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RSS FeedsIJERPH, Vol. 15, Pages 2884: Study on Flow Field Characteristics of the 90 Rectangular Elbow in the Exhaust Hood of a Uniform Push-Pull Ventilation Device (International Journal of Environmental Research and Public Health)

 
 

16 december 2018 13:00:08

 
IJERPH, Vol. 15, Pages 2884: Study on Flow Field Characteristics of the 90 Rectangular Elbow in the Exhaust Hood of a Uniform Push-Pull Ventilation Device (International Journal of Environmental Research and Public Health)
 




A uniform push–pull ventilation device can effectively improve indoor air quality (IAQ). The 90° rectangular elbow is an important part of the push–pull ventilation device. This paper analyzes the flow field characteristics of the 90° rectangular elbows under different working conditions. This was done by using computational fluid dynamics (CFD) simulation (Fluent). The flow lines, velocity and pressure distribution patterns of the elbow flow field are revealed in detail. The wind velocity non-uniformity and wind pressure non-uniformity of the 90° rectangular elbows with different coefficients of radius curvature R and rectangular section height h are also compared. The results show that when R ≥ 2.5 h, the wind flow traces inside the elbow are basically parallel lines. At the same time, the average wind velocity and the average wind pressure are stable. Also, the wind velocity non-uniformity and wind pressure non-uniformity decrease with the increase of R. Therefore, considering the space and material loss caused by an increase in radius of curvature, the elbow with R = 2.5 h can be used as the best design structure for the 90° rectangular elbow, which is of great significance for improving the control effect of dust and toxic pollutants in a uniform push–pull ventilation device.


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19 viewsCategory: Medicine, Pathology, Toxicology
 
IJERPH, Vol. 15, Pages 2885: Estimated Residential Exposure to Agricultural Chemicals and Premature Mortality by Parkinson`s Disease in Washington State (International Journal of Environmental Research and Public Health)
IJERPH, Vol. 15, Pages 2883: The Development Path of the Lighting Industry in Mainland China: Execution of Energy Conservation and Management on Mercury Emission (International Journal of Environmental Research and Public Health)
 
 
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