Control of Turbulent Channel Flow over a Backward-Facing Step by Suction
The Turbulent channel flow over a backward-facing step was investigated experimentally by using suction through a slit at the bottom corner of the step. Suction was continuously applied, and the direction of the suction was perpendicular and horizontal to the main flow. The suction flow ratio was va...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2009-04-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/4/1/4_1_188/_pdf/-char/en |
| _version_ | 1818942560889995264 |
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| author | Masatoshi SANO Ippei SUZUKI Kenichiro SAKURABA |
| author_facet | Masatoshi SANO Ippei SUZUKI Kenichiro SAKURABA |
| author_sort | Masatoshi SANO |
| collection | DOAJ |
| description | The Turbulent channel flow over a backward-facing step was investigated experimentally by using suction through a slit at the bottom corner of the step. Suction was continuously applied, and the direction of the suction was perpendicular and horizontal to the main flow. The suction flow ratio was varied from 0.00 to 0.15. The wall static pressure and local heat transfer coefficient were measured behind the backward-facing step. The velocity profiles and turbulent quantities were measured by PIV. It was found that the pressure drop at the step was reduced and the heat transfer coefficient in the recirculating region was improved by suction. The suction direction did not affect the heat transfer or fluid flow characteristics. Enhancement of the heat transfer coefficient was related to the increase in turbulent energy, Reynolds shear stress and turbulent diffusions. However, the region where these quantities increase was limited to the area immediately behind the step. When strong suction was applied, periodic fluctuating motion occurred. |
| first_indexed | 2024-12-20T07:13:23Z |
| format | Article |
| id | doaj.art-3500b877d3cd48cb989614b6d30205e8 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-20T07:13:23Z |
| publishDate | 2009-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-3500b877d3cd48cb989614b6d30205e82022-12-21T19:48:50ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582009-04-014118819910.1299/jfst.4.188jfstControl of Turbulent Channel Flow over a Backward-Facing Step by SuctionMasatoshi SANO0Ippei SUZUKI1Kenichiro SAKURABA2Department of Mechanical Science and Engineering, Chiba Institute of TechnologyDepartment of Mechanical Science and Engineering, Chiba Institute of TechnologyTokyo Metropolitan Industrial Technology Research InstituteThe Turbulent channel flow over a backward-facing step was investigated experimentally by using suction through a slit at the bottom corner of the step. Suction was continuously applied, and the direction of the suction was perpendicular and horizontal to the main flow. The suction flow ratio was varied from 0.00 to 0.15. The wall static pressure and local heat transfer coefficient were measured behind the backward-facing step. The velocity profiles and turbulent quantities were measured by PIV. It was found that the pressure drop at the step was reduced and the heat transfer coefficient in the recirculating region was improved by suction. The suction direction did not affect the heat transfer or fluid flow characteristics. Enhancement of the heat transfer coefficient was related to the increase in turbulent energy, Reynolds shear stress and turbulent diffusions. However, the region where these quantities increase was limited to the area immediately behind the step. When strong suction was applied, periodic fluctuating motion occurred.https://www.jstage.jst.go.jp/article/jfst/4/1/4_1_188/_pdf/-char/enturbulencechannel flowbackward-facing stepheat transferturbulent structureparticle image velocimetry |
| spellingShingle | Masatoshi SANO Ippei SUZUKI Kenichiro SAKURABA Control of Turbulent Channel Flow over a Backward-Facing Step by Suction Journal of Fluid Science and Technology turbulence channel flow backward-facing step heat transfer turbulent structure particle image velocimetry |
| title | Control of Turbulent Channel Flow over a Backward-Facing Step by Suction |
| title_full | Control of Turbulent Channel Flow over a Backward-Facing Step by Suction |
| title_fullStr | Control of Turbulent Channel Flow over a Backward-Facing Step by Suction |
| title_full_unstemmed | Control of Turbulent Channel Flow over a Backward-Facing Step by Suction |
| title_short | Control of Turbulent Channel Flow over a Backward-Facing Step by Suction |
| title_sort | control of turbulent channel flow over a backward facing step by suction |
| topic | turbulence channel flow backward-facing step heat transfer turbulent structure particle image velocimetry |
| url | https://www.jstage.jst.go.jp/article/jfst/4/1/4_1_188/_pdf/-char/en |
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