Dynamic generation of aqueous foams and fiber foams in a mixing tank
Abstract Mixing tanks are employed in paper and pulp industries to generate aqueous foams and fiber foams. The aim of the present study was to investigate the effect of impeller geometry on dynamic foam generation in a 60 L mixing tank. Three impeller geometries including two radial—Rushton turbine...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer
2021-11-01
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| Series: | SN Applied Sciences |
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| Online Access: | https://doi.org/10.1007/s42452-021-04875-z |
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| author | Baranivignesh Prakash Jarmo Kouko Veli-Matti Luukkainen Ari Jäsberg Antti I. Koponen |
| author_facet | Baranivignesh Prakash Jarmo Kouko Veli-Matti Luukkainen Ari Jäsberg Antti I. Koponen |
| author_sort | Baranivignesh Prakash |
| collection | DOAJ |
| description | Abstract Mixing tanks are employed in paper and pulp industries to generate aqueous foams and fiber foams. The aim of the present study was to investigate the effect of impeller geometry on dynamic foam generation in a 60 L mixing tank. Three impeller geometries including two radial—Rushton turbine (RT), Bakker turbine (BT6), one axial high solidity pitched blade turbine (HSPBT), and four dual impeller combinations were investigated. Compressed air, water and sodium dodecyl sulphate were used as gas phase, liquid phase and surfactant, respectively, to generate aqueous foam. 1% mass consistency softwood fiber was used to generate fiber foam. The change in aqueous foam density for any given impeller was limited to ± 40 kg/m3 indicating foam density was dictated by impeller type rather than power input. Single impellers generated bubbly liquids whereas dual impellers generated low-density aqueous foams. Besides, stable foam was produced even at low power input compared to single impellers due to increase in impeller swept volume and blade contact area. Addition of fibers increased the foam density by ~ 100–150 kg/m3 and reduced the half-life time by almost threefold for all impellers due to lower air content and higher bubble size. Placement of high shear impeller (BT6) at bottom and down-pumping axial impeller (HSPBT) on top generated fine bubbles. |
| first_indexed | 2024-12-17T18:03:19Z |
| format | Article |
| id | doaj.art-e6ca4f927cba4997a9c83a6fa5526b7d |
| institution | Directory Open Access Journal |
| issn | 2523-3963 2523-3971 |
| language | English |
| last_indexed | 2024-12-17T18:03:19Z |
| publishDate | 2021-11-01 |
| publisher | Springer |
| record_format | Article |
| series | SN Applied Sciences |
| spelling | doaj.art-e6ca4f927cba4997a9c83a6fa5526b7d2022-12-21T21:38:13ZengSpringerSN Applied Sciences2523-39632523-39712021-11-0131211210.1007/s42452-021-04875-zDynamic generation of aqueous foams and fiber foams in a mixing tankBaranivignesh Prakash0Jarmo Kouko1Veli-Matti Luukkainen2Ari Jäsberg3Antti I. Koponen4VTT Technical Research Centre of Finland LtdVTT Technical Research Centre of Finland LtdVTT Technical Research Centre of Finland LtdVTT Technical Research Centre of Finland LtdVTT Technical Research Centre of Finland LtdAbstract Mixing tanks are employed in paper and pulp industries to generate aqueous foams and fiber foams. The aim of the present study was to investigate the effect of impeller geometry on dynamic foam generation in a 60 L mixing tank. Three impeller geometries including two radial—Rushton turbine (RT), Bakker turbine (BT6), one axial high solidity pitched blade turbine (HSPBT), and four dual impeller combinations were investigated. Compressed air, water and sodium dodecyl sulphate were used as gas phase, liquid phase and surfactant, respectively, to generate aqueous foam. 1% mass consistency softwood fiber was used to generate fiber foam. The change in aqueous foam density for any given impeller was limited to ± 40 kg/m3 indicating foam density was dictated by impeller type rather than power input. Single impellers generated bubbly liquids whereas dual impellers generated low-density aqueous foams. Besides, stable foam was produced even at low power input compared to single impellers due to increase in impeller swept volume and blade contact area. Addition of fibers increased the foam density by ~ 100–150 kg/m3 and reduced the half-life time by almost threefold for all impellers due to lower air content and higher bubble size. Placement of high shear impeller (BT6) at bottom and down-pumping axial impeller (HSPBT) on top generated fine bubbles.https://doi.org/10.1007/s42452-021-04875-zFoam generationDynamic mixingPower consumptionImpeller geometryAqueous foamFiber foam |
| spellingShingle | Baranivignesh Prakash Jarmo Kouko Veli-Matti Luukkainen Ari Jäsberg Antti I. Koponen Dynamic generation of aqueous foams and fiber foams in a mixing tank SN Applied Sciences Foam generation Dynamic mixing Power consumption Impeller geometry Aqueous foam Fiber foam |
| title | Dynamic generation of aqueous foams and fiber foams in a mixing tank |
| title_full | Dynamic generation of aqueous foams and fiber foams in a mixing tank |
| title_fullStr | Dynamic generation of aqueous foams and fiber foams in a mixing tank |
| title_full_unstemmed | Dynamic generation of aqueous foams and fiber foams in a mixing tank |
| title_short | Dynamic generation of aqueous foams and fiber foams in a mixing tank |
| title_sort | dynamic generation of aqueous foams and fiber foams in a mixing tank |
| topic | Foam generation Dynamic mixing Power consumption Impeller geometry Aqueous foam Fiber foam |
| url | https://doi.org/10.1007/s42452-021-04875-z |
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