Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (5): 122-130.doi: 10.6040/j.issn.1672-3961.0.2021.177

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Analysis of the influence of the underside baffle and deflector of the fume hood on the flow field

Ruiyi YAN1,2(),Zhen DONG2,Sen LU2,Yanhua LAI1,2,*(),Mingxin LÜ1,2   

  1. 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Suzhou Institute, Shandong University, Suzhou 215123, Jiangsu, China
  • Received:2021-04-19 Online:2021-10-20 Published:2021-09-29
  • Contact: Yanhua LAI E-mail:yanruiyi@mail.sdu.edu.cn;laiyh@sdu.edu.cn

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Abstract:

For the phenomenon of vortex and gas escape in the flow field of the extant fume hood, the computational fluid dynamics method was used for simulation. This research changed the shape parameters of the underside structure of the fume hood window, used circular arc baffles with different radii, elliptical arc baffles with different lengths, and added deflectors with different radii. Then this research studied the influence of structural changes on the flow field in the fume hood by analyzing the size and location of the vortex to obtain the direction of structural optimization. The results showed that when the height of the underside baffle was low and the length was short, there was obvious large vortex in the center position of the fume hood and near the wall. A baffle with a height greater than 50 mm and a length greater than 90 mm could significantly reduce the vortex at the center of the fume hood and at the junction of the baffle and the side wall. Adding a deflector could optimize the flow field and make the center vortex disappear, and the radius of the deflector should not be greater than 70 mm, otherwise obvious vortices would be excited on the outside and end of the baffle, which provides a basis for the rational design of fume hoods.

Key words: fume hood, flow field, vortex, baffle, structure optimization

CLC Number: 

  • TU834.4

Fig.1

The basic structure of the fume hood"

Fig.2

Geometric model of fume hood"

Fig.3

Schematic diagram of meshing"

Table 1

The shape change of baffle and deflector mm"

类型 圆弧挡板半径变化 椭圆弧挡板长度变化 导流板半径变化
1 20 30 50
2 30 60 70
3 40 90 90
4 50 120 110
5 60 150 130

Fig.4

Schematic diagram of the analyzed planes"

Fig.5

Schematic diagram of the vortex formed by the fume hood"

Fig.6

Vortex near the arc baffle"

Fig.7

Comparison of vortex heights of baffles designed with circular arc"

Fig.8

Vortex near the elliptical arc baffle"

Fig.9

Comparison of vortex heights of baffles designed with elliptical arc"

Fig.10

Vortex near the deflector"

Fig.11

Comparison of vortex heights of deflectors with different radii"

