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The effect of droplet coalescence on drag in turbulent channel flows
https://oist.repo.nii.ac.jp/records/2295
https://oist.repo.nii.ac.jp/records/22954ac097cc-3363-464c-81c3-958448166b9a
名前 / ファイル | ライセンス | アクション |
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Cannon-2021-The effect of droplet coalescence (2.5 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 | 2021-09-21 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | The effect of droplet coalescence on drag in turbulent channel flows | |||||
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) |
Cannon, Ianto
× Cannon, Ianto× Izbassarov, Daulet× Tammisola, Outi× Brandt, Luca× Rosti, Marco E. |
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書誌情報 |
en : Physics of Fluids 巻 33, 号 8, p. 085112, 発行日 2021-08-04 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | We study the effect of droplet coalescence on turbulent wall-bounded flows by means of direct numerical simulations. In particular, the volume-of-fluid and front-tracking methods are used to simulate turbulent channel flows containing coalescing and non-coalescing droplets, respectively. We find that coalescing droplets have a negligible effect on the drag, whereas the non-coalescing ones steadily increase drag as the volume fraction of the dispersed phase increases: indeed, at 10% volume fraction, the non-coalescing droplets show a 30% increase in drag, whereas the coalescing droplets show less than 4% increase. We explain this by looking at the wall-normal location of droplets in the channel and show that non-coalescing droplets enter the viscous sublayer, generating an interfacial shear stress, which reduces the budget for viscous stress in the channel. On the other hand, coalescing droplets migrate toward the bulk of the channel forming large aggregates, which hardly affect the viscous shear stress while damping the Reynolds shear stress. We prove this by relating the mean viscous shear stress integrated in the wall-normal direction to the centerline velocity. | |||||
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/10.1063/5.0058632 | |||||
権利 | ||||||
権利情報 | © 2021 Author(s). | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://aip.scitation.org/doi/10.1063/5.0058632 | |||||
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 |