The transition to aeration in turbulent two-phase mixing in stirred vessels
- Authors
- Kahouadji, L.; Liang, F.; Valdes, J.P.; Shin, S.; Chergui, J.; Juric, D.; Craster, R.V.; Matar, O.K.
- Issue Date
- 21-Oct-2022
- Publisher
- Cambridge University Press
- Keywords
- Aeration; Fast-moving consumer goods; Multiphase mixing; Stirred vessels; Turbulence
- Citation
- Flow, v.2
- Journal Title
- Flow
- Volume
- 2
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/30598
- DOI
- 10.1017/flo.2022.24
- ISSN
- 2633-4259
- Abstract
- We consider the mixing dynamics of an air-liquid system driven by the rotation of a pitched blade turbine (PBT) inside an open, cylindrical tank. To examine the flow and interfacial dynamics, we use a highly parallelised implementation of a hybrid front-tracking/level-set method that employs a domain-decomposition parallelisation strategy. Our numerical technique is designed to capture faithfully complex interfacial deformation, and changes of topology, including interface rupture and dispersed phase coalescence. As shown via transient, a three-dimensional (3-D) LES (large eddy simulation) using a Smagorinsky-Lilly turbulence model, the impeller induces the formation of primary vortices that arise in many idealised rotating flows as well as several secondary vortical structures resembling Kelvin-Helmholtz, vortex breakdown, blade tip vortices and end-wall corner vortices. As the rotation rate increases, a transition to 'aeration' is observed when the interface reaches the rotating blades leading to the entrainment of air bubbles into the viscous fluid and the creation of a bubbly, rotating, free surface flow. The mechanisms underlying the aeration transition are probed as are the routes leading to it, which are shown to exhibit a strong dependence on flow history. ©
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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