Experimental Investigation of Baffle Effect on the Flow in a Rectangular Primary Sedimentation Tank

被引:0
作者
Jamshidnia, H. [1 ]
Firoozabadi, B. [1 ]
机构
[1] Sharif Univ Technol, Sch Mech Engn, Ctr Excellence Energy Convers, Tehran, Iran
来源
SCIENTIA IRANICA TRANSACTION B-MECHANICAL ENGINEERING | 2010年 / 17卷 / 04期
关键词
ADV; Intermediate baffle; Sedimentation tank; Primary settling tank; Reverse flow region; ACOUSTIC DOPPLER-VELOCIMETER; DESIGN; PERFORMANCE;
D O I
暂无
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
In primary sedimentation tanks, short-circuiting enlargement of dead zones and high flow mixing problems are caused by circulation regions (dead zones), which can reduce the optimal sedimentation of particles. For proper design of such tanks, the formation of recirculation zones should be avoided. The provision of a baffle as a geometrical modification of a lank may influence the flow field for better sedimentation. Thus, in this study, velocity measurements were performed by a three-dimensional Acoustic Doppler Velocimeter (A DV) to investigate baffle effects on the velocity distribution in a primary rectangular sedimentation tank, quantitatively. Effects of baffle positioning were also determined. Mean flow analysis shows how a baffle can alter the hydrodynamics of the flow field. R was quantitatively found that the intermediate baffle not only influences the flow field in its downstream, but also affects the flow pattern in its upstream. It was found that the baffle setting and its position relative to the inlet and outlet influences the flow field and the development of flow. Baffled flow may provide better conditions for sedimentation by influencing velocity profiles. However, further detailed experimental study is necessary to fully capture the baffle effect and obtain further insight into the complex flow field in a sedimentation tank.
引用
收藏
页码:241 / 252
页数:12
相关论文
共 23 条
[1]  
Ahmed FH, 1996, WATER AIR SOIL POLL, V92, P251
[2]  
*AM WAT WORK ASS, 1990, WAT TREATM PLANT DES
[3]  
ANDERSON NE, 1945, SEWAGE WORKS J, V17, P50
[4]  
[Anonymous], 2006, SCI IRAN
[5]   IMPROVEMENT OF FLOW IN FINAL SETTLING TANKS [J].
BRETSCHER, U ;
KREBS, P ;
HAGER, WH .
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 1992, 118 (03) :307-321
[6]  
CAMP TR, 1946, T AM SOC CIV ENG, V111, P895
[7]   Improving fluid flow in clarifiers using a highly porous media [J].
Campbell, Brian K. ;
Empie, H. Jeff .
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 2006, 132 (10) :1249-1254
[8]  
CRIPPS SJ, 2000, J AQUACULTURAL ENG, P33
[9]  
DECLERCQ B, 2003, BIOMATH, V653
[10]   Evaluating the spatial resolution of an acoustic Doppler velocimeter and the consequences for measuring near-bed flows [J].
Finelli, CM ;
Hart, DD ;
Fonseca, DM .
LIMNOLOGY AND OCEANOGRAPHY, 1999, 44 (07) :1793-1801