Bubble Generation by a Cylinder Moving Beneath a Free Surface
Wave breaking and air bubble generation by a 2-D cylinder moving beneath a free surface were experimentally investigated. Measurements of the free surface profile and visualization of the air bubbles yield the threshold and the regime diagrams of the bubble generation, which depend on the cross-sect...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2011-08-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/6/6/6_6_851/_pdf/-char/en |
| _version_ | 1818942650219233280 |
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| author | Ichiro KUMAGAI Yuichi MURAI Yuji TASAKA Naoya NAKAMURA |
| author_facet | Ichiro KUMAGAI Yuichi MURAI Yuji TASAKA Naoya NAKAMURA |
| author_sort | Ichiro KUMAGAI |
| collection | DOAJ |
| description | Wave breaking and air bubble generation by a 2-D cylinder moving beneath a free surface were experimentally investigated. Measurements of the free surface profile and visualization of the air bubbles yield the threshold and the regime diagrams of the bubble generation, which depend on the cross-sectional shape of the cylinder, Reynolds number, effective Froude number, normalized depth of the cylinder and angle of attack. As the Reynolds and Froude numbers increase, the surface deformation becomes substantial in the downstream of the cylinder. A breaking wave with air entrainment occurs when the ratio of the wave height to the wave length is greater than ∼0.1. Our results provide useful information for design of facilities such as marine constructions and a hydrofoil air pump for drag reduction of ships. |
| first_indexed | 2024-12-20T07:14:48Z |
| format | Article |
| id | doaj.art-45840ca912a7464e86bb96e7df0cbcc6 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-20T07:14:48Z |
| publishDate | 2011-08-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-45840ca912a7464e86bb96e7df0cbcc62022-12-21T19:48:49ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582011-08-016685185910.1299/jfst.6.851jfstBubble Generation by a Cylinder Moving Beneath a Free SurfaceIchiro KUMAGAI0Yuichi MURAI1Yuji TASAKA2Naoya NAKAMURA3Faculty of Engineering, Hokkaido UniversityFaculty of Engineering, Hokkaido UniversityFaculty of Engineering, Hokkaido UniversityATOX Co., Ltd.Wave breaking and air bubble generation by a 2-D cylinder moving beneath a free surface were experimentally investigated. Measurements of the free surface profile and visualization of the air bubbles yield the threshold and the regime diagrams of the bubble generation, which depend on the cross-sectional shape of the cylinder, Reynolds number, effective Froude number, normalized depth of the cylinder and angle of attack. As the Reynolds and Froude numbers increase, the surface deformation becomes substantial in the downstream of the cylinder. A breaking wave with air entrainment occurs when the ratio of the wave height to the wave length is greater than ∼0.1. Our results provide useful information for design of facilities such as marine constructions and a hydrofoil air pump for drag reduction of ships.https://www.jstage.jst.go.jp/article/jfst/6/6/6_6_851/_pdf/-char/enmulti-phase flowwavebubblecylinderbreaking waveair-water interface |
| spellingShingle | Ichiro KUMAGAI Yuichi MURAI Yuji TASAKA Naoya NAKAMURA Bubble Generation by a Cylinder Moving Beneath a Free Surface Journal of Fluid Science and Technology multi-phase flow wave bubble cylinder breaking wave air-water interface |
| title | Bubble Generation by a Cylinder Moving Beneath a Free Surface |
| title_full | Bubble Generation by a Cylinder Moving Beneath a Free Surface |
| title_fullStr | Bubble Generation by a Cylinder Moving Beneath a Free Surface |
| title_full_unstemmed | Bubble Generation by a Cylinder Moving Beneath a Free Surface |
| title_short | Bubble Generation by a Cylinder Moving Beneath a Free Surface |
| title_sort | bubble generation by a cylinder moving beneath a free surface |
| topic | multi-phase flow wave bubble cylinder breaking wave air-water interface |
| url | https://www.jstage.jst.go.jp/article/jfst/6/6/6_6_851/_pdf/-char/en |
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