Quantifying effective slip length over micropatterned hydrophobic surfaces

Details Quantifying effective slip length over micropatterned hydrophobic surfaces Quantifying effective slip length over micropatterned hydrophobic surfaces

2009-02-10

arxiv.org/abs/0902.1621v1

Physics of Fluids, 21, 112002 (2009)

Physics

Fluid Dynamics

8 pages

Scientific paper

10.1063/1.3266505

We employ micro-particle image velocimetry ($\mu$-PIV) to investigate laminar micro-flows in hydrophobic microstructured channels, in particular the slip length. These microchannels consist of longitudinal micro-grooves, which can trap air and prompt a shear-free boundary condition and thus slippage enhancement. Our measurements reveal an increase of the slip length when the width of the micro-grooves is enlarged. The result of the slip length is smaller than the analytical prediction by Philip et al. [1] for an infinitely large and textured channel comprised of alternating shear-free and no-slip boundary conditions. The smaller slip length (as compared to the prediction) can be attributed to the confinement of the microchannel and the bending of the meniscus (liquid-gas interface). Our experimental studies suggest that the curvature of the meniscus plays an important role in microflows over hydrophobic micro-ridges.

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