A theoretical prediction of friction drag reduction in turbulent flow by superhydrophobic surfaces

Koji Fukagata; Nobuhide Kasagi; Petros Koumoutsakos

doi:10.1063/1.2205307

A theoretical prediction of friction drag reduction in turbulent flow by superhydrophobic surfaces

Koji Fukagata, Nobuhide Kasagi, Petros Koumoutsakos

研究成果: Article › 査読

198 被引用数 (Scopus)

抄録

We present a theoretical prediction for the drag reduction rate achieved by superhydrophobic surfaces in a turbulent channel flow. The predicted drag reduction rate is in good agreement with results obtained from direct numerical simulations at Re_τ ≃ 180 and 400. The present theory suggests that large drag reduction is possible also at Reynolds numbers of practical interest (Re_τ ∼10⁵-10⁶ by employing a hydrophobic surface, which induces a slip length on the order of ten wall units or more.

本文言語	English
論文番号	051703
ジャーナル	Physics of Fluids
巻	18
号	5
DOI	https://doi.org/10.1063/1.2205307
出版ステータス	Published - 2006 5月
外部発表	はい

ASJC Scopus subject areas

計算力学
凝縮系物理学
材料力学
機械工学
流体および伝熱

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10.1063/1.2205307

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abstract = "We present a theoretical prediction for the drag reduction rate achieved by superhydrophobic surfaces in a turbulent channel flow. The predicted drag reduction rate is in good agreement with results obtained from direct numerical simulations at Reτ ≃ 180 and 400. The present theory suggests that large drag reduction is possible also at Reynolds numbers of practical interest (Reτ ∼105-106 by employing a hydrophobic surface, which induces a slip length on the order of ten wall units or more.",

author = "Koji Fukagata and Nobuhide Kasagi and Petros Koumoutsakos",

note = "Funding Information: This work was supported through the 21st Century COE Program, “Mechanical Systems Innovation,” by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT). P.K. wishes to gratefully acknowledge the support of the 21st Century COE Program during his sabbatical at the University of Tokyo.",

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N2 - We present a theoretical prediction for the drag reduction rate achieved by superhydrophobic surfaces in a turbulent channel flow. The predicted drag reduction rate is in good agreement with results obtained from direct numerical simulations at Reτ ≃ 180 and 400. The present theory suggests that large drag reduction is possible also at Reynolds numbers of practical interest (Reτ ∼105-106 by employing a hydrophobic surface, which induces a slip length on the order of ten wall units or more.

AB - We present a theoretical prediction for the drag reduction rate achieved by superhydrophobic surfaces in a turbulent channel flow. The predicted drag reduction rate is in good agreement with results obtained from direct numerical simulations at Reτ ≃ 180 and 400. The present theory suggests that large drag reduction is possible also at Reynolds numbers of practical interest (Reτ ∼105-106 by employing a hydrophobic surface, which induces a slip length on the order of ten wall units or more.

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A theoretical prediction of friction drag reduction in turbulent flow by superhydrophobic surfaces

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