Drag reduction in Stokes flows over spheres with nanostructured superhydrophilic surfaces

Title
Drag reduction in Stokes flows over spheres with nanostructured superhydrophilic surfaces
Author(s)
변찬남영석[남영석]김성진[김성진]주성택[주성택]
Keywords
VELOCITY
Issue Date
201003
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.107, no.6
Abstract
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.
URI
http://hdl.handle.net/YU.REPOSITORY/22757http://dx.doi.org/10.1063/1.3353842
ISSN
0021-8979
Appears in Collections:
공과대학 > 기계공학부 > Articles
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