Control of the turbulent wake flow behind a circular cylinder by asymmetric sectoral hydrophobic coatings

Anatoliy Lebedev, Konstantin Dobroselsky, Alexey Safonov, Sergey Starinskiy, Veronica Sulyaeva, Aleksei Lobasov, Vladimir Dulin, Christos N. Markides

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

We demonstrate that sectoral coating by a hydrophobic fluoropolymer is an effective method for controlling flow separation and the turbulent wake behind a cylinder in high Reynolds number flows (Re = 2.2 × 105). Time-resolved particle image velocimetry measurements show that the shape of the wake and trajectory of large-scale vortex structures are inclined due to delayed flow separation on one side of the cylinder. Near-wall, high-resolution visualization reveals that this effect is related to micro-bubbles traveling along the coated surface. The properties of the coatings and bubble presence did not deteriorate, even after many hours of continuous facility operation.

Язык оригиналаанглийский
Номер статьи121703
ЖурналPhysics of Fluids
Том33
Номер выпуска12
DOI
СостояниеОпубликовано - 1 дек. 2021

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