Fibrillar structures to reduce viscous drag on aerodynamic and hydrodynamic wall surfaces
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United States of America Patent
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Nov 10, 2020
Grant Date -
Jan 21, 2016
app pub date -
Mar 12, 2014
filing date -
Mar 12, 2013
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Abstract
An aerodynamic or hydrodynamic wall surface has an array of fibrillar structures disposed on and extending from the wall surface, wherein each fibrillar structure comprises a stalk and a tip. The stalk has a first end and a second end, wherein the first end is attached to the wall surface, and the stalk is oriented with respect to the wall surface at a stalk angle between approximately 1 degrees and 179 degrees. The tip has a first side and a second side, wherein the first side is attached proximate to the second end of the stalk, the tip has a larger cross-sectional area than the stalk, and the second side comprises a substantially planar surface that is oriented with respect to the stalk at a tip angle between approximately 0 degrees and 90 degrees.
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