A study on liquid-liquid dispersions in a continuous mixer via computational fluid dynamics (CFD) simulation combined with population balance model (PBM)

被引:14
|
作者
Tang, Qiao [1 ]
Ye, Sishi [1 ]
Wang, Yundong [1 ]
Liu, Zuohua [2 ]
机构
[1] Tsinghua Univ, Dept Chem Engn, State Key Lab Chem Engn, Beijing 100084, Peoples R China
[2] Chongqing Univ, Sch Chem & Chem Engn, Chongqing 400044, Peoples R China
来源
CANADIAN JOURNAL OF CHEMICAL ENGINEERING | 2019年 / 97卷 / 02期
基金
中国国家自然科学基金;
关键词
mixer; liquid-liquid; flow characteristics; CFD; PBM; BREAK-UP; DROPLET BREAKAGE; MASS-TRANSFER; 2-PHASE FLOW; COALESCENCE; HYDRODYNAMICS;
D O I
10.1002/cjce.23361
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Liquid-liquid two-phase flow in a mixer of mixer-settler has been studied via a computational fluid dynamics (CFD) simulation combined with the population balance model (PBM) and verified with particle image velocimetry (PIV) experiments. The simulation was performed using the multiple reference frame (MRF) approach, the Eulerian-Eulerian two-fluid model, and the standard k-epsilon model. The effects of impeller speed, flow ratio, and impeller type on flow field, droplet diameter, and dispersed phase holdup were investigated. The results showed that CFD simulation combined with PBM could predict droplet size distribution (DSD). The smaller droplets were mainly in the bottom region of the mixer, larger ones were in the top part of the mixer, and the largest droplets appeared in the impeller centre region. The DSD and holdup were more sensitive to impeller speed than to the organic/aqueous flow ratio. A dual-impeller mixer configuration was designed to enhance the mixing performance. Compared with single-impeller, the installation of dual-impellers could effectively avoid the dispersed phase dead zone above the lower impeller. When h(c) /T = 0.3, the best dispersing effect, such as uniform DSD and high mixing chamber space utilization, could be obtained.
引用
收藏
页码:452 / 464
页数:13
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