中国科学院大连化学物理研究所机构知识库
Advanced  
DICP OpenIR  > 中国科学院大连化学物理研究所  > 期刊论文
题名: Experimental and numerical study of particle velocity distribution in the vertical pipe after a 90 degrees elbow
作者: Lu, Yong1;  Tong, Zhenbo1;  Glass, Donald H.2;  Easson, William J.2;  Ye, Mao3
关键词: Pneumatic conveying ;  Roping ;  Particle velocity ;  Laser Doppler Anemometry
刊名: POWDER TECHNOLOGY
发表日期: 2017-06-01
DOI: 10.1016/j.powtec.2016.11.050
卷: 314, 页:500-509
收录类别: SCI ;  ISTP
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: A major problem of utilizing co-firing technique is controllably distributing fuel mixtures of pulverized coal and granular biomass in a common pipeline. This research related into particle velocity distribution in the vertical pipe after a right angle elbow was undertaken using the Laser Doppler Anemometry (LDA) technique and a coupled computational fluid dynamics (CFD)-discrete element method (DEM) simulation. According to the similarity criterion of Stokes Number, three types of glass beads were used to model the dilute gas-solid flow of pulverized coal or biomass pellets. In the vertical pipe after an elbow (R/D 13, R is the bend radius as 100 mm and D is pipe diameter as 75 mm), a horseshoe shape feature has been found on cross-sectional distributions of the axial particle velocity for all three types of glass beads on the first section which is 15 mm away from the blend exit. At the further downstream sections, the horseshoe-shaped feature is gradually distorted until it completely disappears. The distance for total disintegration is about 300 mm away from the first section for the first type of glass beads, 150 mm away for the second type and 75 mm away for the third one. As for particle number rate, its cross-sectional distribution on the first section shows that a rope is formed at the pipe outer wall where the maximum particle number rate occurs. On the whole, the rope formed by the first type of glass beads can be still observed at the section which is 450 mm away from the first section. For the second type of glass beads, the rope will disintegrate from the section (300 mm away) according to the cross-sectional distributions of the dimensional value of particle axial velocity divided by air conveying velocity. Overall, the roping characteristic is not obviously shown in the gas-solid flow of the third type of glass beads after the first section. All of these indicate that ropes formed from larger particles disperse more easily, for reasons perhaps related to their higher inertia. In addition, CFD-DEM analysis was employed to determine the particle characteristics to confirm this assumption. The numerical results indicated that the flow pattern has the highest axial velocity near the elbow to form the 'horseshoe' pattern. As the particles with lower Stokes Number were easier to follow the air flow, this is the reason why the horseshoe pattern of smaller particles was more obvious than larger particles. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000401880700046
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152312
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

Files in This Item:

There are no files associated with this item.


作者单位: 1.Southeast Univ, Key Lab Energy Thermal Convers & Control, Minist Educ, Sch Energy & EnvironmenL, Nanjing 210096, Jiangsu, Peoples R China
2.Univ Edinburgh, Sch Engn & Elect, Inst Mat & Proc, Edinburgh EH9 3FB, Midlothian, Scotland
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Lu, Yong,Tong, Zhenbo,Glass, Donald H.,et al. Experimental and numerical study of particle velocity distribution in the vertical pipe after a 90 degrees elbow[J]. POWDER TECHNOLOGY,2017,314:500-509.
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Lu, Yong]'s Articles
 [Tong, Zhenbo]'s Articles
 [Glass, Donald H.]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Lu, Yong]‘s Articles
 [Tong, Zhenbo]‘s Articles
 [Glass, Donald H.]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to Del.icio.us  Add to Digg  Add to Reddit 
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

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

 

 

Valid XHTML 1.0!
Powered by CSpace