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Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation

The present study addresses the incorporation of fine particles into liquids via the creation of a large-scale swirling vortex on the liquid free surface using a rotary impeller positioned along the axis of a cylindrical vessel. Four types of particles are used in the experiments to investigate the...

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Detalles Bibliográficos
Autores principales: Komarov, Sergey V., Yamamoto, Takuya, Arai, Hirotada
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8196717/
https://www.ncbi.nlm.nih.gov/pubmed/34063966
http://dx.doi.org/10.3390/ma14112710
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author Komarov, Sergey V.
Yamamoto, Takuya
Arai, Hirotada
author_facet Komarov, Sergey V.
Yamamoto, Takuya
Arai, Hirotada
author_sort Komarov, Sergey V.
collection PubMed
description The present study addresses the incorporation of fine particles into liquids via the creation of a large-scale swirling vortex on the liquid free surface using a rotary impeller positioned along the axis of a cylindrical vessel. Four types of particles are used in the experiments to investigate the incorporation efficiency of the particles into a water bath under different impeller rotation speeds. Additionally, the vortex characteristics are investigated numerically. The results reveal that two factors, namely the particle wettability and turbulent oscillations at the bottom part of vortex surface, play dominant roles in determining the particle incorporation behavior. Hydrophobic particles are incapable of being incorporated into the water bath under any of the conditions examined in the present study. Partly wettable particles are entrained into the water bath, with the efficiency increasing with the impeller rotation speed and particle size. This is because an increase in the impeller rotation speed causes vortex deformation, whereby its bottom part approaches the impeller blades where the turbulent surface oscillations reach maximum amplitudes. Another possible mechanism of particle incorporation is the effect of capillary increases of liquid into the spaces between particles, which accumulate on the bottom surface of the vortex.
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spelling pubmed-81967172021-06-13 Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation Komarov, Sergey V. Yamamoto, Takuya Arai, Hirotada Materials (Basel) Article The present study addresses the incorporation of fine particles into liquids via the creation of a large-scale swirling vortex on the liquid free surface using a rotary impeller positioned along the axis of a cylindrical vessel. Four types of particles are used in the experiments to investigate the incorporation efficiency of the particles into a water bath under different impeller rotation speeds. Additionally, the vortex characteristics are investigated numerically. The results reveal that two factors, namely the particle wettability and turbulent oscillations at the bottom part of vortex surface, play dominant roles in determining the particle incorporation behavior. Hydrophobic particles are incapable of being incorporated into the water bath under any of the conditions examined in the present study. Partly wettable particles are entrained into the water bath, with the efficiency increasing with the impeller rotation speed and particle size. This is because an increase in the impeller rotation speed causes vortex deformation, whereby its bottom part approaches the impeller blades where the turbulent surface oscillations reach maximum amplitudes. Another possible mechanism of particle incorporation is the effect of capillary increases of liquid into the spaces between particles, which accumulate on the bottom surface of the vortex. MDPI 2021-05-21 /pmc/articles/PMC8196717/ /pubmed/34063966 http://dx.doi.org/10.3390/ma14112710 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Komarov, Sergey V.
Yamamoto, Takuya
Arai, Hirotada
Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation
title Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation
title_full Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation
title_fullStr Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation
title_full_unstemmed Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation
title_short Incorporation of Powder Particles into an Impeller-Stirred Liquid Bath through Vortex Formation
title_sort incorporation of powder particles into an impeller-stirred liquid bath through vortex formation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8196717/
https://www.ncbi.nlm.nih.gov/pubmed/34063966
http://dx.doi.org/10.3390/ma14112710
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