EXPERIMENTAL INVESTIGATION OF FLOW STRUCTURE DOWNSTREAM OF PERMEABLE CYLINDERS

Autor:	Huseyin Akilli, Bengi Gözmen Şanli
Rok vydání:	2018
Předmět:	Materials science Flow (psychology) Mühendislik Reynolds number PIV vortex shedding permeable cylinder Deep Water General Medicine Mechanics Wake Vortex shedding Cylinder (engine) law.invention symbols.namesake Engineering Particle image velocimetry law Turbulence kinetic energy symbols Porosity
Zdroj:	Volume: 2, Issue: 2 54-59 Turkish Journal of Engineering
ISSN:	2587-1366
DOI:	10.31127/tuje.349532
Popis:	Flow structure downstream of permeable cylinders was investigated using high-image density Particle Image Velocimetry technique in deep water. The free stream velocity is U∞= 156 mm/s, which corresponds to the Reynolds number of Re=6250 based on the cylinder diameter D=37.5 mm. To reveal the effect of the porosity, four different porosities (β= 0.4, 0.5, 0.6 and 0.7) were used. This study showed that the usage of permeable cylinder decreases the occurrence of large-scale vortical structures downstream of the bluff body. As the porosity increases, turbulent kinetic energy, Reynolds shear stress and intensity of turbulences decrease as a sign of attenuated fluctuations in the wake region. For the permeable cylinders having the porosity higher than 0.6, the flow behaves as there is no object in flow.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b872d6049b7bf174908811bf7c81c342 https://doi.org/10.31127/tuje.349532 Zobrazit plný text záznamu