Flow visualization past a hydrophobic surface sphere with a gas-liquid interface

被引：0

作者：

Fujita, Takao ^{[1
]}

Watanabe, Keizo ^{[1
]}

机构：

[1] Graduate School of Engineering, Department of Mechanical Engineering, Tokyo Metropolitan University, Hachiooji-shi, Tokyo, 192-0397

来源：

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2006年 / 72卷 / 02期

关键词：

Drag Reduction; Flow Past a Sphere; Fluid Slip; Gas-Liquid Interface; Hydrophobic Surface; Incompressible Flow; Wettability Surface;

D O I：

10.1299/kikaib.72.307

中图分类号：

学科分类号：

摘要：

Drag reduction is achieved by using a hydrophobic surface with fluid slip. Fluid slip is closely related to a gas-liquid interface formed as a solid surface with many fine grooves. The friction generated by the solid boundary is modified considerably because the gas-liquid interface provides a zero-shear stress boundary condition. The purpose of this study is to experimentally clarify flow patterns and drag reduction of a hydrophobic surface sphere by visualizing flow and measuring the drag. The flow visualization results showed that the Vortex Loop was not exist at Re < 400 in the hydrophobic surface sphere and the separation point moved downstream. The maximum drag reduction ratio was 28.5% at Re=7.2.

引用

收藏

页码：307 / 313

页数：6

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