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Extending the bubble-based EMMS model to CFB riser simulations
Alternative TitlePowder Technol.
Hong, Kun1,2; Shi, Zhansheng2,3; Ullah, Atta2,4; Wang, Wei2
2014-11-01
Source PublicationPOWDER TECHNOLOGY
ISSN0032-5910
Volume266Issue:11mPages:424-432
AbstractExperiments have shown that various structures (e.g., the streamer, cluster, void and bubble) can be clearly observed in gas-solid fluidized beds. These structures affect the overall behavior of flow, mass/heat transfer and reactions significantly and should be accounted for in simulations of gas-solid flow. For the purpose of riser flow simulation, the structure-based drag model has already been proposed based on the description of meso-scale clusters, and incorporated into the framework of a two-fluid model to calculate the effective drag force. However, there is still no clear agreement about the characterization of clusters, such as the cluster shape, size and orientation. In contrast, it is easier to describe and measure the characteristic size of visible bubbles. Here, we attempt to upgrade the bubble-based EMMS model which was established for bubbling fluidized beds originally, and then extend it to simulations of heterogeneous gas-solid flows in CFB risers. Numerical analysis on this new model reveals that it is capable of predicting two turning points, where the flow state is transforming rapidly from uniform to heterogeneous distribution. The predicted voidage in the dense phase is qualitatively consistent with experimental data in the literature. To evaluate this new drag, finally, CFB riser simulations have been carried out by coupling of the two-fluid model and the bubble-based EMMS drag. The results show good agreement with experimental data. (C) 2014 Elsevier B.V. All rights reserved.; Experiments have shown that various structures (e.g., the streamer, cluster, void and bubble) can be clearly observed in gas-solid fluidized beds. These structures affect the overall behavior of flow, mass/heat transfer and reactions significantly and should be accounted for in simulations of gas-solid flow. For the purpose of riser flow simulation, the structure-based drag model has already been proposed based on the description of meso-scale clusters, and incorporated into the framework of a two-fluid model to calculate the effective drag force. However, there is still no clear agreement about the characterization of clusters, such as the cluster shape, size and orientation. In contrast, it is easier to describe and measure the characteristic size of visible bubbles. Here, we attempt to upgrade the bubble-based EMMS model which was established for bubbling fluidized beds originally, and then extend it to simulations of heterogeneous gas-solid flows in CFB risers. Numerical analysis on this new model reveals that it is capable of predicting two turning points, where the flow state is transforming rapidly from uniform to heterogeneous distribution. The predicted voidage in the dense phase is qualitatively consistent with experimental data in the literature. To evaluate this new drag, finally, CFB riser simulations have been carried out by coupling of the two-fluid model and the bubble-based EMMS drag. The results show good agreement with experimental data. (C) 2014 Elsevier B.V. All rights reserved.
KeywordCirculating Fluidized Bed Multi-scale Structure Bubble Emms Simulation
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.powtec.2014.06.064
URL查看原文
Indexed BySCI
Language英语
WOS KeywordSOLID FLUIDIZED-BEDS ; MESOSCALE STRUCTURES ; SUBGRID MODEL ; 2-PHASE FLOW ; EQUATIONS ; CLUSTERS ; DENSITY ; REACTOR ; DRAG
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000341221800049
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11402
Collection研究所(批量导入)
Affiliation1.Huaiyin Inst Technol, Coll Life Sci & Chem Engn, Huaian 223003, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
3.Natl Inst Clean & Low Carbon Energy, Beijing 102209, Peoples R China
4.Pakistan Inst Engn & Appl Sci, Dept Chem Engn, Islamabad 45650, Pakistan
Recommended Citation
GB/T 7714
Hong, Kun,Shi, Zhansheng,Ullah, Atta,et al. Extending the bubble-based EMMS model to CFB riser simulations[J]. POWDER TECHNOLOGY,2014,266(11m):424-432.
APA Hong, Kun,Shi, Zhansheng,Ullah, Atta,&Wang, Wei.(2014).Extending the bubble-based EMMS model to CFB riser simulations.POWDER TECHNOLOGY,266(11m),424-432.
MLA Hong, Kun,et al."Extending the bubble-based EMMS model to CFB riser simulations".POWDER TECHNOLOGY 266.11m(2014):424-432.
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