A bubble-induced turbulence model for gas-liquid bubbly flows in airlift columns, pipes and bubble columns

被引:14
作者
Shu, Shuli [1 ]
El Bahraoui, Naoufel [2 ,3 ]
Bertrand, Francois [1 ]
Chaouki, Jamal [1 ]
机构
[1] Polytech Montreal, Dept Chem Engn, POB 6079, Montreal, PQ H3C 3A7, Canada
[2] Setec, 42-52 Quai Rapee, F-75583 Paris, France
[3] Ecole Natl Super Mines, 60 Blvd St Michel, F-75006 Paris, France
基金
加拿大自然科学与工程研究理事会;
关键词
Bubble-induced turbulence; Computational fluid dynamics; Gas-liquid bubbly flows; Reynold stress modelling; Turbulence kinetic energy; CFD-SIMULATION; 2-PHASE FLOW; NUMERICAL-SIMULATION; PHASE DISTRIBUTION; SIZE DISTRIBUTION; MASS-TRANSFER; REACTORS; FORCE; HYDRODYNAMICS; VALIDATION;
D O I
10.1016/j.ces.2020.115945
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The presence of bubbles dramatically changes the liquid turbulence in bubbly flows. Modifications to liquid turbulent transport equations by adding source terms representing the effect of bubble-induced turbulence (BIT) are usually made to promote the reliability of Computational Fluid Dynamics simulations. However, existing closures for BIT fail to give reliable predictions of both mean flow properties and turbulence kinetic energy. In this work, a new BIT model, which embeds both the bubble swarm effects and the physics of bubble-induced vortices, is proposed to modify the Reynold stress model for bubbly flows. The anisotropy nature of BIT is also considered. The new BIT model can predict both mean flows and turbulence kinetic energy in airlift column systems, while investigated existing BIT models from the literature fail. Three simulation test cases for pipes and one for a bubble column have been conducted to show the validity of the proposed BIT model. (C) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页数:14
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