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Physics of Fluids / Volume 14 / Issue 3 / LETTERS

Phys. Fluids 14, L9 (2002); http://dx.doi.org/10.1063/1.1432696 (4 pages)

Apparent fluid slip at hydrophobic microchannel walls

Derek C. Tretheway and Carl D. Meinhart

Department of Mechanical Engineering, University of California, Santa Barbara, California 93106

(Received 23 October 2001; accepted 14 November 2001)

Micron-resolution particle image velocimetry is used to measure the velocity profiles of water flowing through 30×300 μm channels. The velocity profiles are measured to within 450 nm of the microchannel surface. When the surface is hydrophilic (uncoated glass), the measured velocity profiles are consistent with solutions of Stokes’ equation and the well-accepted no-slip boundary condition. However, when the microchannel surface is coated with a 2.3 nm thick monolayer of hydrophobic octadecyltrichlorosilane, an apparent velocity slip is measured just above the solid surface. This velocity is approximately 10% of the free-stream velocity and yields a slip length of approximately 1 μm. For this slip length, slip flow is negligible for length scales greater than 1 mm, but must be considered at the micro- and nano scales. © 2002 American Institute of Physics.

© 2002 American Institute of Physics

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KEYWORDS and PACS

Keywords

slip flow, flow measurement, channel flow

PACS

  • 47.45.Gx

    Slip flows and accommodation

  • 47.60.-i

    Flow phenomena in quasi-one-dimensional systems

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1432696

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. Barrat and L. Bocquet, "Large slip effect at a nonwetting fluid–solid interface," Phys. Rev. Lett. 82, 4671 (1999).

    Y. Zhu and S. Granick, "Rate-dependent slip of Newtonian liquid at smooth surfaces," Phys. Rev. Lett. 87, 096105 (2001).

    R. Pit, H. Hervet, and L. Leger, "Direct experimental evidence of slip in hexadecane: Solid interfaces," Phys. Rev. Lett. 85, 980 (2000).


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