期刊
JOURNAL OF FLUID MECHANICS
卷 747, 期 -, 页码 722-734出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2014.151
关键词
drag reduction; MEMS/NEMS; turbulence control
资金
- ONR Grant [N000141110503]
- NSF Grant [1336966]
- Directorate For Engineering [1336966] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1336966] Funding Source: National Science Foundation
Despite the confirmation of slip flows and successful drag reduction (DR) in small-scaled laminar flows, the full impact of superhydrophobic (SHPo) DR remained questionable because of the sporadic and inconsistent experimental results in turbulent flows. Here we report a systematic set of bias-free reduction data obtained by measuring the skin-friction drags on a SHPo surface and a smooth surface at the same time and location in a turbulent boundary layer (TBL) flow. Each monolithic sample consists of a SHPo surface and a smooth surface suspended by flexure springs, all carved out from a 2.7 x 2.7 mm(2) silicon chip by photolithographic microfabrication. The flow tests allow continuous monitoring of the plastron on the SHPo surfaces, so that the DR data are genuine and consistent. A family of SHPo samples with precise profiles reveals the effects of grating parameters on turbulent DR, which was measured to be as much as similar to 75 %.
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