On air-entraining flow in pump's sump with a vertical suction pipe below critical submergence
In pump’s sumps, the air entrainment sometimes occurs. Such flow accompanying the air entrainment becomes complicated owing to both of its unsteadiness with poor periodicity and its fully-three-dimensionality. In various industrial and environmental problems, the air entrainment often induces vibrat...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2019-03-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/14/1/14_2019jfst0003/_pdf/-char/en |
| _version_ | 1819364678161137664 |
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| author | Katsuya HIRATA Masakatsu HATTORI Akira MORITA Tsuyoshi MAEDA Takashi NOGUCHI |
| author_facet | Katsuya HIRATA Masakatsu HATTORI Akira MORITA Tsuyoshi MAEDA Takashi NOGUCHI |
| author_sort | Katsuya HIRATA |
| collection | DOAJ |
| description | In pump’s sumps, the air entrainment sometimes occurs. Such flow accompanying the air entrainment becomes complicated owing to both of its unsteadiness with poor periodicity and its fully-three-dimensionality. In various industrial and environmental problems, the air entrainment often induces vibration, noise, low pumping efficiency or pump’s collapse at the worst, and is usually complicated owing to both their unsteadiness with poor periodicity and their fully-three-dimensionality. The present aim is to understand the air entrainment into a suction pipe, which appears inside a simple and basic suction sump in the vertical-wet-pit-pump configuration. In particular, we focus upon the influences of governing parameters upon the occurrence-time ratio γ of the air entrainment in over-critical-submergence condition, using a conductance-type electric sensor which can detect the existence of air bubbles through a suction pipe with no disturbances by the sensor probe and with a fine spatial resolution in order to achieve accurate measurements. As a result, we reveal the influences of such three kinetic parameters as the Froude number, the Reynolds number and the Weber number (or the Bond number) together with four geometric parameters upon the air entrainment and the free-surface pattern inside the suction sump. |
| first_indexed | 2024-12-24T23:02:45Z |
| format | Article |
| id | doaj.art-6b34bb4e49d0433c853c8db945b331a7 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-24T23:02:45Z |
| publishDate | 2019-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-6b34bb4e49d0433c853c8db945b331a72022-12-21T16:35:06ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582019-03-01141JFST0003JFST000310.1299/jfst.2019jfst0003jfstOn air-entraining flow in pump's sump with a vertical suction pipe below critical submergenceKatsuya HIRATA0Masakatsu HATTORI1Akira MORITA2Tsuyoshi MAEDA3Takashi NOGUCHI4Department of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityDepartment of Aeronautics and Astronautics, Kyoto UniversityIn pump’s sumps, the air entrainment sometimes occurs. Such flow accompanying the air entrainment becomes complicated owing to both of its unsteadiness with poor periodicity and its fully-three-dimensionality. In various industrial and environmental problems, the air entrainment often induces vibration, noise, low pumping efficiency or pump’s collapse at the worst, and is usually complicated owing to both their unsteadiness with poor periodicity and their fully-three-dimensionality. The present aim is to understand the air entrainment into a suction pipe, which appears inside a simple and basic suction sump in the vertical-wet-pit-pump configuration. In particular, we focus upon the influences of governing parameters upon the occurrence-time ratio γ of the air entrainment in over-critical-submergence condition, using a conductance-type electric sensor which can detect the existence of air bubbles through a suction pipe with no disturbances by the sensor probe and with a fine spatial resolution in order to achieve accurate measurements. As a result, we reveal the influences of such three kinetic parameters as the Froude number, the Reynolds number and the Weber number (or the Bond number) together with four geometric parameters upon the air entrainment and the free-surface pattern inside the suction sump.https://www.jstage.jst.go.jp/article/jfst/14/1/14_2019jfst0003/_pdf/-char/enpumpsuction sumpopen sumpwater intakethree-dimensional flowtwo-phase flowunsteady flowair entrainment |
| spellingShingle | Katsuya HIRATA Masakatsu HATTORI Akira MORITA Tsuyoshi MAEDA Takashi NOGUCHI On air-entraining flow in pump's sump with a vertical suction pipe below critical submergence Journal of Fluid Science and Technology pump suction sump open sump water intake three-dimensional flow two-phase flow unsteady flow air entrainment |
| title | On air-entraining flow in pump's sump with a vertical suction pipe below critical submergence |
| title_full | On air-entraining flow in pump's sump with a vertical suction pipe below critical submergence |
| title_fullStr | On air-entraining flow in pump's sump with a vertical suction pipe below critical submergence |
| title_full_unstemmed | On air-entraining flow in pump's sump with a vertical suction pipe below critical submergence |
| title_short | On air-entraining flow in pump's sump with a vertical suction pipe below critical submergence |
| title_sort | on air entraining flow in pump apos s sump with a vertical suction pipe below critical submergence |
| topic | pump suction sump open sump water intake three-dimensional flow two-phase flow unsteady flow air entrainment |
| url | https://www.jstage.jst.go.jp/article/jfst/14/1/14_2019jfst0003/_pdf/-char/en |
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