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“Phase diagram” for viscoelastic Poiseuille flow over a wavy surface
https://oist.repo.nii.ac.jp/records/922
https://oist.repo.nii.ac.jp/records/922ff6760a4-32d2-484e-a3d9-8619f20c4694
名前 / ファイル | ライセンス | アクション |
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Haward-2018-_Phase diagram_ for viscoelastic P (9.8 MB)
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Creative Commons
Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/) |
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-06-07 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | “Phase diagram” for viscoelastic Poiseuille flow over a wavy surface | |||||
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.× Page, Jacob× Zaki, Tamer A.× Shen, Amy Q. |
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書誌情報 |
en : Physics of Fluids 巻 30, 号 11, p. 113101, 発行日 2018-11-05 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | We experimentally examine the Poiseuille flow of viscoelastic fluids over wavy surfaces. Five precision microfabricated flow channels are utilized, each of depth 2d = 400 mu m, spanwise width omega = 10d and with a sinusoidal undulation of amplitude A = d/20 on one of the spanwise walls. The undulation wavelength lambda is varied between each of the channels, providing dimensionless channel depths alpha in the range 0.2 pi <= alpha= 2 pi d/lambda <= 3.2 pi. Nine viscoelastic polymer solutions are formulated, spanning more than four orders in elasticity number El and are tested in the wavy channels over a wide range of Reynolds and Weissenberg numbers. Flow velocimetry is used to observe and measure the resulting flow patterns. Perturbations to the Poiseuille base flow caused by the wavy surfaces are quantified by the depth of their penetration P into the flow domain. Consistent with theoretical predictions made for wavy plane-Couette flow [J. Page and T. A. Zaki, "Viscoelastic shear flow over a wavy surface," J. Fluid Mech. 801, 392-429 (2016)], we observe three distinct flow regimes ("shallow elastic," "deep elastic" and "transcritical") that can be assembled into a "phase diagram" spanned by two dimensionless parameters: alpha and the depth of the theoretically predicted critical layer Sigma similar to root El. Our results provide the first experimental verification of this phase diagram and thus constitute strong evidence for the existence of the predicted critical layer. In the inertio-elastic transcritical regime, a surprising amplification of the perturbation occurs at the critical layer, strongly influencing P. These effects are of likely importance in widespread inertio-elastic flows in pipes and channels, such as in polymer turbulent drag reduction. | |||||
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/10.1063/1.5057392 | |||||
権利 | ||||||
権利情報 | © 2018 The 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/10.1063/1.5057392 | |||||
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 |