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Study on Flow Field Characteristics of the 90° Rectangular Elbow in the Exhaust Hood of a Uniform Push–Pull Ventilation Device

1
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
2
Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China
3
China Academy of Safety Science and Technology, Beijing 100029, China
4
School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2018, 15(12), 2884; https://doi.org/10.3390/ijerph15122884
Received: 17 November 2018 / Revised: 4 December 2018 / Accepted: 12 December 2018 / Published: 16 December 2018
(This article belongs to the Section Environmental Science and Engineering)
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. View Full-Text
Keywords: uniform push–pull ventilation device; 90° rectangular elbow; radius of curvature; non-uniformity; flow field characteristics uniform push–pull ventilation device; 90° rectangular elbow; radius of curvature; non-uniformity; flow field characteristics
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Wu, X.; Liu, L.; Luo, X.; Chen, J.; Dai, J. Study on Flow Field Characteristics of the 90° Rectangular Elbow in the Exhaust Hood of a Uniform Push–Pull Ventilation Device. Int. J. Environ. Res. Public Health 2018, 15, 2884.

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