Numerical Study of Blowing-Suction Ventilation Systems Performance

In most industrial processes, toxic pollutants and vapors are produced and released, which cause various diseases in people working in industry and irreparable damage to the environment. Industrial ventilation systems are considered as one of the most effective methods of reducing and controlling gaseous pollutants and dust particles. One of the effective systems in industrial ventilation is blowing -suction ventilation systems. In this study, the effect of flow ratio (ratio of blowing flow to suction flow) and direction of blowing jet air on the performance of blowing-suction ventilation system was investigated numerically. The mixing parameter has been used as an indicator to measure the performance of the ventilation system. The results showed that the performance of the ventilation system blowing-sucking by reducing the current ratio improved exponentially. It was also found that one of the ways to improve the performance of the blowing – suction ventilation system is to reduce the direction of the blowing angle.

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Numerical Study of the Respirable Coal Dust Removal Performance of a Vortex Ventilation System at an Excavation Face

Energies ◽

10.3390/en11092449 ◽

2018 ◽

Vol 11 (9) ◽

pp. 2449 ◽

Cited By ~ 5

Author(s):

Xiaofei Liu ◽

Ping Chang ◽

Enyuan Wang ◽

Zhenguo Zhang ◽

Shuai Yang

Keyword(s):

Numerical Study ◽

Coal Dust ◽

Ventilation System ◽

Dust Control ◽

Dust Removal ◽

Two Phase ◽

Fluid Behavior ◽

Comparison Results ◽

High Concentrations ◽

Ventilation Systems

Coal dust is one of the most serious issues in coal mines. The miners at an excavation face have a high potential for exposure to high concentrations of coal dust. The main method for removing coal dust is by ventilation. To better control the coal dust at the excavation face, it is important to understand the coal dust movement patterns and distribution characteristics. This paper used the computational fluid dynamics (CFD) approach to simulate coal dust movement under two different ventilation systems. The Eulerian-Lagrange method was used to study the gas‒solid two-phase fluid behavior. The coal dust concentration distributions under the two ventilation systems are presented and further compared. From the comparison results, it is found that a vortex ventilation system has better coal dust removal performance. This ventilation system is recommended for excavation for better coal dust control and miners’ health protection.

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Determination of optimal blowing-to-suction flow ratio in mechanized excavation face with wall-mounted swirling ventilation using numerical simulations

International Journal of Coal Science & Technology ◽

10.1007/s40789-020-00384-3 ◽

2021 ◽

Author(s):

Runze Gao ◽

Pengfei Wang ◽

Yongjun Li ◽

Ronghua Liu

Keyword(s):

Ventilation System ◽

Simulation Models ◽

Distribution Patterns ◽

Flow Ratio ◽

Discrete Phase Model ◽

Dust Suppression ◽

Air Curtain ◽

Suppression Effect ◽

Airflow Field ◽

Suction Flow

AbstractWall-mounted swirling ventilation is a new type of system in mechanized excavation faces with a dust suppression performance that is closely related to the blowing-to-suction flow ratio. Physical and simulation models were developed according to the No. C103 mechanized excavation face in the Nahe Coal Mine of the Baise Mining Bureau, Guangxi Province to optimize the blowing-to-suction flow ratio for wall-mounted swirling ventilation. Both the k-ε turbulence model and the discrete phase model were utilized to simulate airflow field structures and dust concentration distribution patterns at various blowing-to-suction flow ratios. The results suggest that higher blowing-to-suction flow ratios increase the airflow field disturbance around the working face and weaken the intensity of the axial air curtain. On the other hand, both the intensity of the radial air curtain and the dust suppression effect are enhanced. At a blowing-to-suction flow ratio of 0.8, the wall-mounted swirling ventilation system achieved the most favorable dust suppression performance. Both the total dust and respirable dust had their lowest concentrations with maximum efficiencies of reducing both types at 90.33% and 87.16%, respectively.

