Multiscale Simulation of Bubbly Flows

Asiagbe, Kenneth S.; Fairweather, Michael; Njobuenwu, Derrick O.; Colombo, Marco

doi:10.1016/b978-0-444-63428-3.50109-0

Cited by 1 publication

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“…In a liquid–gas turbulent flow, the large‐scale turbulent structures interact with the bubbles and are responsible for the macroscopic bubble motion, while small‐scale turbulent structures only captured in LES, and the less energetic small scales are approximated using a subgrid‐scale (SGS) model, coupling of bubble tracking technique and LES can in principle reproduce the large scale motion responsible for the bubble motion. In our previous works, an LES Eulerian–Lagrangian model was successfully applied to horizontal channel flows and its initial application to a vertical channel flow was investigated . In these studies, LES was demonstrated to achieve a level of detail sufficient to predict bubbly flows with accuracy.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of microbubble dispersion and flow field modulation in vertical channel flows

et al. 2019

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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. © 2018 American Institute of Chemical Engineers AIChE J, 65: 1325–1339, 2019

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Section: Introductionmentioning

confidence: 99%