期刊
CHEMICAL ENGINEERING SCIENCE
卷 66, 期 22, 页码 5541-5555出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2011.07.020
关键词
Meso-scale; Fluidization; Bubble; Simulation; Hydrodynamics; Drag coefficient
资金
- Natural Science Foundation of China [20821092]
- MOST [2007AA050302-03, 2007DFA41320]
- Chinese Academy of Sciences [KGCX2-YW-222]
An EMMS/bubbling model for gas-solid bubbling fluidized bed was proposed based on the energy-minimization multi-scale (EMMS) method (Li and Kwauk, 1994). In this new model, the meso-scale structure was characterized with bubbles in place of clusters of the original EMMS method. Accordingly, the bubbling fluidized bed was resolved into the suspending and the energy-dissipation sub-systems over three sub-phases, i.e., the emulsion phase, the bubble phase and their inter-phase in-between. A stability condition of minimization of the energy consumption for suspending particles (N(5)-> min) was proposed, to close the hydrodynamic equations on these sub-phases. This bubble-based EMMS model has been validated and found in agreement with experimental data available in literature. Further, the unsteady-state version of the model was used to calculate the drag coefficient for two-fluid model (TFM). It was found that TFM simulation with EMMS/bubbling drag coefficient allows using coarser grid than that with homogeneous drag coefficient, resulting in both good predictability and scalability. (C) 2011 Elsevier Ltd. All rights reserved.
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