CIESC Journal ›› 2021, Vol. 72 ›› Issue (4): 1965-1974.DOI: 10.11949/0438-1157.20200928

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Numerical simulation of liquid-liquid two-phase flow in tubular mixer-settler

LAN Minle1,4(),TAN Boren1,4,XU Dongbing1,2,WANG Yong1,2,3(),QI Tao1,2,3   

  1. 1.Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
    2.Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
    3.Institute of Rare Earths, Chinese Academy of Sciences, Ganzhou 341000, Jiangxi, China
    4.University of Chinese Academy of Sciences, Beijing 100190, China
  • Received:2020-07-13 Revised:2020-10-10 Online:2021-04-05 Published:2021-04-05
  • Contact: WANG Yong

管型混合澄清槽内的液-液两相流的数值模拟

蓝敏乐1,4(),谭博仁1,4,许东兵1,2,王勇1,2,3(),齐涛1,2,3   

  1. 1.中国科学院过程工程研究所,北京 100190
    2.中国科学院绿色过程制造创新研究院,北京 100190
    3.中国科学院稀土研究院,江西 赣州 341000
    4.中国科学院大学,北京 101400
  • 通讯作者: 王勇
  • 作者简介:蓝敏乐(1996—),男,硕士研究生,thu_lml@163.com
  • 基金资助:
    赣州市人民政府-中国科学院绿色过程制造创新研究院稀土产业基金项目(IAGM 2020DA02);国家重点研发计划项目(2019YFC1907700)

Abstract:

The tubular mixer-settler has a broad application prospect in industrial production. A tubular mixer settler was simulated by using computational fluid dynamics (CFD). The effects of dispersed phase droplet size (d32 = 100—500 μm), oil-water ratio (O∶A = 1∶1—1∶5), inlet baffle position on the mixing and settle performance of tubular mixer-settler were systematically investigated. The simulation results were compared with those of traditional square mixer-settler. The results show that the flow field distribution in the tubular mixer chamber is better than that in the square mixer chamber, in which the flow dead zone is not easy to generate. In the tubular mixer chamber, a lower pressure zone is formed above and below the impeller, and the turbulent kinetic energy of the fluid is higher. The mixing performance can be improved by reducing d32 of dispersed phase and oil-water ratio of feed. In the tubular settler, increasing the dispersed phase d32 and reducing the feed oil-water ratio can improve the clarification performance, and the inlet baffle can effectively improve the clarification performance.

Key words: numerical simulation, computational fluid dynamics, extraction, two-phase flow

摘要:

管型混合澄清槽在工业生产中具有广阔的应用前景。通过计算流体力学分别对管型混合澄清槽内的混合室和澄清室进行数值模拟,系统地探究了分散相液滴尺寸(d32= 100~500 μm)、进料油水比(O∶A = 1∶1~1∶5)、入口挡板及入口位置对混合澄清效果的影响,并将模拟结果与传统方型混合澄清槽进行对比。结果表明,管型混合室内的流场分布更合理,不易形成流动死区。管型混合室内搅拌桨上方和下方形成压力更小的低压区,流体的湍动能更大,搅拌性能更好。在混合室中,降低分散相d32和进料油水比能够提高混合性能。在澄清室中,提高分散相d32和降低进料油水比能够提高澄清性能,入口挡板能够有效提高澄清性能。

关键词: 数值模拟, 计算流体力学, 萃取, 两相流

CLC Number: