By-pass transition of flat plate boundary layers on the surfaces near the limit of admissible roughness
Results of the experimental investigation on the development of boundary layers on flat plates with the smooth surface and with the surfaces covered by sandpapers 60-grit, 80-grit and 100-grit under external turbulent flows of various grid turbulence scales are presented. The displacement thickness...
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| Veröffentlicht in: | Journal of physics. Conference series 2011-12, Vol.318 (3), p.032030-19 |
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| creator | Jonáš, P Hladík, O Mazur, O Uruba, V |
| description | Results of the experimental investigation on the development of boundary layers on flat plates with the smooth surface and with the surfaces covered by sandpapers 60-grit, 80-grit and 100-grit under external turbulent flows of various grid turbulence scales are presented. The displacement thickness Reynolds number was at the most 2000 during experiments. The investigated boundary layers belong to the class of layers close to the lower limit of admissible roughness region, k+ 4.6, 5.7 and 8.7 respectively. It was certified that both the wall roughness and the free stream turbulence accelerate individually the boundary layer development from the laminar state of boundary layer to turbulence. Next it was ascertained that their joint effect amplifies the development of boundary layers so, that the surface roughness impact is predominating but the actions of intensity and length scale of the free stream turbulence disturbances are also significant. With the increasing roughness number the initial region with a pseudo-laminar flow structure and the transitional region become shorter. |
| doi_str_mv | 10.1088/1742-6596/318/3/032030 |
| format | Article |
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The displacement thickness Reynolds number was at the most 2000 during experiments. The investigated boundary layers belong to the class of layers close to the lower limit of admissible roughness region, k+ 4.6, 5.7 and 8.7 respectively. It was certified that both the wall roughness and the free stream turbulence accelerate individually the boundary layer development from the laminar state of boundary layer to turbulence. Next it was ascertained that their joint effect amplifies the development of boundary layers so, that the surface roughness impact is predominating but the actions of intensity and length scale of the free stream turbulence disturbances are also significant. 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Conference series</title><description>Results of the experimental investigation on the development of boundary layers on flat plates with the smooth surface and with the surfaces covered by sandpapers 60-grit, 80-grit and 100-grit under external turbulent flows of various grid turbulence scales are presented. The displacement thickness Reynolds number was at the most 2000 during experiments. The investigated boundary layers belong to the class of layers close to the lower limit of admissible roughness region, k+ 4.6, 5.7 and 8.7 respectively. It was certified that both the wall roughness and the free stream turbulence accelerate individually the boundary layer development from the laminar state of boundary layer to turbulence. Next it was ascertained that their joint effect amplifies the development of boundary layers so, that the surface roughness impact is predominating but the actions of intensity and length scale of the free stream turbulence disturbances are also significant. With the increasing roughness number the initial region with a pseudo-laminar flow structure and the transitional region become shorter.</description><subject>Boundary layer</subject><subject>Boundary layer transition</subject><subject>Flat plates</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Laminar boundary layer</subject><subject>Laminar flow</subject><subject>Physics</subject><subject>Reynolds number</subject><subject>Roughness</subject><subject>Streams</subject><subject>Surface roughness</subject><subject>Turbulence</subject><subject>Turbulent flow</subject><subject>Walls</subject><issn>1742-6596</issn><issn>1742-6588</issn><issn>1742-6596</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp9kE1LwzAch4soOKdfQQJevNTltS9HHb7BwIueQ5omW0bX1Pzbw769qRUVGfaQhuT5Jb88SXJJ8A3BRbEgOadpJspswUixYAvMKGb4KJl9bxz_mp8mZwBbjFn88lmyvtunnQJAfVAtuN75FnmLbKN61MXBoMoPba3CHjVqbwKgCPQbg2AIVmkDqDUqfK40buf6MazqnQNwVWNQ8MN60xqA8-TEqgbMxdd_nrw93L8un9LVy-Pz8naVas55n-rMlKSmmOKM1qWmGhNaYcUJJlozwStScVFXBIvKFpqMDeJbucorpqylls2T6-ncLvj3wUAvYxdtmka1xg8gSS6YECwvSESv_qBbP4Q2tpNU5CXnGRN5pLKJ0sEDBGNlF9wu-pAEy9G_HNXKUa2M_iWTk_8YTKeg891P5iAru3psTg7w_9_xARKdlS4</recordid><startdate>20111222</startdate><enddate>20111222</enddate><creator>Jonáš, P</creator><creator>Hladík, O</creator><creator>Mazur, O</creator><creator>Uruba, V</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7U5</scope><scope>8BQ</scope><scope>JG9</scope></search><sort><creationdate>20111222</creationdate><title>By-pass transition of flat plate boundary layers on the surfaces near the limit of admissible roughness</title><author>Jonáš, P ; Hladík, O ; Mazur, O ; Uruba, V</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c444t-c6e91d202062d9c2c012b0a4101cc354b1b45db105bf8c1face0304a7b3aff2f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Boundary layer</topic><topic>Boundary layer transition</topic><topic>Flat plates</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Laminar boundary layer</topic><topic>Laminar flow</topic><topic>Physics</topic><topic>Reynolds number</topic><topic>Roughness</topic><topic>Streams</topic><topic>Surface roughness</topic><topic>Turbulence</topic><topic>Turbulent flow</topic><topic>Walls</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jonáš, P</creatorcontrib><creatorcontrib>Hladík, O</creatorcontrib><creatorcontrib>Mazur, O</creatorcontrib><creatorcontrib>Uruba, V</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Materials Research Database</collection><jtitle>Journal of physics. 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The displacement thickness Reynolds number was at the most 2000 during experiments. The investigated boundary layers belong to the class of layers close to the lower limit of admissible roughness region, k+ 4.6, 5.7 and 8.7 respectively. It was certified that both the wall roughness and the free stream turbulence accelerate individually the boundary layer development from the laminar state of boundary layer to turbulence. Next it was ascertained that their joint effect amplifies the development of boundary layers so, that the surface roughness impact is predominating but the actions of intensity and length scale of the free stream turbulence disturbances are also significant. With the increasing roughness number the initial region with a pseudo-laminar flow structure and the transitional region become shorter.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/1742-6596/318/3/032030</doi><tpages>19</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Boundary layer Boundary layer transition Flat plates Fluid dynamics Fluid flow Laminar boundary layer Laminar flow Physics Reynolds number Roughness Streams Surface roughness Turbulence Turbulent flow Walls |
| title | By-pass transition of flat plate boundary layers on the surfaces near the limit of admissible roughness |
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