Journal
CHEMICAL ENGINEERING SCIENCE
Volume 92, Issue -, Pages 89-104Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2013.01.019
Keywords
Chemical reactors; Fluidization; Mathematical modelling; Multiphase flow; Meso-scale; Simulation
Categories
Funding
- Pakistan Institute of Engineering & Applied Sciences (PIEAS)
- National Basic Research Program of China [2012CB215003]
- National Natural Science Foundation of China [21176240, 21106157]
- Chinese Academy of Sciences [XDA07080100]
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Gas-solid systems, whether cocurrent or countercurrent, manifest meso-scale heterogeneity to some extent. However, most of the previous modelling efforts, including the study of the effects of meso-scale structures as well as relevant drag closures, are mainly focused on cocurrent up riser flows, leaving cocurrent down and countercurrent systems less explored. In this work, by extending drift flux analysis and experimental validation for cocurrent down and countercurrent flow systems, we show that the most commonly used homogeneous drag models may be successful in a certain range of operating conditions, especially with fine-grid resolution. Fine-grid resolution is indeed helpful for reliable simulation of coexisting states, by predicting concave slip velocity curves. By comparison, the energy minimization multiscale (EMMS) drag model allows the use of much coarser grid resolution and better prediction over wider range of operating conditions. Its predictability of the overall slip velocity as well as the drift flux is nearly grid independent over the entire range of voidage. This fact leads us to the obvious advantage of saving computational time. (C) 2013 Elsevier Ltd. All rights reserved.
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