- Title
- Influence of void fraction calculation on fidelity of CFD-DEM simulation of gas-solid bubbling fluidized beds
- Creator
- Peng, Zhengbiao; Doroodchi, Elham; Luo, Caimao; Moghtaderi, Behdad
- Relation
- ARC
- Relation
- AIChE Journal Vol. 60, Issue 6, p. 2000-2018
- Publisher Link
- http://dx.doi.org/10.1002/aic.14421
- Publisher
- John Wiley & Sons
- Resource Type
- journal article
- Date
- 2014
- Description
- The correct calculation of cell void fraction is pivotal in accurate simulation of two-phase flows using a computational fluid dynamics-discrete element method (CFD-DEM) approach. Two classical approaches for void fraction calculations (i.e., particle centroid method or PCM and analytical approach) were examined, and the accuracy of these methodologies in predicting the particle-fluid flow characteristics of bubbling fluidized beds was investigated. It was found that there is a critical cell size (3.82 particle diameters) beyond which the PCM can achieve the same numerical stability and prediction accuracy as those of the analytical approach. There is also a critical cell size (1/19.3 domain size) below which meso-scale flow structures are resolved. Moreover, a lower limit of cell size (1.63 particle diameters) was identified to satisfy the assumptions of CFD-DEM governing equations. A reference map for selecting the ideal computational cell size and the suitable approach for void fraction calculation was subsequently developed.
- Subject
- CFD; fluidization; numerical solutions; particulate flows; solids processing
- Identifier
- http://hdl.handle.net/1959.13/1302690
- Identifier
- uon:20522
- Identifier
- ISSN:0001-1541
- Language
- eng
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