SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 47 ›› Issue (7): 79-88.DOI: 10.1016/j.cjche.2021.06.009

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Study on the solid–liquid suspension behavior in a tank stirred by the long-short blades impeller

Zewen Chen1, Yongjun Wu1, Jian Wang2, Peicheng Luo1,3   

  1. 1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China;
    2. Beijing System Engineering Institute, Beijing 100034, China;
    3. CAS Key Laboratory Of Energy Regulation Materials, Shanghai 200032, China
  • Received:2021-03-31 Revised:2021-06-22 Online:2022-08-19 Published:2022-07-28
  • Contact: Peicheng Luo,E-mail:luopeicheng@seu.edu.cn
  • Supported by:
    We acknowledge the financial support from the National Natural Science Foundation of China (22078058) and Open Research Fund Program of CAS Key Laboratory of Energy Regulation Materials (ORFP2020-02). We also thank the Big Data Center of Southeast University for providing the facility support on the numerical simulations in this work.

Study on the solid–liquid suspension behavior in a tank stirred by the long-short blades impeller

Zewen Chen1, Yongjun Wu1, Jian Wang2, Peicheng Luo1,3   

  1. 1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China;
    2. Beijing System Engineering Institute, Beijing 100034, China;
    3. CAS Key Laboratory Of Energy Regulation Materials, Shanghai 200032, China
  • 通讯作者: Peicheng Luo,E-mail:luopeicheng@seu.edu.cn
  • 基金资助:
    We acknowledge the financial support from the National Natural Science Foundation of China (22078058) and Open Research Fund Program of CAS Key Laboratory of Energy Regulation Materials (ORFP2020-02). We also thank the Big Data Center of Southeast University for providing the facility support on the numerical simulations in this work.

Abstract: We investigated the solid-liquid suspension characteristics in the tank with a liquid height/tank diameter ratio of 1.5 stirred by a novel long-short blades (LSB) impeller by the Euler granular flow model coupled with the standard k-ε turbulence model. After validation of the local solid holdup by experiments, numerical predictions have been successfully used to explain the influences of impeller rotating speed, particle density, particle size, liquid viscosity and initial solid loading on the solid suspension behavior, i.e. smaller particles with lower density are more likely to be suspended evenly in the liquid with higher liquid viscosity. At a low impeller rotating speed (N), increase in N leads to an obvious improvement in the solid distribution homogeneity. Moreover, the proposed LSB impeller has obvious advantages in the uniform distribution of the solid particles compared with single Rushton turbine (RT), dual RT impellers or CBY hydrofoil impeller under the same power consumption.

Key words: Two-phase flow, Computational fluid dynamics, Kinetic theory of granular flow, Stirred tank, Long-short blades impeller

摘要: We investigated the solid-liquid suspension characteristics in the tank with a liquid height/tank diameter ratio of 1.5 stirred by a novel long-short blades (LSB) impeller by the Euler granular flow model coupled with the standard k-ε turbulence model. After validation of the local solid holdup by experiments, numerical predictions have been successfully used to explain the influences of impeller rotating speed, particle density, particle size, liquid viscosity and initial solid loading on the solid suspension behavior, i.e. smaller particles with lower density are more likely to be suspended evenly in the liquid with higher liquid viscosity. At a low impeller rotating speed (N), increase in N leads to an obvious improvement in the solid distribution homogeneity. Moreover, the proposed LSB impeller has obvious advantages in the uniform distribution of the solid particles compared with single Rushton turbine (RT), dual RT impellers or CBY hydrofoil impeller under the same power consumption.

关键词: Two-phase flow, Computational fluid dynamics, Kinetic theory of granular flow, Stirred tank, Long-short blades impeller