||||
関連名称 | https://creativecommons.org/licenses/by/4.0/ | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://aip.scitation.org/doi/10.1063/5.0008783 | |||||
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 |