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

Jianwu Chen, Longzhe Jin, Zhenfang Chen, Bin Yang, Yanqiu Sun and Shulin Zhou
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Jianwu Chen: School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, 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

IJERPH, 2020, vol. 17, issue 12, 1-11

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.

Keywords: center-line velocity; poison control; parallel-flow; exhaust hood (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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