Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank
The present study investigated the effect of impeller speed and vortex ingestion on vortex shape, gas holdup, and bubble size distribution in an unbaffled stirred tank using optical probe measurements. Further, the ability of the volume of the fluid model to predict vortex shape was examined. Withou...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Wiley-Blackwell Publishing
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/74613 |
| _version_ | 1848763323948990464 |
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| author | Prakash, Baranivignesh Bhatelia, T. Wadnerakr, D. Shah, M. Pareek, V. Utikar, R. |
| author_facet | Prakash, Baranivignesh Bhatelia, T. Wadnerakr, D. Shah, M. Pareek, V. Utikar, R. |
| author_sort | Prakash, Baranivignesh |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The present study investigated the effect of impeller speed and vortex ingestion on vortex shape, gas holdup, and bubble size distribution in an unbaffled stirred tank using optical probe measurements. Further, the ability of the volume of the fluid model to predict vortex shape was examined. Without vortex ingestion, an increase in impeller speed resulted in a significant variation in vortex shape, whereas it had a negligible effect on vortex shape with ingestion. This suggests that when vortex ingestion occurred, most of the energy was consumed for the dispersion of gas rather than the deformation of the gas‐liquid interface. It was observed that a large number of gas bubbles were entrained into the vortex core around the impeller region, which led to a lower gas holdup at the top axial locations. An increase in the impeller speed also resulted in the formation of larger bubbles. The absence of baffles limits shear for bubble break up, resulting in larger bubbles above the impeller plane. |
| first_indexed | 2025-11-14T11:01:39Z |
| format | Journal Article |
| id | curtin-20.500.11937-74613 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:01:39Z |
| publishDate | 2018 |
| publisher | Wiley-Blackwell Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-746132019-08-06T06:31:29Z Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank Prakash, Baranivignesh Bhatelia, T. Wadnerakr, D. Shah, M. Pareek, V. Utikar, R. The present study investigated the effect of impeller speed and vortex ingestion on vortex shape, gas holdup, and bubble size distribution in an unbaffled stirred tank using optical probe measurements. Further, the ability of the volume of the fluid model to predict vortex shape was examined. Without vortex ingestion, an increase in impeller speed resulted in a significant variation in vortex shape, whereas it had a negligible effect on vortex shape with ingestion. This suggests that when vortex ingestion occurred, most of the energy was consumed for the dispersion of gas rather than the deformation of the gas‐liquid interface. It was observed that a large number of gas bubbles were entrained into the vortex core around the impeller region, which led to a lower gas holdup at the top axial locations. An increase in the impeller speed also resulted in the formation of larger bubbles. The absence of baffles limits shear for bubble break up, resulting in larger bubbles above the impeller plane. 2018 Journal Article http://hdl.handle.net/20.500.11937/74613 Wiley-Blackwell Publishing restricted |
| spellingShingle | Prakash, Baranivignesh Bhatelia, T. Wadnerakr, D. Shah, M. Pareek, V. Utikar, R. Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank |
| title | Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank |
| title_full | Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank |
| title_fullStr | Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank |
| title_full_unstemmed | Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank |
| title_short | Vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank |
| title_sort | vortex shape and gas‐liquid hydrodynamics in unbaffled stirred tank |
| url | http://hdl.handle.net/20.500.11937/74613 |