Asiagbe, KS orcid.org/0000-0001-6957-8597, Fairweather, M, Njobuenwu, DO et al. (1 more author) (2019) Large eddy simulation of microbubble dispersion and flow field modulation in vertical channel flows. AIChE Journal, 65 (4). pp. 1325-1339. ISSN 0001-1541
Abstract
Turbulent liquid–gas vertical channel flows laden with microbubbles are investigated using large eddy simulation (LES) two‐way coupled to a Lagrangian bubble tracking technique. Upward and downward flows at shear Reynolds numbers of Re τ = 150 and 590 are analyzed for three different microbubble diameters of 110, 220, and 330 μm. Predicted results are compared with published direct numerical simulation results although, with respect to comparable studies available in the literature, the range of bubble diameters and shear Reynolds numbers considered herein is extended to larger values. Microbubble concentration profiles are analyzed, with the microbubbles segregating at the wall in upflow conditions and moving toward the channel centre in downflow. The various forces acting on the bubbles, and the effect of the flow turbulence on the bubble concentration, are considered and quantified. Overall, the results suggest that the level of detail achievable with LES is sufficient to predict the fluid structures impacting bubble behavior. Therefore, LES coupled with Lagrangian bubble tracking shows promise for enabling the reliable prediction of bubble‐laden flows that are of industrial relevance.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 American Institute of Chemical Engineers. This is the peer reviewed version of the following article: Asiagbe, K. S., Fairweather, M. , Njobuenwu, D. O. and Colombo, M. (2019), Large eddy simulation of microbubble dispersion and flow field modulation in vertical channel flows. AIChE J., which has been published in final form at https://doi.org/10.1002/aic.16509. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Eulerian–Lagrangian; large eddy simulation; microbubbles; turbulence modulation; vertical channel flows |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Feb 2019 14:49 |
Last Modified: | 21 Dec 2019 01:39 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/aic.16509 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:142053 |