TY - JOUR
T1 - Single-bubble fragmentation in a mechanically stirred liquid bath under trailing vortex conditions
AU - Yamamoto, Takuya
AU - Komarov, Sergey V.
N1 - Funding Information:
This work was supported partly by the Initiative on Promotion of Supercomputing for Young or Women Researchers, Supercomputing Division, Information Technology Center, The University of Tokyo , and partly by Aluminium research grant from the Japan Aluminium Association .
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/11/2
Y1 - 2019/11/2
N2 - We investigated the mechanism of single-bubble fragmentation during mechanical stirring under different trailing vortex conditions. Experiments and numerical simulations using the LES-VOF method were carried out under different bubble sizes and locations of bubble injection. We found that the following three phenomena can cause bubble fragmentation: collision with impeller blade; shear stress in the boundary layer ahead of the impeller blade; and interaction between trailing vortices and the bubble. In the last case, the mechanism of fragmentation can be categorized into six types, which are determined by the relationship between the bubble behavior and the trailing vortices. Thus, we clarified the relationship between trailing vortices and bubble fragmentation for the first time in a stirred vessel.
AB - We investigated the mechanism of single-bubble fragmentation during mechanical stirring under different trailing vortex conditions. Experiments and numerical simulations using the LES-VOF method were carried out under different bubble sizes and locations of bubble injection. We found that the following three phenomena can cause bubble fragmentation: collision with impeller blade; shear stress in the boundary layer ahead of the impeller blade; and interaction between trailing vortices and the bubble. In the last case, the mechanism of fragmentation can be categorized into six types, which are determined by the relationship between the bubble behavior and the trailing vortices. Thus, we clarified the relationship between trailing vortices and bubble fragmentation for the first time in a stirred vessel.
KW - Bubble fragmentation
KW - Large eddy simulation
KW - Mechanical stirring
KW - OpenFOAM
KW - Volume of fluid method
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U2 - 10.1016/j.ces.2019.07.019
DO - 10.1016/j.ces.2019.07.019
M3 - Article
AN - SCOPUS:85068974128
SN - 0009-2509
VL - 207
SP - 1007
EP - 1016
JO - Chemical Engineering Science
JF - Chemical Engineering Science
ER -