CIESC Journal ›› 2018, Vol. 69 ›› Issue (1): 389-395.doi: 10.11949/j.issn.0438-1157.20170830

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Effects of drag model and turbulence model on simulation of air-lift internal-loop reactor

ZHANG Jiabao1,2, CUI Lijie1, YANG Ning2   

  1. 1 School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    2 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2017-06-28 Revised:2017-08-03 Online:2018-01-05 Published:2017-08-07
  • Contact: 10.11949/j.issn.0438-1157.20170830 E-mail:nyang@ipe.ac.cn
  • Supported by:

    supported by the National Key Research and Development Program of China (2017YFB0602500) and the National Natural Science Foundation of China (91434121, 91634203).

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Abstract:

The influence of drag models and turbulence models on the hydrodynamic parameters in an air-lift internal-loop reactor is evaluated. Drag models determine the existence of gas in downcomer, and drag models and turbulence models jointly determine the accuracy of the simulation of gas holdup. Using uniform size bubbles, the Schiller-Naumann, Tomiyama, Grace and Ishii-Zuber drag models are only suitable for lower superficial gas velocity, and there is no gas in downcomer. The capability of DBS-Local drag model was confirmed. Compared with the other four drag models, only DBS-Local drag model can predict the existence of gas in downcomer. DBS-Local drag model combining with the standard k-ε mixture turbulence model can well predict gas holdup, and combining with RNG k-ε dispersed turbulence model can better predict liquid velocity.

Key words: CFD, internal-loop reactor, gas-liquid flow, drag model, turbulence model, gas holdup

CLC Number: 

  • TQ021.1

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