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Journal of Applied Physics / Volume 107 / Issue 6 / COMMUNICATIONS

J. Appl. Phys. 107, 066102 (2010); http://dx.doi.org/10.1063/1.3353842 (3 pages)

Drag reduction in Stokes flows over spheres with nanostructured superhydrophilic surfaces

Chan Byon1,2, Youngsuk Nam1, Sung Jin Kim2, and Y. Sungtaek Ju1

1University of California, Los Angeles, California 90095-1597, USA
2Korean Advanced Institute of Technology, Daejon, South Korea

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(Received 1 September 2009; accepted 31 January 2010; published online 17 March 2010)

Nanostructured surfaces offer opportunities to modify flow induced drag on solid objects. Measurements of the terminal velocity reveal that the drag associated with laminar Stokes flows can be reduced for spheres with nanostructured superhydrophilic as well as superhydrophobic surfaces. Numerical simulations suggest that the formation of recirculating or nearly stagnant flow zones leads to significant reduction in the friction drag. Such reduction, however, is offset by an increase in the form drag that arises from nonuniform pressure distributions. Our work motivates further studies to optimally balance the friction and form drag and control resistance to laminar flows over objects with nanostructured surfaces.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

drag reduction, flow simulation, hydrophilicity, laminar flow, nanofluidics

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3353842

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

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

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    References

    E. Bonaccurso, H. Butt, and V. S. J. Craig, Phys. Rev. Lett. 90, 144501 (2003).

    M. Sbragaglia, R. Benzi, L. Biferale, S. Succi, and F. Toschi, Phys. Rev. Lett. 97, 204503 (2006).

    G. McHale, N. J. Shirtcliffe, C. R. Evans, and M. I. Newton, Appl. Phys. Lett. 94, 064104 (2009)APPLAB000094000006064104000001.


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