1 陈静. 实验室排风柜的安全特性及节能效果研究[D]. 上海: 同济大学, 2007.
CHEN Jing. Studies about occupation safety and energy saving effects for laboratory fume hood[D]. Shanghai: Tongji University, 2007.
2 ROBERTSON P , BAILEY P V . Suggested improvements to prevent the escape of fume from beneath the sash of a fume cupboard[J]. The Annals of Occupational Hygiene, 1980, 23 (3): 305- 309.
3 ÖZDEMIR İB , WHITELAW J H , BIÇEN A F . Flow structures and their relevance to passive scalar transport in fume cupboards[J]. Journal of Mechanical Engineering Science, 1993, 207 (2): 103- 115.
doi: 10.1243/PIME_PROC_1993_207_106_02
4 DURST F , PEREIRA J C F . Experimental and numerical investigations of the performance of fume cupboards[J]. Building and Environment, 1991, 26 (2): 153- 164.
doi: 10.1016/0360-1323(91)90022-4
5 DURST F , PEREIRA J C F . Numerical simulation and optimization of the aerodynamics flow field inside fume cupboards[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1992, 40 (2): 127- 145.
doi: 10.1016/0167-6105(92)90362-E
6 THOMAS C S , MICHAEL R F , JOHN M D . A design and performance analysis of laboratory fume hoods[J]. Applied Occupational and Environmental Hygiene, 2011, 9 (2): 117- 124.
7 TSENG L C , HUANG R F , CHEN C C , et al. Correlation between airflow patterns and performance of a laboratory fume hood[J]. Journal of Occupational and Environmental Hygiene, 2006, 3 (12): 694- 706.
doi: 10.1080/15459620601015695
8 HUANG R F , WU Y D , CHEN H D , et al. Development and evaluation of an air-curtain fume cabinet with considerations of its aerodynamics[J]. The Annals of Occupational Hygiene, 2007, 51 (2): 189- 206.
9 CHERN M J , CHENG W Y . Numerical investigation of turbulent diffusion in push-pull and exhaust fume cupboards[J]. The Annals of Occupational Hygiene, 2007, 51 (6): 517- 531.
10 程勇, 刘东, 李强民. 障碍物对排风柜性能影响的实验研究[J]. 制冷与空调, 2011, 25 (4): 339- 345.
doi: 10.3969/j.issn.1671-6612.2011.04.006
CHENG Yong , LIU Dong , LI Qiangmin . Experiment research of effect of obstacles on performance of fume hood[J]. Refrigeration and Air Conditioning, 2011, 25 (4): 339- 345.
doi: 10.3969/j.issn.1671-6612.2011.04.006
11 HUANG R F , CHEN J K , HSU C M , et al. Effects of boundary-layer separation controllers on a desktop fume hood[J]. Journal of Occupational and Environmental Hygiene, 2016, 13 (10): 802- 815.
doi: 10.1080/15459624.2016.1179387
12 HUANG R F , HSU C M , LIN K L . Influence of high heat load on flow and containment of an inclined air-curtain (IAC) fume hood[J]. Journal of Occupational and Environmental Hygiene, 2018, 15 (4): 322- 333.
doi: 10.1080/15459624.2018.1428330
13 MATTOX T M , FALZONE C , SADRIZADEH S , et al. Impact of source position and obstructions on fume hood releases[J]. Annals of Work Exposures and Health, 2019, 63 (8): 937- 949.
doi: 10.1093/annweh/wxz062
14 刘琦, 满瑞林, 唐曾琦, 等. 通风柜的气流数值模拟与计算[J]. 计算机与应用化学, 2015, 32 (12): 1487- 1490.
LIU Qi , MAN Ruilin , TANG Zengqi , et al. Numerical simulation and calculation of fume hood airflow performance[J]. Computers and Applied Chemistry, 2015, 32 (12): 1487- 1490.
15 PIETROWICZ S , KOLASIŃSKI P , POMORSKI M . Experimental and numerical flow analysis and design optimization of a fume hood using the CFD method[J]. Chemical Engineering Research and Design, 2018, 132, 627- 643.
doi: 10.1016/j.cherd.2018.02.011
16 CHEN K , WANG W , ZHANG W J . Investigation of influential factors on laboratory fume hood containment performance[J]. Science and Technology for the Built Environment, 2020, 26 (3): 387- 399.
doi: 10.1080/23744731.2019.1637192
17 LIU X D , LAX P D . Positive schemes for solving multi-dimensional hyperbolic systems of conservation laws[J]. Journal of Computational Physics, 1995, 187 (2): 428- 440.
18 TSENG L C , HUANG R F , CHEN C C . Effects of doorsill jet injection on fume cupboard containment[J]. The Annals of Occupational Hygiene, 2008, 52 (7): 635- 644.
19 MENTER F R . Two-equation eddy-viscosity turbulence models for engineering applications[J]. AIAA Journal, 1994, 32 (8): 1598- 1605.
doi: 10.2514/3.12149
20 BŁASIAK P , KOLASIŃSKI P . Modelling of the mixed convection in a lid-driven cavity with a constant heat flux boundary condition[J]. Heat and Mass Transfer, 2016, 52 (3): 595- 609.
doi: 10.1007/s00231-015-1583-6
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