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Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure
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Haoyang Lu1, Congcong Wang1, Hongbing Chen1, Yan Zhang1, Chunyang Li1, Yuhang Liu1, Liguo Zhao2
Journal of Refrigeration | 2025, 46(1) : 140 - 149
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Journal of Refrigeration | 2025, 46(1): 140-149
Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure
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Haoyang Lu1, Congcong Wang1, Hongbing Chen1, Yan Zhang1, Chunyang Li1, Yuhang Liu1, Liguo Zhao2
Affiliations
  • 1.School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 102616, China
  • 2.Beijing High Strength Concrete Co., Ltd., Beijing, 100071, China
Published: 2025-02-16 doi: 10.12465/j.issn.0253-4339.2025.01.140
Outline
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In an occupied enclosure space formed by multiple opposing jet outlets, understanding vortex structures is crucial in controlling the spread of viruses and pollutants. In this study, a scaled model of an occupied enclosed space with opposing jet flows was constructed by incorporating a heated floor as a heat source to create thermal plumes under cooling conditions. A particle image velocimetry (PIV) system was employed to measure the flow field under isothermal and cooling conditions. The identification performance of different vortex identification algorithms was compared by studying the turbulent characteristics of the flow field from the perspective of the vortex. The Liutex vortex identification method was applied to analyze the vortex motion within one oscillation period, revealing distinct strengths in counterclockwise and clockwise directions, with maximum intensities of 50 s-1 and 110 s-1, respectively. The study concluded that the motion, merging, and annihilation of vortices influenced the flow field structure with a jet oscillation period of approximately 3.67 s. Owing to the trapping effect of vortices on pollutants, areas of pollutant accumulation can be represented using relative frenquency distribution maps of vortex cores. Despite the unsteady flow field, the vortex distribution remained relatively stable. Specifically, on the left side of the CS4 cross-section, the vortex core appeared at the same point up to 21 times. Under cooling conditions, pollutants are confined to smaller regions, which aids in containing the spread of pollutants.

Haoyang Lu, Congcong Wang, Hongbing Chen, Yan Zhang, Chunyang Li, Yuhang Liu, Liguo Zhao. Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure[J]. Journal of Refrigeration, 2025 , 46 (1) : 140 -149 . DOI: 10.12465/j.issn.0253-4339.2025.01.140
Funding
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  • Beijing Science and Technology Project(Z231100006123014)
  • Beijing Municipal Committee Organization Department Youth Backbone Talent Program(24269220005)
Appendix
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Year 2025 volume 46 Issue 1
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Article Info
doi: 10.12465/j.issn.0253-4339.2025.01.140
  • Receive Date：2023-10-27
  • Online Date：2026-03-13
  • Published：2025-02-16
Article Data
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History
  • Received：2023-10-27
  • Revised：2023-12-17
  • Accepted：2024-01-16
Funding
Beijing Science and Technology Project(Z231100006123014)
Beijing Municipal Committee Organization Department Youth Backbone Talent Program(24269220005)
Affiliations
    1.School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 102616, China
    2.Beijing High Strength Concrete Co., Ltd., Beijing, 100071, China

Corresponding:

Wang Congcong, male, lecturer, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, 86-18222202285, E-mail: . Research fields: indoor environmental quality and green energy in buildings.
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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