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Euler/Euler large eddy simulation of bubbly flow in bubble columns under CO2 chemisorption conditions

Long, Shanshan; Yang, Xiaogang; Yang, Jie; Sommerfeld, Martin

Authors

Shanshan Long

Xiaogang Yang

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Dr Jie Yang Jie.Yang@hull.ac.uk
Lecturer in Applied Mathematics

Martin Sommerfeld



Abstract

It has been generally recognised that the turbulent dispersion force plays an important role in interphase momentum transfer. However, the effect of the added mass stress on the momentum and mass transfer in bubble column bubbly flow has not been addressed appropriately. As the turbulent eddies in the surroundings of bubbles interact strongly with the rising bubbles in bubble column bubbly flow, such interactions will bring out the change of interfacial areas between the bubbles and carrier fluid, consequently leading to changes in the interfacial mass transfer. When employing large eddy simulation for modelling bubbly flow coupled with the chemisorption process, the SGS filtered velocity fluctuations of liquid phase can be interpreted as the turbulent eddies that continuously hit the surfaces of bubbles, causing bubble deformation and the variation of bubble interfacial areas, which give rise to the turbulent dispersion and added mass stress forces. The present study will demonstrate through Euler/Euler large-eddy simulations (LES) modelling that by considering the turbulent dispersion force (SGS-TDF) and added mass stress (SGS-AMS), the bubble dynamics and mass transfer under the chemisorption conditions can be better indicated, which leads to remarkable improvements in the prediction of bubble lateral dispersion and the interfacial mass transfer. The turbulent dispersion and added mass stress related to the spatially filtering were proposed with a modification on SGS eddy viscosity to reflect turbulent dispersion due to bubble-induced turbulence. A comprehensive assessment of the effects of these additional filtered stress terms on the time-averaged velocity and bubble volume fraction profiles, flow patterns, mass transfer and the pH variation during CO2 chemisorption and the turbulent kinetic energy and species concentration spectra was conducted.

Citation

Long, S., Yang, X., Yang, J., & Sommerfeld, M. (2022). Euler/Euler large eddy simulation of bubbly flow in bubble columns under CO2 chemisorption conditions. Chemical Engineering Journal, 445, Article 136654. https://doi.org/10.1016/j.cej.2022.136654

Journal Article Type Article
Acceptance Date Apr 26, 2022
Online Publication Date Apr 30, 2022
Publication Date 2022-10
Deposit Date May 6, 2022
Publicly Available Date May 12, 2022
Journal Chemical Engineering Journal
Print ISSN 1385-8947
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 445
Article Number 136654
DOI https://doi.org/10.1016/j.cej.2022.136654
Keywords LES Simulation; Turbulent Dispersion; Added Mass Stress; Mass Transfer; Bubble Column
Public URL https://hull-repository.worktribe.com/output/3988430

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