Particle image velocimetry characterization of turbulent channel flow with rib patterned superhydrophobic walls

By B. Woolford, J. Prince, Daniel Maynes, B. W. Webb. 2009

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Superhydrophobic surfaces: From the lotus leaf to the submarine (2012, background): “[35], who demonstrated that in a turbulent-flow regime, streamwise ridges (i.”
On the mechanism of turbulent drag reduction with super-hydrophobic surfaces (2015, methodology): “In micro-channels with arrays of SH longitudinal micro-grooves (MG) on one or both walls, DRs of 0 % (Peguero & Bruer 2009), 11 % (Woolford et al. 2009) and up to 50 % (Daniello, Waterhouse & Rothstein 2009) have been experimentally observed with g/w= 1, g+0≈ 0.2; g/w= 4, 1.3 . g+0 .”
Superhydrophobic turbulent drag reduction as a function of surface grating parameters (2014, methodology): “Although they were performed in channel flows, their Reynolds numbers (Reτ ∼ 180 and 100, estimated from the provided data (Daniello et al. 2009; Woolford et al. 2009b)) were similar to the current study in a TBL flow (Reτ ∼ 250).”
Characterization of superhydrophobic surfaces for drag reduction in turbulent flow (2018, background): “…frictional drag reduction to wall-bounded turbulent flows has not been straightforward (Watanabe & Udagawa 2001; Henoch et al. 2006; Zhao et al. 2007; Daniello, Waterhouse & Rothstein 2009; Woolford et al. 2009; Jung & Bhushan 2010; Aljallis et al. 2013; Bidkar et al. 2014; Park, Sun & Kim 2014).”