Chinese Journal of Chemical Engineering ›› 2021, Vol. 29 ›› Issue (1): 27-34.doi: 10.1016/j.cjche.2020.07.057

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

EMMS-based modeling of gas-solid generalized fluidization: Towards a unified phase diagram

Juanbo Liu1,2, Xinhua Liu1,3, Wei Ge1,2,3   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Dalian National Laboratory for Clean Energy, Dalian 116023, China
  • Received:2020-05-04 Revised:2020-06-19 Online:2021-01-28 Published:2021-04-02
  • Contact: Xinhua Liu, Wei Ge;
  • Supported by:
    We would like to thank financial supports from the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA21040400), the Innovation Academy for Green manufacture, the Chinese Academy of Sciences (IAGM-2019-A03) and the National Natural Science Foundation of China (91834303).

Abstract: Hydrodynamic features of gas-solid generalized fluidization can be well expressed in the form of phase diagrams, which are important for engineering design. Mesoscale structure presents almost universally in generalized fluidization and should be considered in such phase diagrams. However, current phase diagrams were mainly proposed for cocurrent upward flow according to experimental data or empirical correlations with homogeneous assumption. The energy-minimization multiscale (EMMS) model has shown the capability of capturing mesoscale structure in generalized fluidization, so EMMS-based phase diagrams of generalized fluidization were proposed in this article, which describe more reasonable global hydrodynamics over all regimes including the important engineering phenomena of choking and flooding. These characteristics were also found in discrete particle simulation under various conditions. For wider range of application, the typical hydrodynamic parameters of the phase diagrams were correlated to non-dimensional numbers reflecting the effects of material properties and operation conditions. This study thus shows a possible route to develop a unified phase diagram in the future.

Key words: Fluidization, Phase diagram, Dimensionless correlation, Mesoscale, Mathematical modeling, EMMS