Local Flow Field and Slip Length of Superhydrophobic Surfaces

被引：97

作者：

Schaeffel, David ^{[1
]}

Koynov, Kaloian ^{[1
]}

Vollmer, Doris ^{[1
]}

Butt, Hans-Juergen ^{[1
]}

Schoenecker, Clarissa ^{[1
]}

机构：

[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 13期

关键词：

FLUORESCENCE CORRELATION SPECTROSCOPY; DRAG REDUCTION; BOUNDARY-CONDITIONS; FLUID; FRICTION; LIQUID; WATER;

D O I：

10.1103/PhysRevLett.116.134501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

While the global slippage of water past superhydrophobic surfaces has attracted wide interest, the local distribution of slip still remains unclear. Using fluorescence correlation spectroscopy, we performed detailed measurements of the local flow field and slip length for water in the Cassie state on a microstructured superhydrophobic surface. We revealed that the local slip length is finite, nonconstant, anisotropic, and sensitive to the presence of surfactants. In combination with numerical calculations of the flow, we can explain all these properties by the local hydrodynamics.

引用

页数：5

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