書誌事項
- タイトル別名
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- Breaking Wave and Bubble Generation by a Two-Dimensional Body Moving Beneath an Air-Water Interface(Fluids Engineering)
- 水面下を等速運動する柱状物体による砕波と気泡生成
- スイメン カ オ トウソク ウンドウ スル チュウジョウ ブッタイ ニ ヨル サイハ ト キホウ セイセイ
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抄録
We have conducted laboratory experiments on air-bubble generation by a submerged two-dimensional body moving at a constant velocity U_0 in order to understand the fundamental flow physics of marine constructions such as pipe lines close to the air-water interface. Measurements of the free surface profile and visualization of the air bubbles yield the threshold and the regime diagrams of the bubble generation, which are described by cross-sectional shape of the cylinders, Reynolds number (Re_d=U_0d/ν, where d and ν are the vertical thickness of the cylinders and kinematic viscosity of the water, respectively), Froude number (Fr_h=U_0/(gh)^<1/2>, where h is the depth of the cylinders), and normalized depth of the cylinder (a=h/d). For circular cylinders, as Re_d and Fr_h numbers increase, the surface deformation becomes substantial in the downstream of the cylinder and breaking wave with air entrainment occurs. The bubble generation by the breaking wave is also observed in the case of the elliptic cylinder although the condition of the bubble generation in the Re_d-Fr_h regime diagram is different from that observed in the case of the circular cylinder. In any cases of the cylinders, the ratio of the wave height to the wave length, which should be the physical criterion of the breaking wave with bubble generation, is about 0.1.
収録刊行物
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- 日本機械学会論文集B編
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日本機械学会論文集B編 76 (772), 2152-2159, 2010
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390001206294869888
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- NII論文ID
- 110008006801
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- NII書誌ID
- AN00187441
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- ISSN
- 18848346
- 03875016
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- NDL書誌ID
- 10955166
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可