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- W4320498867 abstract "Abstract Delaying laminar–turbulent transition in boundary layers is of great interest since the skin-friction coefficient can be reduced by up to one order of magnitude. In this experimental research, it is shown that counter-rotating cylindrical roughness elements are able to delay transition under realistic flow conditions. Evidence is given by the intermittency, evaluated from hot-film measurements in a laminar water channel. An increase in rotation speed results in a delay of transition of up to $${6.5}{%}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mrow> <mml:mn>6.5</mml:mn> </mml:mrow> <mml:mo>%</mml:mo> </mml:mrow> </mml:math> in the center of the plate. This trend can be explained by the streaks amplified by the rotating cylinders, resulting in a damping of the fluctuation amplitude in the boundary layer. The advantage of this method is that the transition delay can be actively controlled with conventional cylindrical roughness elements. Graphical abstract" @default.
- W4320498867 created "2023-02-14" @default.
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- W4320498867 date "2023-02-01" @default.
- W4320498867 modified "2023-10-14" @default.
- W4320498867 title "Delay of laminar–turbulent transition by counter-rotating cylindrical roughness elements in a laminar flat plate boundary layer" @default.
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- W4320498867 doi "https://doi.org/10.1007/s00348-023-03581-3" @default.
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