Flow Visualization Past a Hydrophobic Surface Sphere with a Gas-Liquid Interface

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-...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 18; no. 2; pp. 307 - 313
Main Authors Fujita, Takao, Watanabe, Keizo
Format Journal Article
LanguageJapanese
Published 01.02.2006
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Summary: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.
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ISSN:0387-5016