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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

Author

Listed:
  • Xiang Wu

    (School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China)

  • Lindong Liu

    (School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China)

  • Xiaowei Luo

    (Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China)

  • Jianwu Chen

    (China Academy of Safety Science and Technology, Beijing 100029, China)

  • Jingwen Dai

    (School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China)

Abstract

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.

Suggested Citation

  • Xiang Wu & Lindong Liu & Xiaowei Luo & Jianwu Chen & Jingwen Dai, 2018. "Study on Flow Field Characteristics of the 90° Rectangular Elbow in the Exhaust Hood of a Uniform Push–Pull Ventilation Device," IJERPH, MDPI, vol. 15(12), pages 1-12, December.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:12:p:2884-:d:190940
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    References listed on IDEAS

    as
    1. Alessandra Cincinelli & Tania Martellini, 2017. "Indoor Air Quality and Health," IJERPH, MDPI, vol. 14(11), pages 1-5, October.
    2. Pier Mannuccio Mannucci & Massimo Franchini, 2017. "Health Effects of Ambient Air Pollution in Developing Countries," IJERPH, MDPI, vol. 14(9), pages 1-8, September.
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    Cited by:

    1. Lindong Liu & Cuifeng Du & Yuan Wang & Jianwu Chen & Bin Yang & Weibo Jin, 2023. "Simulation Experiment Research of Mine Roadway Simulating Test Device with Adjustable Wind Velocity and Temperature and Humidity," IJERPH, MDPI, vol. 20(5), pages 1-11, February.
    2. Jianwu Chen & Longzhe Jin & Zhenfang Chen & Bin Yang & Yanqiu Sun & Shulin Zhou, 2020. "Center-Line Velocity Change Regime in a Parallel-Flow Square Exhaust Hood," IJERPH, MDPI, vol. 17(12), pages 1-11, June.
    3. Jianwu Chen, 2022. "Changing Patterns of the Flow Ratio with the Distance of Exhaust and Supply Hood in a Parallel Square Push-Pull Ventilation," IJERPH, MDPI, vol. 19(5), pages 1-10, March.

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