CAS OpenIR  > 多相复杂系统国家重点实验室
A review of multiscale CFD for gas-solid CFB modeling
Wang, Wei1; Lu, Bona; Zhang, Nan; Shi, Zhansheng; Li, Jinghai; Wang, W
2010-02-01
Source PublicationINTERNATIONAL JOURNAL OF MULTIPHASE FLOW
ISSN0301-9322
Volume36Issue:2Pages:109-118
AbstractMeso-scale structure is of critical importance to circulating fluidized bed (CFB) applications. Computational fluid dynamics (CFD) with consideration of meso-scale structures can help understand the structure-oriented coupling between flow, heat/mass transfer and reactions. This article is to review our recent progress on the so-called multiscale CFD (MSCFD), which characterizes the sub-grid meso-scale structure with stability criteria in addition to conservation equations. It is found that the mesh-independent solution of fine-grid two-fluid model (TFM) without sub-grid structures is inexact, in the sense that it overestimates the drag coefficient and fails to capture the characteristic S-shaped axial profile of voidage in a CFB riser. By comparison, MSCFD approach in terms of EMMS/matrix seems to reach a mesh-independent solution of the sub-grid structure, and succeeds in predicting the axial profile and flow regime transitions. Further application of MSCFD finds that neglect of geometric factors is one of the major reasons that cause disputes in understanding the flow regime transitions in a CFB. The operating diagram should, accordingly, include geometric factors besides commonly believed operating parameters for the intrinsic flow regime diagram. Recent extension of MSCFD to mass transfer finds that Reynolds number is insufficient for correlating the overall Sherwood number in a CFB. This is believed the main reason why the conventional correlations of Sherwood number scatter by several orders of magnitude. Certain jump change of state of motion around Reynolds number of 50-100 can be expected to clarify the abrupt decay of Sherwood number in both classical- and circulating-fluidized beds. Finally, we expect that the real-size, 3-D, full-loop. time-dependent multiscale simulation of CFB is an emerging paradigm that will realize virtual experiment of CFBs. (C) 2009 Elsevier Ltd. All rights reserved.
KeywordMeso-scale Multiscale Cfd Simulation Fluidized Bed Structure Mass Transfer
SubtypeReview
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.ijmultiphaseflow.2009.01.008
Indexed BySCI
Language英语
WOS KeywordCIRCULATING FLUIDIZED-BED ; MASS-TRANSFER MODEL ; KINETIC-THEORY ; EMMS APPROACH ; RISER FLOWS ; SIMULATION ; SYSTEMS ; CHOKING ; HYDRODYNAMICS ; REACTOR
WOS Research AreaMechanics
WOS SubjectMechanics
WOS IDWOS:000274972200003
Citation statistics
Cited Times:101[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6218
Collection多相复杂系统国家重点实验室
Corresponding AuthorWang, W
Affiliation1.Chinese Acad Sci, Inst Proc Engn, 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
Wang, Wei,Lu, Bona,Zhang, Nan,et al. A review of multiscale CFD for gas-solid CFB modeling[J]. INTERNATIONAL JOURNAL OF MULTIPHASE FLOW,2010,36(2):109-118.
APA Wang, Wei,Lu, Bona,Zhang, Nan,Shi, Zhansheng,Li, Jinghai,&Wang, W.(2010).A review of multiscale CFD for gas-solid CFB modeling.INTERNATIONAL JOURNAL OF MULTIPHASE FLOW,36(2),109-118.
MLA Wang, Wei,et al."A review of multiscale CFD for gas-solid CFB modeling".INTERNATIONAL JOURNAL OF MULTIPHASE FLOW 36.2(2010):109-118.
Files in This Item:
File Name/Size DocType Version Access License
20131127-1329-复件 1-s(1373KB) 限制开放CC BY-NC-SAApplication Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wang, Wei]'s Articles
[Lu, Bona]'s Articles
[Zhang, Nan]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wang, Wei]'s Articles
[Lu, Bona]'s Articles
[Zhang, Nan]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wang, Wei]'s Articles
[Lu, Bona]'s Articles
[Zhang, Nan]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.