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...

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Autores principales:	Baranivignesh Prakash, Jarmo Kouko, Veli-Matti Luukkainen, Ari Jäsberg, Antti I. Koponen
Formato:	article
Lenguaje:	EN
Publicado:	Springer 2021
Materias:	Foam generation Dynamic mixing Power consumption Impeller geometry Aqueous foam Fiber foam Science Q Technology T
Acceso en línea:	https://doaj.org/article/e6ca4f927cba4997a9c83a6fa5526b7d
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spelling	oai:doaj.org-article:e6ca4f927cba4997a9c83a6fa5526b7d2021-11-28T12:13:35ZDynamic generation of aqueous foams and fiber foams in a mixing tank10.1007/s42452-021-04875-z2523-39632523-3971https://doaj.org/article/e6ca4f927cba4997a9c83a6fa5526b7d2021-11-01T00:00:00Zhttps://doi.org/10.1007/s42452-021-04875-zhttps://doaj.org/toc/2523-3963https://doaj.org/toc/2523-3971Abstract 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.Baranivignesh PrakashJarmo KoukoVeli-Matti LuukkainenAri JäsbergAntti I. KoponenSpringerarticleFoam generationDynamic mixingPower consumptionImpeller geometryAqueous foamFiber foamScienceQTechnologyTENSN Applied Sciences, Vol 3, Iss 12, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Foam generation Dynamic mixing Power consumption Impeller geometry Aqueous foam Fiber foam Science Q Technology T
spellingShingle	Foam generation Dynamic mixing Power consumption Impeller geometry Aqueous foam Fiber foam Science Q Technology T Baranivignesh Prakash Jarmo Kouko Veli-Matti Luukkainen Ari Jäsberg Antti I. Koponen Dynamic generation of aqueous foams and fiber foams in a mixing tank
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.
format	article
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
title	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_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_sort	dynamic generation of aqueous foams and fiber foams in a mixing tank
publisher	Springer
publishDate	2021
url	https://doaj.org/article/e6ca4f927cba4997a9c83a6fa5526b7d
work_keys_str_mv	AT baranivigneshprakash dynamicgenerationofaqueousfoamsandfiberfoamsinamixingtank AT jarmokouko dynamicgenerationofaqueousfoamsandfiberfoamsinamixingtank AT velimattiluukkainen dynamicgenerationofaqueousfoamsandfiberfoamsinamixingtank AT arijasberg dynamicgenerationofaqueousfoamsandfiberfoamsinamixingtank AT anttiikoponen dynamicgenerationofaqueousfoamsandfiberfoamsinamixingtank
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Dynamic generation of aqueous foams and fiber foams in a mixing tank

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