Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler
Ultrasound velocity profiler (UVP) is applied to measurements of a horizontal turbulent bubbly channel flow to ascertain the mechanism of bubble-induced frictional drag reduction. Typical parameter regimes of the target flow are Re number of 0.6-6.0 x104, void fraction of 0-3%, and bubble diameter o...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2006-06-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/1/1/1_1_12/_pdf/-char/en |
| _version_ | 1818753368300978176 |
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| author | Yuichi MURAI Hideki FUJII Yuji TASAKA Yasushi TAKEDA |
| author_facet | Yuichi MURAI Hideki FUJII Yuji TASAKA Yasushi TAKEDA |
| author_sort | Yuichi MURAI |
| collection | DOAJ |
| description | Ultrasound velocity profiler (UVP) is applied to measurements of a horizontal turbulent bubbly channel flow to ascertain the mechanism of bubble-induced frictional drag reduction. Typical parameter regimes of the target flow are Re number of 0.6-6.0 x104, void fraction of 0-3%, and bubble diameter of 10-50mm. Since the UVP system only outputs velocity profiles on an ultrasound beam inside a liquid phase, a signal processing method for raw velocity data is proposed and used to detect the bubble interface. A conditional averaged liquid phase velocity profile that excludes gas phase data, has shown for the first time the structure of a turbulent boundary layer altered by large buoyant bubbles sliding along the channel wall. |
| first_indexed | 2024-12-18T05:06:15Z |
| format | Article |
| id | doaj.art-3440f4934d1d4a7fb2ede54a7798768c |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-18T05:06:15Z |
| publishDate | 2006-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-3440f4934d1d4a7fb2ede54a7798768c2022-12-21T21:19:59ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582006-06-0111122310.1299/jfst.1.12jfstTurbulent Bubbly Channel Flow Investigated by Ultrasound Velocity ProfilerYuichi MURAI0Hideki FUJII1Yuji TASAKA2Yasushi TAKEDA3Division of Energy & Environmental System, Graduate School of Engineering, Hokkaido UniversityDivision of Energy & Environmental System, Graduate School of Engineering, Hokkaido UniversityDivision of Energy & Environmental System, Graduate School of Engineering, Hokkaido UniversityDivision of Energy & Environmental System, Graduate School of Engineering, Hokkaido UniversityUltrasound velocity profiler (UVP) is applied to measurements of a horizontal turbulent bubbly channel flow to ascertain the mechanism of bubble-induced frictional drag reduction. Typical parameter regimes of the target flow are Re number of 0.6-6.0 x104, void fraction of 0-3%, and bubble diameter of 10-50mm. Since the UVP system only outputs velocity profiles on an ultrasound beam inside a liquid phase, a signal processing method for raw velocity data is proposed and used to detect the bubble interface. A conditional averaged liquid phase velocity profile that excludes gas phase data, has shown for the first time the structure of a turbulent boundary layer altered by large buoyant bubbles sliding along the channel wall.https://www.jstage.jst.go.jp/article/jfst/1/1/1_1_12/_pdf/-char/enultrasound velocity profilermultiphase flowturbulent flowdrag reductionbubble dynamics |
| spellingShingle | Yuichi MURAI Hideki FUJII Yuji TASAKA Yasushi TAKEDA Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler Journal of Fluid Science and Technology ultrasound velocity profiler multiphase flow turbulent flow drag reduction bubble dynamics |
| title | Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler |
| title_full | Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler |
| title_fullStr | Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler |
| title_full_unstemmed | Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler |
| title_short | Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler |
| title_sort | turbulent bubbly channel flow investigated by ultrasound velocity profiler |
| topic | ultrasound velocity profiler multiphase flow turbulent flow drag reduction bubble dynamics |
| url | https://www.jstage.jst.go.jp/article/jfst/1/1/1_1_12/_pdf/-char/en |
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