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Experimentation of a banded tandem ventilation system with balanced structure

MATEC Web of Conferences ◽

10.1051/matecconf/202030500033 ◽

2020 ◽

Vol 305 ◽

pp. 00033

Author(s):

Doru Cioclea ◽

Ion Gherghe ◽

Emeric Chiuzan ◽

Adrian Matei ◽

Răzvan Drăgoescu

Keyword(s):

Thermal Comfort ◽

Ventilation System ◽

Work Conditions ◽

Complete Analysis ◽

Industrial Areas ◽

System A ◽

Polluted Atmosphere ◽

Industrial Ventilation ◽

Balanced Structure ◽

Ventilation Systems

The problem of industrial ventilation has arisen as a result of the serious pollution problems of both the industrial areas and the industrial premises. The polluted atmosphere, outside the industrial premises, can penetrate inside them naturally or through ventilation systems. The commissioning of a ventilation system occurs whenever a workplace generates more pollutants than those normally accepted by hygiene of work conditions, safety, health, etc. In order to be able to choose the correct ventilation system, a complete analysis of the workplace to be ventilated must be carried out so that the solution chosen to solve the problem of the exhaust, but also be well received by the user, respecting the thermal comfort of it. The paper presents the results of experimenting with a balanced tandem ventilation system with stable and unstable operation.

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Implementation of an algorithm for determining the effectiveness of ventilation and energy efficiency in industrial ventilation systems

E3S Web of Conferences ◽

10.1051/e3sconf/201911106038 ◽

2019 ◽

Vol 111 ◽

pp. 06038

Author(s):

Marius Adam ◽

Olga Bancea ◽

Ioan Aschilean

Keyword(s):

Energy Efficiency ◽

Air Quality ◽

Ventilation System ◽

Source Control ◽

Indoor Climate ◽

Night Time ◽

Industrial Ventilation ◽

Ventilation Efficiency ◽

Ventilation Rates ◽

Ventilation Systems

The requirements for good indoor air quality and energy efficiency have often been considered to conflict with each other, however, buildings with low energy consumption in Europe seem to have also a lower rate of building related health symptoms. The paper aims to develop a succession of necessary operations, an algorithm, for the determination of ventilation efficiency and energy efficiency in industrial ventilation systems, starting from a general model that will be developed according to the particularities of the industrial ventilation system. These systems are important as they are related both to energy cost and indoor climate management as well as to the health of the occupants. The stages of algorithm development will include: source control and efficient removal of contaminants, proper location of fresh air intakes, cleaning of intake air, efficient air distribution in rooms with improved ventilation efficiency, heat recovery from exhaust air, night time ventilation cooling, ventilation rates control by air quality, correct balancing of air flows and controlling the indoor climate locally.

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Presentation of Branch Entry Losses in Industrial Ventilation Systems

Applied Occupational and Environmental Hygiene ◽

10.1080/1047322x.1991.10387897 ◽

1991 ◽

Vol 6 (5) ◽

pp. 364-370

Author(s):

George Wahl ◽

Howard E. Ayer ◽

Klaus Willeke

Keyword(s):

Industrial Ventilation ◽

Ventilation Systems

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Investigation of thermal comfort on Innovative Personalized Ventilation Systems for Aircraft Cabins: A numerical Study with Computational Fluid Dynamics

Thermal Science and Engineering Progress ◽

10.1016/j.tsep.2021.101081 ◽

2021 ◽

pp. 101081

Author(s):

Chanfiou Ahmed Mboreha ◽

Sun Jianhong ◽

Wang Yan ◽

Sun Zhi ◽

Zhang Yantai

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Thermal Comfort ◽

Numerical Study ◽

Aircraft Cabins ◽

Personalized Ventilation ◽

Ventilation Systems

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Evaluation of litter material and ventilation systems in poultry production: III. litter reuse, darkling beetle populations and intestinal parasites

Revista Brasileira de Zootecnia ◽

10.1590/s1516-35982011000600028 ◽

2011 ◽

Vol 40 (6) ◽

pp. 1372-1380

Author(s):

Valéria Maria Nascimento Abreu ◽

Doralice Pedroso de Paiva ◽

Paulo Giovanni de Abreu ◽

Arlei Coldebella

Keyword(s):

