Drag-reducing performance of obliquely aligned superhydrophobic surface in turbulent channel flow

Sho Watanabe, Hiroya Mamori, Koji Fukagata

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Friction drag reduction effect by superhydrophobic surfaces in a turbulent channel flow is investigated by means of direct numerical simulation. The simulations are performed under a constant pressure gradient at the friction Reynolds number of 180. A special focus is laid upon the influence of the angle of microridge structure to flow direction, while the gas area fraction on the surface is kept at 50% and the groove width is kept constant at 33.75 wall units. Larger drag reduction effect is observed for a smaller angle: the bulk-mean velocity is increased about 15% when the microridge is parallel to the flow. The drag reduction effect is found to deteriorate rapidly with the microridge angle due to a decrease in the slip velocity. The Reynolds stress budgets show that the modification in each physical effect is qualitatively similar but more pronounced when the microridge is aligned with the stream.

本文言語English
論文番号025501
ジャーナルFluid Dynamics Research
49
2
DOI
出版ステータスPublished - 2017 1月 17

ASJC Scopus subject areas

  • 機械工学
  • 物理学および天文学(全般)
  • 流体および伝熱

フィンガープリント

「Drag-reducing performance of obliquely aligned superhydrophobic surface in turbulent channel flow」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル