ID | 65281 |
FullText URL | |
Author |
Yamaguchi, Akito
Department of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama University
Okano, Hitoshi
Department of Material and Energy Science, Graduate School of Environmental Science
Sumitomo, Syunsuke
Department of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama University
Uddin, Md. Azhar
Department of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama University
|
Abstract | Agglomeration, coalescence and flotation of non-metallic inclusions in steel melt are effective for obtaining “clean steel.” In this study, the agglomeration and breakup behaviors of particles with a primary particle size distribution (hereinafter, polydisperse particles) in a liquid under impeller and gas stirring were compared by numerical calculations and model experiments. The particle-size-grouping (PSG) method in the numerical agglomeration model of particles was combined with a breakup term of agglomeration due to bubble bursting at the free surface. Polydisperse and monodisperse polymethylmethacrylate (PMMA) particles were used in the agglomeration experiments. The agglomeration rate of the polydisperse particles under impeller stirring was increased by an increasing energy input rate, whereas the agglomeration rate under gas stirring decreased under this condition due to the larger contribution of the breakup of agglomerated particles during bubble bursting in gas stirring. At the same energy input rate, agglomeration of polydisperse particles was larger under impeller stirring than under gas stirring. The agglomeration rate of polydisperse particles was larger than that of monodisperse particles under both impeller and gas stirring at the same energy input rate. The computational temporal changes in the total number of particles were in good agreement with the experimental results. This means that the difference in the agglomeration behaviors observed in impeller and gas stirring can be explained by the turbulent coagulation and subsequent agglomerated particle breakup in gas stirring. The computational temporal change in the number of each group approximately agreed with the experimental change in both impeller and gas stirring.
|
Keywords | agglomeration
breakup
particle
impeller stirring
gas agitation
particle-size-grouping method
|
Published Date | 2021-06-15
|
Publication Title |
ISIJ International
|
Volume | volume61
|
Issue | issue6
|
Publisher | Iron and Steel Institute of Japan
|
Start Page | 1775
|
End Page | 1783
|
ISSN | 0915-1559
|
NCID | AA10680712
|
Content Type |
Journal Article
|
language |
English
|
OAI-PMH Set |
岡山大学
|
Copyright Holders | © 2021 The Iron and Steel Institute of Japan.
|
File Version | publisher
|
DOI | |
Web of Science KeyUT | |
Related Url | isVersionOf https://doi.org/10.2355/isijinternational.ISIJINT-2020-688
|
License | https://creativecommons.org/licenses/by-nc-nd/4.0/
|