Superhydrophobic turbulent drag reduction as a function of surface grating parameters
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...
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| Veröffentlicht in: | Journal of fluid mechanics 2014-05, Vol.747, p.722-734 |
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| container_title | Journal of fluid mechanics |
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| creator | Park, Hyungmin Sun, Guangyi Kim, Chang-Jin “CJ” |
| description | 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
$2.7 \times 2.7 {\mathrm{mm}}^{2}$
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
${\sim }75\, \%$
. |
| doi_str_mv | 10.1017/jfm.2014.151 |
| format | Article |
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$2.7 \times 2.7 {\mathrm{mm}}^{2}$
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
${\sim }75\, \%$
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$2.7 \times 2.7 {\mathrm{mm}}^{2}$
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
${\sim }75\, \%$
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Fluid Mech</addtitle><date>2014-05-25</date><risdate>2014</risdate><volume>747</volume><spage>722</spage><epage>734</epage><pages>722-734</pages><issn>0022-1120</issn><eissn>1469-7645</eissn><coden>JFLSA7</coden><abstract>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
$2.7 \times 2.7 {\mathrm{mm}}^{2}$
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
${\sim }75\, \%$
.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/jfm.2014.151</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-4600-9962</orcidid><oa>free_for_read</oa></addata></record> |
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| source | Cambridge University Press Journals Complete |
| subjects | Boundary layers Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) Physics Turbulence control Turbulent flows, convection, and heat transfer |
| title | Superhydrophobic turbulent drag reduction as a function of surface grating parameters |
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