Large-eddy simulation of gas–liquid two-phase flow in a bubble column reactor using a modified sub-grid scale model with the consideration of bubble-eddy interaction

Long, Shanshan and Yang, Jie and Huang, Xiaobing and Li, Guang and Shi, Weibin and Sommerfeld, Martin and Yang, Xiaogang (2020) Large-eddy simulation of gas–liquid two-phase flow in a bubble column reactor using a modified sub-grid scale model with the consideration of bubble-eddy interaction. International Journal of Heat and Mass Transfer, 161 . p. 120240. ISSN 00179310

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Abstract

The Eulerian–Eulerian Large-eddy simulations (LES) of gas–liquid two-phase flow in a cylindrical bubble column reactor have been conducted. When considering the turbulent eddy viscosity in LES, apart from the well-accepted contributions from shear turbulence and bubble induced turbulence (BIT), the effect of the interaction between entrained bubbles and eddies with a similar turbulence length scale to the sub-grid scale (SGS) cannot be neglected. With the consideration of the bubble response to the eddies on the induced sub-grid stresses, a modified SGS model, which incorporates the Stokes number, St, was proposed. The results of LES clearly indicate that the use of the modified SGS model can effectively capture the transient bubbly flow in the cylindrical bubble column. The power turbulent kinetic energy spectrum obtained in LES indicates that a slope similar to Komogorov -5/3 scaling law and the -3 scaling law can still be identified for a critical frequency f=10.70 Hz. © 2020 The Author(s)

Item Type: Article
Keywords: large-eddy simulation; sub-grid scale model; bubble column; turbulence modelling
Schools/Departments: University of Nottingham Ningbo China > Faculty of Science and Engineering > School of Mathematical Sciences
University of Nottingham Ningbo China > Faculty of Science and Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: https://doi.org/10.1016/j.ijheatmasstransfer.2020.120240
Depositing User: QIU, Lulu
Date Deposited: 28 Aug 2020 01:09
Last Modified: 28 Aug 2020 01:09
URI: http://eprints.nottingham.ac.uk/id/eprint/61478

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