Journal
PHYSICS OF FLUIDS
Volume 18, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2205307
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We present a theoretical prediction for the drag reduction rate achieved by superhydrophobic surfaces in a turbulent channel flow. The predicted drag reduction rate is in good agreement with results obtained from direct numerical simulations at Re-tau similar or equal to 180 and 400. The present theory suggests that large drag reduction is possible also at Reynolds numbers of practical interest (Re-tau similar to 10(5)-10(6)) by employing a hydrophobic surface, which induces a slip length on the order of ten wall units or more. (C) 2006 American Institute of Physics.
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