Free-surface vortex formation and aeration by a submerged rotating disk

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We investigate the characteristics of free-surface vortex (FSV) formation and aeration processes in a self-ingested reactor. A disk with a protruded ridge rotating in a water tank is used as a simplified model. First, flow velocity fields on the FSV surface and the disk are obtained analytically using a semi-empirical method. From the bottom view of the impeller, we observe bubbles separated from two air pockets formed behind the ridge as the interface of the air pockets becomes fluctuated. Then, void fraction distribution along the vertical direction by rising bubbles is established theoretically and confirmed by experimental measurements. These results and the measured total void fraction data of the tank are used to show that the turbulence cascade energy near the disk is converted into the surface tension energy of bubbles and is responsible for aeration.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2021-11
Language
English
Article Type
Article
Citation

CHEMICAL ENGINEERING SCIENCE, v.243

ISSN
0009-2509
DOI
10.1016/j.ces.2021.116787
URI
http://hdl.handle.net/10203/285913
Appears in Collection
ME-Journal Papers(저널논문)
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