Broiler Chickens ◽

Intestinal Parasites ◽

Organic Fertilizer ◽

Ventilation System ◽

Poultry Production ◽

Rice Husks ◽

Darkling Beetle ◽

Eimeria Spp ◽

Soybean Straw ◽

Ventilation Systems

It was evaluated the quality of rice husks or soybean straw as litter substrate and the effect of litter reuse for four consecutive flocks of broiler chickens on populations of darkling beetle and intestinal parasite and as organic fertilizer. The experiment was carried out in four 12 m × 10 m poultry houses, internally divided in 4 boxes/poultry house with 200 birds/pen for four consecutive flocks, each flock with a duration of 42 days and with a 15-day downtime between flocks. The evaluated treatments were two ventilation systems (stationary or oscillating fans) and two litter materials (soybean straw or rice husks). Darkling beetle population was followed by collecting the insects in traps, three traps per box, and endoparasite litter contamination was determined by eggs/oocyst counts per gram of litter. Levels of dry matter, total nitrogen, total phosphorus, potassium, copper, zinc, manganese, iron, organic carbon and pH were evaluated by physical/chemical analyses of samples of the litters in each flock. Overall, litters of broilers used by three flocks meet the minimal legal requirements to be marketed as simple organic fertilizer, regardless to the material used as substrate. Soybean straw presented higher darkling beetle counts in stationary ventilation system as well as in oscillating ventilation system. The probability of rice husks litter present contamination by Eimeria spp oocysts is 18.78 times higher in rice husks than in soybean straw litter when both are submitted to oscillating ventilation, and 1.32 higher when stationary ventilation is used. Litter temperature does not influence significantly levels of contamination by oocysts.

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Air Flow Straighteners’ Application to Reduce the Power Consumption of Exhaust Ventilation Schemes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.875.137 ◽

2018 ◽

Vol 875 ◽

pp. 137-140 ◽

Cited By ~ 5

Author(s):

Valery N. Azarov ◽

Natalia M. Sergina ◽

I.V. Stefanenko

Keyword(s):

Power Consumption ◽

Air Flow ◽

Ventilation System ◽

Aerodynamic Resistance ◽

Experimental Studies ◽

Swirling Flows ◽

Dust Collector ◽

Exhaust Ventilation ◽

Outlet Pipe ◽

Ventilation Systems

It was proposed to use air flow screw straightened units in outlet pipe of the dust collectors to reduce the aerodynamic resistance of exhaust ventilation systems. It is allowed to decrease power consumption for their maintenance operation consequently. The article describes the results of experimental studies to evaluate its effectiveness by applying the tangential screw straightened unit within ventilation system. The obtained results showed that the use of this device allows reducing the aerodynamic resistance of the cyclone by 14.6%, and for counter-swirling flows’ dust collector (CSFC) by 17.2-23.6%. It was found that meanings of the aerodynamic resistance depend on value the share proportion of the flow entering into lower CSFC apparatus’ input.

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Numerical Solution for Boundary Layer Flow of a Dusty Micropolar Fluid Due to a Stretching Sheet with Constant Wall Temperature

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences ◽

10.37934/arfmts.87.1.3040 ◽

2021 ◽

Vol 87 (1) ◽

pp. 30-40

Author(s):

Anisah Dasman ◽

Abdul Rahman Mohd Kasim ◽

Iskandar Waini ◽

Najiyah Safwa Khashi’ie

Keyword(s):

Differential Equations ◽

Ordinary Differential Equations ◽

Wall Temperature ◽

Micropolar Fluid ◽

Stretching Sheet ◽

Numerical Solutions ◽

Numerical Study ◽

Particle Interaction ◽

Dust Particles ◽

Constant Wall Temperature

This paper aims to present the numerical study of a dusty micropolar fluid due to a stretching sheet with constant wall temperature. Using the suitable similarity transformation, the governing partial differential equations for two-phase flows of the fluid and the dust particles are reduced to the form of ordinary differential equations. The ordinary differential equations are then numerically analysed using the bvp4c function in the Matlab software. The validity of present numerical results was checked by comparing them with the previous study. The results graphically show the numerical solutions of velocity, temperature and microrotation distributions for several values of the material parameter K, fluid-particle interaction parameter and Prandtl number for both fluid and dust phase. The effect of microrotation is investigated and analysed as well. It is found that the distributions are significantly influenced by the investigated parameters for both phases.

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