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Center-Line Velocity Change Regime in a Parallel-Flow Square Exhaust Hood

Author

Listed:
  • Jianwu Chen

    (School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Institute of Occupational Health, China Academy of Safety Science and Technology, Beijing 100029, China)

  • Longzhe Jin

    (School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Zhenfang Chen

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

  • Bin Yang

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

  • Yanqiu Sun

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

  • Shulin Zhou

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

Abstract

A parallel-flow exhaust hood is an effective ventilation device to control dust and toxic pollutants and protect the occupational health of workers, whether it is used alone or combined with a uniform air supply hood in a push–pull ventilation system. Some scholars have studied the outside air flow characteristics of the conventional exhaust hood with non-uniform air speed at the hood face, but the law of velocity variation outside the parallel-flow exhaust hood is not clear at present. Therefore, this paper uses the dimensionless method to study the center-line velocity change regime in a parallel-flow square exhaust hood based on simulation and experimental data. The results show that the dimensionless center-line velocity has a good change law with the characteristic length of exhaust hood in a parallel-flow square exhaust hood, which can eliminate the influence of hood face velocity and the hood size on the velocity change regime; and the experimental data is basically consistent with the calculated data, which shows that the regression equation method is reliable.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:12:p:4485-:d:374872
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    References listed on IDEAS

    as
    1. Pinelli, Michele & Suman, Alessio, 2014. "A numerical method for the efficient design of free opening hoods in industrial and domestic applications," Energy, Elsevier, vol. 74(C), pages 484-493.
    2. 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.
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    Citations

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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, 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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