Effect of velocity non-uniformity of supply air on the mixing characteristics of push-pull ventilation systems

Wang, Yi; Quan, Mengfan; Zhou, Yu

doi:10.1016/j.energy.2019.115962

Cited by 28 publications

(10 citation statements)

References 30 publications

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“…Before reviewing the results of the analysis, it is necessary to ensure the accuracy of the simulation performed. One way to validate the results of numerical solution is to check the airflow velocity between the jet and the hood and compare it with the results of Wang et al [5]…”

Section: Mesh Independencymentioning

confidence: 99%

“…Numerous studies have been performed on blowing-suction ventilation systems numerically and in the past. In a study, Wang et al [5] investigated the mixing characteristics of different blowing airflow profiles and changes in the direction of blowing flow in a twodimensional and laboratory numerical study. Using equation of species transfer and equations of energy, momentum, continuity and mass survival, they simulated the mixing of ambient air with the exhaust air of the jet and obtained the amount of mixing of ambient air with the jet air under the above conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study of Blowing-Suction Ventilation Systems Performance

Ahvazi

Khabazi

Khayyaminejad

2021

MJMIE

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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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Section: Mesh Independencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Blowing-Suction Ventilation Systems Performance

Ahvazi

Khabazi

Khayyaminejad

2021

MJMIE

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“…Compared with local exhaust ventilation, push-pull ventilation has better contaminants control due to increased air supply [ 3 , 4 ]. Parallel push-pull ventilation uses the low turbulence intensity, uniform and wide air flow with directionality to push the contaminants into the exhaust outlet [ 5 , 6 ], which has been widely used in workplace contaminants control such as painting [ 7 , 8 ], printing [ 9 ] and cleaning using organic solvent [ 10 , 11 ], welding [ 12 ] and pathology laboratories [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Changing Patterns of the Flow Ratio with the Distance of Exhaust and Supply Hood in a Parallel Square Push-Pull Ventilation

Chen

2022

IJERPH

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The method of flow ratio k is often used for designing parallel push-pull ventilation. The k value is mostly selected empirically and is difficult to determine accurately, resulting in an imprecise design of the push-pull ventilation system. Therefore, parallel push-pull ventilation was taken as the research object in this paper. The push-pull ventilation studied consists of a square uniform supply hood and a square uniform exhaust hood, and the side length of pull hood and pull hood was same. A workbench was set between the push hood and pull hood, and the source of toluene pollutions was set in the center of the worktable surface. The optimal k values for different distances between push hood and pull hood were studied by numerical simulation using Ansys Fluent, which were obtained base on the distribution of wind speed and toluene concentration. The results showed that parallel push-pull ventilation is not suitable for applications when L/a ≥ 6. The changing patterns of k value with L/a is proposed in the range of 1.5 ≤ L/a ≤ 5 for the parallel square push-pull ventilation, which can be used to estimate k value relatively accurately under the condition that L/a is known, so as to guide the determination of the exhaust air volume of the parallel push-pull ventilation system.

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“…Air-mixing is another standard method to mix fluid, gas, or powder through the blower and pump, 22 , 23 which has been widely used in the fuel-/air-mixing apparatus, 24 , 25 ventilation systems, 26 and aerodynamic simulation. 27 Many scholars 28 , 29 have studied the mixing characteristics of jets under different exit shapes. For the polymer flooding in EOR, after the premixing by Venturi jetting or the air-mixing, the water–polymer powder mixture is transferred to the stirring tank for further mixing and curing.…”

Section: Introductionmentioning

confidence: 99%

“…The Venturi jetting is becoming the standard for a proportional to complete a mixture of two liquids in the process industry. , Numerical and experimental studies on mixing behavior of Venturi jet, such as geometry optimization, device design, , and mixing hydrodynamics, have received considerable attention in recent years. Air-mixing is another standard method to mix fluid, gas, or powder through the blower and pump, , which has been widely used in the fuel-/air-mixing apparatus, , ventilation systems, and aerodynamic simulation . Many scholars , have studied the mixing characteristics of jets under different exit shapes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Polymer Dispersion Systems for Polymer Injection on Offshore Platforms

Wang

et al. 2020

ACS Omega

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Because of the limited space and high cost of offshore platforms, the dispersion and dissolution of the polymer are required to be of high efficiency, which is essential for polymer injection to enhance hydrocarbon recovery. The numerical simulation models of the water–powder mixing process by Venturi jetting and air-mixing were established. The multiphase flow fields in the water jet ejector, water–powder mixing head, and stirring tank were numerically simulated by FLUENT. Then, the distributions of velocity, volume fraction, pressure, and turbulent kinetic energy of each phase were obtained to evaluate the effects of polymer dispersion and the dissolution of the two mixing methods. According to the maximum velocity of the mixture at the Venturi jet, the optimized length of the throat is 25 mm in our models. The results of the air-mixing process show that a 120° angle of support rods has the best effect of water–powder mixing. The results of the present study show that compared with air-mixing, the combination of Venturi jet and the stirring tank can obtain a broader agitation range and more extensive effect on the flow field, which could uniformly disperse the polymer powder into water. This study has a guiding significance for the design of the onsite polymer injection process.

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Effect of velocity non-uniformity of supply air on the mixing characteristics of push-pull ventilation systems

Cited by 28 publications

References 30 publications

Numerical Study of Blowing-Suction Ventilation Systems Performance

Numerical Study of Blowing-Suction Ventilation Systems Performance

Changing Patterns of the Flow Ratio with the Distance of Exhaust and Supply Hood in a Parallel Square Push-Pull Ventilation

Numerical Simulation of Polymer Dispersion Systems for Polymer Injection on Offshore Platforms

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