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Evaluation of drag models for cocurrent and countercurrent gas-solid flows
Ullah, Atta1,2; Wang, Wei1; Li, Jinghai1
2013-04-05
Source PublicationCHEMICAL ENGINEERING SCIENCE
Volume92Issue:0Pages:89-104
AbstractGas-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.
KeywordChemical Reactors Fluidization Mathematical Modelling Multiphase Flow Meso-scale Simulation
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
Language英语
WOS KeywordCIRCULATING FLUIDIZED-BED ; MULTISCALE CFD APPROACH ; FULLY-DEVELOPED REGION ; PARTICLE FLOW ; NUMERICAL-SIMULATION ; RISER REACTORS ; DOWNER REACTOR ; KINETIC-THEORY ; 2-FLUID MODEL ; EMMS APPROACH
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000316670400007
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13379
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, EMMS Grp, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Ullah, Atta,Wang, Wei,Li, Jinghai. Evaluation of drag models for cocurrent and countercurrent gas-solid flows[J]. CHEMICAL ENGINEERING SCIENCE,2013,92(0):89-104.
APA Ullah, Atta,Wang, Wei,&Li, Jinghai.(2013).Evaluation of drag models for cocurrent and countercurrent gas-solid flows.CHEMICAL ENGINEERING SCIENCE,92(0),89-104.
MLA Ullah, Atta,et al."Evaluation of drag models for cocurrent and countercurrent gas-solid flows".CHEMICAL ENGINEERING SCIENCE 92.0(2013):89-104.
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