Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion
The effects of bubble size on an upward gas-liquid (CO2-water) flow in a vertical pipe after an abrupt expansion is investigated visually and experimentally in the present work. The mean bubble size varies from small scale (db=0.3mm) to relatively large scale (db=4.5mm). Extensive visualization expe...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2009-05-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/4/2/4_2_442/_pdf/-char/en |
| _version_ | 1819364524290998272 |
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| author | Alexandros VOUTSINAS Toshihiko SHAKOUCHI Koichi TSUJIMOTO Toshitake ANDO |
| author_facet | Alexandros VOUTSINAS Toshihiko SHAKOUCHI Koichi TSUJIMOTO Toshitake ANDO |
| author_sort | Alexandros VOUTSINAS |
| collection | DOAJ |
| description | The effects of bubble size on an upward gas-liquid (CO2-water) flow in a vertical pipe after an abrupt expansion is investigated visually and experimentally in the present work. The mean bubble size varies from small scale (db=0.3mm) to relatively large scale (db=4.5mm). Extensive visualization experiments and PIV analysis show different flow patterns downstream of the expansion of flows containing bubbles of different sizes. The effect of bubble size is also investigated measuring the pressure distribution along the pipe and the drag of the expansion and its difference under different bubble sizes is calculated and compared with that of single-phase flow. The fluctuation phenomena occurring downstream are also investigated. The experiments are conducted under constant Reynolds number (Re=1.0×104) and volumetric gas flow rate ratio (αv=0∼10%). The present work gives valuable information about how the bubble size affects the flow characteristics even under steady flow conditions, and explains the differences between results reported by other authors investigating under similar conditions. |
| first_indexed | 2024-12-24T23:00:18Z |
| format | Article |
| id | doaj.art-39d2d00ad2e540599facb9e8d03d281d |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-24T23:00:18Z |
| publishDate | 2009-05-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-39d2d00ad2e540599facb9e8d03d281d2022-12-21T16:35:09ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582009-05-014244245310.1299/jfst.4.442jfstInvestigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt ExpansionAlexandros VOUTSINAS0Toshihiko SHAKOUCHI1Koichi TSUJIMOTO2Toshitake ANDO3Graduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityThe effects of bubble size on an upward gas-liquid (CO2-water) flow in a vertical pipe after an abrupt expansion is investigated visually and experimentally in the present work. The mean bubble size varies from small scale (db=0.3mm) to relatively large scale (db=4.5mm). Extensive visualization experiments and PIV analysis show different flow patterns downstream of the expansion of flows containing bubbles of different sizes. The effect of bubble size is also investigated measuring the pressure distribution along the pipe and the drag of the expansion and its difference under different bubble sizes is calculated and compared with that of single-phase flow. The fluctuation phenomena occurring downstream are also investigated. The experiments are conducted under constant Reynolds number (Re=1.0×104) and volumetric gas flow rate ratio (αv=0∼10%). The present work gives valuable information about how the bubble size affects the flow characteristics even under steady flow conditions, and explains the differences between results reported by other authors investigating under similar conditions.https://www.jstage.jst.go.jp/article/jfst/4/2/4_2_442/_pdf/-char/engas-liquid two-phase flowexpansion pipe flowbubble size effectflow patternflow fluctuation |
| spellingShingle | Alexandros VOUTSINAS Toshihiko SHAKOUCHI Koichi TSUJIMOTO Toshitake ANDO Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion Journal of Fluid Science and Technology gas-liquid two-phase flow expansion pipe flow bubble size effect flow pattern flow fluctuation |
| title | Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion |
| title_full | Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion |
| title_fullStr | Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion |
| title_full_unstemmed | Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion |
| title_short | Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion |
| title_sort | investigation of bubble size effect on vertical upward bubbly two phase pipe flow consisted with an abrupt expansion |
| topic | gas-liquid two-phase flow expansion pipe flow bubble size effect flow pattern flow fluctuation |
| url | https://www.jstage.jst.go.jp/article/jfst/4/2/4_2_442/_pdf/-char/en |
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