A dual-scale turbulence model for gas-liquid bubbly flows

doi:10.1016/j.cjche.2015.09.003

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (11): 1737-1745.DOI: 10.1016/j.cjche.2015.09.003

• 流体力学与传递现象 • 下一篇

A dual-scale turbulence model for gas-liquid bubbly flows

Xiaoping Guan, Zhaoqi Li, Lijun Wang, Xi Li, Youwei Cheng

College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China

收稿日期:2015-01-12 修回日期:2015-05-10 出版日期:2015-11-28 发布日期:2015-12-18
通讯作者: Lijun Wang
基金资助:
Supported by the National Natural Science Foundation of China (U1162125, U1361112) and the National High Technology Research and Development Program of China (2011AA05A205).

A dual-scale turbulence model for gas-liquid bubbly flows

Xiaoping Guan, Zhaoqi Li, Lijun Wang, Xi Li, Youwei Cheng

College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China

Received:2015-01-12 Revised:2015-05-10 Online:2015-11-28 Published:2015-12-18
Contact: Lijun Wang
Supported by:
Supported by the National Natural Science Foundation of China (U1162125, U1361112) and the National High Technology Research and Development Program of China (2011AA05A205).

摘要/Abstract

摘要： A dual-scale turbulence model is applied to simulate cocurrent upward gas-liquid bubbly flows and validated with available experimental data. In the model, liquid phase turbulence is split into shear-induced and bubbleinduced turbulence. Single-phase standard k-ε model is used to compute shear-induced turbulence and another transport equation is added to model bubble-induced turbulence. In the latter transport equation, energy loss due to interface drag is the production term, and the characteristic length of bubble-induced turbulence, simply the bubble diameter in this work, is introduced to model the dissipation term. The simulated results agree well with experimental data of the test cases and it is demonstrated that the proposed dual-scale turbulence model outperforms other models. Analysis of the predicted turbulence shows that themain part of turbulent kinetic energy is the bubble-induced one while the shear-induced turbulent viscosity predominates within turbulent viscosity, especially at the pipe center. The underlying reason is the apparently different scales for the two kinds of turbulence production mechanisms: the shear-induced turbulence is on the scale of the whole pipe while the bubble-induced turbulence is on the scale of bubble diameter. Therefore, the model reflects the multi-scale phenomenon involved in gas-liquid bubbly flows.

关键词: Two-fluid model, Dual-scale turbulence model, Shear-induced turbulence, Bubble-induced turbulence, Bubbly flow

Abstract: A dual-scale turbulence model is applied to simulate cocurrent upward gas-liquid bubbly flows and validated with available experimental data. In the model, liquid phase turbulence is split into shear-induced and bubbleinduced turbulence. Single-phase standard k-ε model is used to compute shear-induced turbulence and another transport equation is added to model bubble-induced turbulence. In the latter transport equation, energy loss due to interface drag is the production term, and the characteristic length of bubble-induced turbulence, simply the bubble diameter in this work, is introduced to model the dissipation term. The simulated results agree well with experimental data of the test cases and it is demonstrated that the proposed dual-scale turbulence model outperforms other models. Analysis of the predicted turbulence shows that themain part of turbulent kinetic energy is the bubble-induced one while the shear-induced turbulent viscosity predominates within turbulent viscosity, especially at the pipe center. The underlying reason is the apparently different scales for the two kinds of turbulence production mechanisms: the shear-induced turbulence is on the scale of the whole pipe while the bubble-induced turbulence is on the scale of bubble diameter. Therefore, the model reflects the multi-scale phenomenon involved in gas-liquid bubbly flows.

Key words: Two-fluid model, Dual-scale turbulence model, Shear-induced turbulence, Bubble-induced turbulence, Bubbly flow

Xiaoping Guan, Zhaoqi Li, Lijun Wang, Xi Li, Youwei Cheng. A dual-scale turbulence model for gas-liquid bubbly flows[J]. Chinese Journal of Chemical Engineering, 2015, 23(11): 1737-1745.

Xiaoping Guan, Zhaoqi Li, Lijun Wang, Xi Li, Youwei Cheng. A dual-scale turbulence model for gas-liquid bubbly flows[J]. Chin.J.Chem.Eng., 2015, 23(11): 1737-1745.

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A dual-scale turbulence model for gas-liquid bubbly flows

A dual-scale turbulence model for gas-liquid bubbly flows

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