Scaling of drag reduction and logarithmic profile in the turbulent boundary layer over micro-grated superhydrophobic surfaces
Bingfu Zhang,
Feng Guo,
Suet To
et al.
Abstract:We developed a dedicated, high-resolution skin-friction balance in a water tunnel to measure turbulent drag reduction over micro-grate-patterned superhydrophobic (SHPO) surfaces at the Reynolds number ReL ranging from 4.1 × 105 to 6.9 × 105 and achieved a significant drag reduction of up to 46%. The correlation between drag reduction and surface topology was investigated. By considering air fraction, micro-grate gap, and meniscus curvature, an empirical scaling for drag reduction was proposed, which reconciles… Show more
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