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力学的境界条件下における境界層での自己相似性:垂直石鹸膜に引き起こされる空気の流れ
https://doi.org/10.15102/1394.00002652
https://doi.org/10.15102/1394.000026520c8117ab-b618-42b8-809b-46be205ab1bd
名前 / ファイル | ライセンス | アクション |
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Download is available from 2025/4/2.
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Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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公開日 | 2023-05-17 | |||||||
タイトル | ||||||||
言語 | ja | |||||||
タイトル | 力学的境界条件下における境界層での自己相似性:垂直石鹸膜に引き起こされる空気の流れ | |||||||
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言語 | en | |||||||
タイトル | Self-similarity in a Boundary-layer Flow over a Dynamic Boundary: Flow of Air Induced by a Falling Soap Film | |||||||
言語 | ||||||||
言語 | eng | |||||||
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資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
資源タイプ | doctoral thesis | |||||||
ID登録 | ||||||||
ID登録 | 10.15102/1394.00002652 | |||||||
ID登録タイプ | JaLC | |||||||
アクセス権 | ||||||||
アクセス権 | open access | |||||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
著者 |
服部 優菜
× 服部 優菜
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著者 (英) |
Yuna, Hattori
× Yuna, Hattori
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抄録 | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | A wide range of dynamical phenomena in nature are self-similar. This remarkable property entails that scaled versions of a phenomenon conform onto themselves. It not only affords simplified mathematical analysis but also reveals the physical underpinnings of the phenomenon. In fluid flows, a textbook example of such phenomena is the boundary-layer flow over a rigid boundary---the Blasius boundary layer flow. In this thesis, we experimentally and theoretically study self-similarity in boundary-layer flow over a dynamic boundary, wherein the flow and the boundary are dynamically coupled. Our experimental setup is a soap-film channel, which is essentially a soapy waterfall---a planar film of soap-water solution falling under gravity. This setup has long been used to study quasi-two-dimensional flows in a laboratory setting. Unlike previous experiments, however, where the focus is on the flow in the film, we train attention on what surrounds the film: air. The falling film drags the surrounding air, inducing flow in a thin layer of air adjacent to the film. This flowing air, in turn, resists the motion of the falling film; thus, the film-air interface is a dynamic boundary. We measure the velocity profile of the airflow in the boundary-layer of this interface using super-resolution Particle Image Velocimetry. (To our knowledge, these are the first experiments to measure airflow induced by a soap film.) The downstream evolution of the air velocity profile manifests self-similarity, which we analyze using the framework of boundary-layer theory. Surprisingly, we find that the conditions of self-similarity of the airflow also shed light on the downstream evolution of the film. Beyond air-film interaction, our findings may bear on a broader class of flows over dynamic boundaries, e.g. ocean-air interaction. | |||||||
言語 | en | |||||||
口頭試問日 | ||||||||
2023-02-21 | ||||||||
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学位授与年月日 | 2023-03-31 | |||||||
学位名 | ||||||||
学位名 | Doctor of Philosophy | |||||||
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学位授与番号 | 甲第119号 | |||||||
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学位授与機関識別子Scheme | kakenhi | |||||||
学位授与機関識別子 | 38005 | |||||||
学位授与機関名 | Okinawa Institute of Science and Technology Graduate University | |||||||
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出版タイプ | VoR | |||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
権利 | ||||||||
権利情報 | © 2023 The Author. |